CN206135852U - Double mode tunable plural IF filter of low -power consumption - Google Patents
Double mode tunable plural IF filter of low -power consumption Download PDFInfo
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- CN206135852U CN206135852U CN201621186194.XU CN201621186194U CN206135852U CN 206135852 U CN206135852 U CN 206135852U CN 201621186194 U CN201621186194 U CN 201621186194U CN 206135852 U CN206135852 U CN 206135852U
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Abstract
The utility model discloses a double mode tunable plural IF filter of low -power consumption comprises bias circuit, the mixed tuning circuit of digifax and plural intermediate frequency filter circuit, plural number intermediate frequency filter circuit is cascaded by the plural number of the second order more than 2 filter circuit and forms, bias circuit provides offset voltage for plural intermediate frequency filter circuit summation mode mixing tuning circuit, the control end that tuning circuit produced a voltage control signal that changes along with the change of internal resistance value, this voltage control signal connection plural number intermediate frequency filter circuit is mixed to the digifax to reach and carry out harmonious mesh to plural intermediate frequency filter circuit. The utility model discloses when providing intermediate frequency filtering function, through plus switching signal realize the switching of two kinds of modes, simultaneously, can go on harmoniously effectively to integrated circuit's the passive component's that the manufacture craft leaded to error, whole chip consumption is only for the 1.5mW left and right sides.
Description
Technical field
This utility model is related to wave filter technology field, and in particular to a kind of double mode tunable complex intermediate frequency filter of low-power consumption
Ripple device.
Background technology
The design and realization of rf analog front-end in wireless communication system is one of key technology, the collection of rf analog front-end
Cheng Du, performance and cost directly affect the success or failure of whole wireless communication system.Radio-frequency front-end is exactly whole wireless receipts
The subsystem of the machine of sending out, performance influences each other between the digital baseband part and rf analog front-end of transceiver.With microelectronics skill
The continuous development of art, convergence is ripe for receiver technology, some new characteristics such as low-power consumption, multi-mode, it is configurable the features such as
Also gradually considered by people.The realization of these functions and receiver intermediate-frequency filter are inseparable, so as to the property to wave filter
New requirement can be proposed with index.
Utility model content
This utility model provides a kind of low-power consumption double mode tunable complex intermediate frequency wave filter, and the circuit can provide intermediate frequency
While filter function, the switching of both of which is realized by additional switching signal；Meanwhile, the making of integrated circuit can be directed to
Technique caused by the error of passive device effectively tuned, whole chip power-consumption is only 1.5mW or so.
To solve the above problems, this utility model is achieved through the following technical solutions：
A kind of double mode tunable complex intermediate frequency wave filter of low-power consumption, including filtering body, the filtering body by
Biasing circuit, numerical model analysis tuning circuit and complex intermediate frequency filter circuit composition；Complex intermediate frequency filter circuit by more than 2 two
Rank complex filter circuits cascading is formed；The input of wherein first order second-order complex filter circuit is the input of filtering body
End, the input of afterbody second-order complex filter circuit is the outfan of filtering body, previous stage second-order complex filtered electrical
The outfan on road connects the input of rear stage second-order complex filter circuit；Biasing circuit and complex intermediate frequency filter circuit and digital-to-analogue
Hybrid tuning circuit is connected；Biasing circuit is that complex intermediate frequency filter circuit and digital-to-analogue hybrid tuning circuit provide bias voltage；Number
The external DC reference voltage of mould hybrid tuning circuit, the outfan connection complex intermediate frequency filter circuit of numerical model analysis tuning circuit
Control end；Numerical model analysis tuning circuit produces a voltage control signal changed with the change of internal resistance value, the voltage
Control signal accesses the control end of complex intermediate frequency filter circuit, to reach the purpose being tuned to complex intermediate frequency filter circuit.
In such scheme, each second-order complex filter circuit includes cascade operational amplifier OPA1-OPA4, resistance
RI1-RI4, resistance RQT1-RQT8, resistance RQ1-RQ4, resistance RW1-RW8, resistance RW_1-RW_8, resistance RC1-RC8, resistance
RC_1-RC_8, filter capacitor array VC1-VC8, and metal-oxide-semiconductor SW1-SW16；Cascade operational amplifier OPA1-OPA4's
Power end connects the outfan of biasing circuit；One end of resistance RI1 is the just defeated of the in-phase input end of second-order complex filter circuit
Enter pole Vini, the other end accesses the positive input of cascade operational amplifier OPA1；One end of resistance RI2 is second-order complex
Negative input pole Vinib in the in-phase input end of filter circuit, the other end accesses the negative defeated of cascade operational amplifier OPA1
Enter end；The negative output terminal of cascade operational amplifier OPA2 is the positive pole of the in-phase output end of second-order complex filter circuit
Vouti；The positive output end of cascade operational amplifier OPA2 is the negative pole of the in-phase output end of second-order complex filter circuit
Voutib；Resistance RQT1 and filter capacitor array VC1 connects, the other end connection cascade operational amplifier of resistance RQT1
The positive input terminal of OPA1, the other end of filter capacitor array VC1 connects the negative output terminal of cascade operational amplifier OPA1；Electricity
One end of resistance RQ1 is connected with the positive input terminal of cascade operational amplifier OPA1, the other end and cascade operational amplifier
The negative output terminal of OPA1 is connected；Resistance RQT2 and filter capacitor array VC2 connects, the other end connection cascade of resistance RQT2
The negative input end of operational amplifier OPA1, the other end connection cascade operational amplifier OPA1's of filter capacitor array VC2
Positive output end；One end of resistance RQ2 is connected with the negative input end of cascade operational amplifier OPA1, the other end and cascade
The positive output end of operational amplifier OPA1 is connected；Resistance RQT5 and filter capacitor array VC5 connects, and the other end of resistance RQT5 connects
The positive input terminal of cascade operational amplifier OPA2 is connect, the other end connection cascade computing of filter capacitor array VC5 is put
The positive output end of big device OPA2；Resistance RQT6 and filter capacitor array VC6 connects, the other end connection cascade of resistance RQT6
The negative input end of operational amplifier OPA2, the other end connection cascade operational amplifier OPA2's of filter capacitor array VC6
Negative output terminal；Resistance RW2 and resistance RW_2 connects, and the other end connection cascade operational amplifier OPA1's of resistance RW2 is negative
Outfan, the other end of resistance RW_2 connects the positive input terminal of cascade operational amplifier OPA2；Metal-oxide-semiconductor SW2 and resistance RW_
2 is in parallel；Resistance RW3 and resistance RW_3 connects, and the other end of resistance RW3 connects the positive output of cascade operational amplifier OPA1
End, the other end of resistance RW_3 connects the negative input end of cascade operational amplifier OPA2；Metal-oxide-semiconductor SW3 and resistance RW_3 is simultaneously
Connection；Resistance RW1 and resistance RW_1 connects, and the other end of resistance RW1 connects the positive input terminal of cascade operational amplifier OPA1,
The other end of resistance RW_1 connects the positive output end of cascade operational amplifier OPA2；Metal-oxide-semiconductor SW1 and resistance RW_1 are in parallel；
Resistance RW4 and resistance RW_4 connects, and the other end of resistance RW4 connects the negative input end of cascade operational amplifier OPA1, electricity
The other end of resistance RW_4 connects the negative output terminal of cascade operational amplifier OPA2；SW4 resistance RW_4 is in parallel for metal-oxide-semiconductor；Resistance RI3
One end be second-order complex filter circuit orthorhombic phase input positive pole Vinq, the other end access cascade operational amplifier
The positive input of OPA3；One end of resistance RI4 is the negative input pole in the orthorhombic phase input of second-order complex filter circuit
Viniqb, the other end accesses the negative input end of cascade operational amplifier OPA3；Cascade operational amplifier OPA4's is negative
Outfan is the positive pole Voutq of the orthogonal phase output terminal of second-order complex filter circuit；Cascade operational amplifier OPA4 is just
Outfan is the negative pole Voutqb of the orthogonal phase output terminal of second-order complex filter circuit；Resistance RQT3 and filter capacitor array VC3
Series connection, the other end of resistance RQT3 connects the positive input terminal of cascade operational amplifier OPA3, and filter capacitor array VC3's is another
One end connects the negative output terminal of cascade operational amplifier OPA3；One end of resistance RQ3 and cascade operational amplifier
The positive input terminal of OPA3 is connected, and the other end is connected with the negative output terminal of cascade operational amplifier OPA3；Resistance RQT4 and filter
Ripple capacitor array VC4 connects, and the other end of resistance RQT4 connects the negative input end of cascade operational amplifier OPA3, filtered electrical
The other end for holding array VC4 connects the positive output end of cascade operational amplifier OPA3；One end of resistance RQ4 and cascade
The negative input end of operational amplifier OPA3 is connected, and the other end is connected with the positive output end of cascade operational amplifier OPA3；Electricity
Resistance RQT7 and filter capacitor array VC7 series connection, the other end connection cascade operational amplifier OPA4's of resistance RQT7 is just defeated
Enter end, the other end of filter capacitor array VC7 connects the positive output end of cascade operational amplifier OPA4；Resistance RQT8 and filter
Ripple capacitor array VC8 connects, and the other end of resistance RQT8 connects the negative input end of cascade operational amplifier OPA4, filtered electrical
The other end for holding array VC8 connects the negative output terminal of cascade operational amplifier OPA4；Resistance RW6 and resistance RW_6 connects,
The other end of resistance RW6 connects the negative output terminal of cascade operational amplifier OPA3, the other end connection common source of resistance RW_6
The positive input terminal of common grid operational amplifier OPA4；Metal-oxide-semiconductor SW6 is in parallel with resistance RW_6；Resistance RW7 and resistance RW_7 connects, electricity
The other end of resistance RW7 connects the positive output end of cascade operational amplifier OPA3, and the other end connection common source of resistance RW_7 is total to
The negative input end of grid operational amplifier OPA4；Metal-oxide-semiconductor SW7 is in parallel with resistance RW_7；Resistance RW5 and resistance RW_5 connects, resistance
The other end of RW5 connects the positive input terminal of cascade operational amplifier OPA3, the other end connection cascade of resistance RW_5
The positive output end of operational amplifier OPA4；Metal-oxide-semiconductor SW5 and resistance RW_5 are in parallel；Resistance RW8 and resistance RW_8 connects, resistance RW8
The other end connect the negative input end of cascade operational amplifier OPA3, the other end of resistance RW_8 connects cascade computing and puts
The negative output terminal of big device OPA4；SW8 resistance RW_8 is in parallel for metal-oxide-semiconductor；Resistance RC1 and resistance RC_1 connects, the other end of resistance RC1
The negative input end of connection cascade operational amplifier OPA1, the other end connection cascade operational amplifier of resistance RC_1
The negative output terminal of OPA3；Metal-oxide-semiconductor SW9 and resistance RC_1 are in parallel；Resistance RC2 and resistance RC_2 connects, and the other end of resistance RC2 connects
Meet the positive input terminal of cascade operational amplifier OPA1, the other end connection cascade operational amplifier OPA3 of resistance RC_2
Positive output end；SW10 resistance RC_2 is in parallel for metal-oxide-semiconductor；Resistance RC3 and resistance RC_3 connects, and the other end connection of resistance RC3 is altogether
The positive input terminal of the common grid operational amplifier OPA3 in source, the other end connection cascade operational amplifier OPA1's of resistance RC_3 is negative
Outfan；SW11 resistance RC_3 is in parallel for metal-oxide-semiconductor；Resistance RC4 and resistance RC_4 connects, and the other end connection common source of resistance RC4 is total to
The negative input end of grid operational amplifier OPA3, the other end of resistance RC_4 connects the positive output of cascade operational amplifier OPA1
End；SW12 resistance RC_4 is in parallel for metal-oxide-semiconductor；Resistance RC5 and resistance RC_5 connects, the other end connection cascade fortune of resistance RC5
The negative input end of amplifier OPA2 is calculated, the other end of resistance RC_5 connects the negative output terminal of cascade operational amplifier OPA4；
SW13 resistance RC_5 is in parallel for metal-oxide-semiconductor；Resistance RC6 and resistance RC_6 connects, and the other end connection cascade computing of resistance RC6 is put
The positive input terminal of big device OPA2, the other end of resistance RC_6 connects the positive output end of cascade operational amplifier OPA4；Metal-oxide-semiconductor
SW14 resistance RC_6 is in parallel；Resistance RC7 and resistance RC_7 connects, the other end connection cascade operational amplifier of resistance RC7
The positive input terminal of OPA4, the other end of resistance RC_7 connects the negative output terminal of cascade operational amplifier OPA2；Metal-oxide-semiconductor SW15
Resistance RC_7 is in parallel；Resistance RC8 and resistance RC_8 connects, the other end connection cascade operational amplifier OPA4 of resistance RC8
Negative input end, the other end of resistance RC_8 connects the positive output end of cascade operational amplifier OPA2；Metal-oxide-semiconductor SW16 resistance
RC_8 is in parallel.
In such scheme, the structure of cascade operational amplifier OPA1-OPA4 is identical, and it is by cascade electricity
Road is connected with operational amplification circuit and forms.
In such scheme, numerical model analysis tuning circuit includes analog tuner circuit and digital tuning process module；Its middle mold
Intending tuning circuit includes manostat OPA5, resistance R1-R2, reference resistance Rref, electric capacity C1-C2, metal-oxide-semiconductor M21-M29, tuning electricity
Hold array, and comparator Comp；Resistance R1 and resistance R2 connects, the connected end connection manostat OPA5 of resistance R1 and resistance R2
Positive input terminal, resistance R1 the other end connection power vd D, resistance R2 the other end ground connection；The output termination of manostat OPA5
The grid of metal-oxide-semiconductor M26；The outfan of the one termination manostat OPA5 of electric capacity C1, the leakage of another termination metal-oxide-semiconductor M26 of electric capacity C1
Pole；After the source electrode of metal-oxide-semiconductor M26, reference resistance Rref are connected with electric capacity C2, while being connected to the negative input end of manostat OPA5；
The other end of reference resistance Rref and the other end ground connection of electric capacity C2；The grid of metal-oxide-semiconductor M22 and the grid of metal-oxide-semiconductor M23 connect simultaneously
Connect the drain electrode of metal-oxide-semiconductor M26；The grid of metal-oxide-semiconductor M24 and the grid of metal-oxide-semiconductor M25 connect biasing circuit simultaneously；The leakage of metal-oxide-semiconductor M24
Pole connects the drain electrode of metal-oxide-semiconductor M26；The source electrode of the drain electrode connection metal-oxide-semiconductor M24 of metal-oxide-semiconductor M22；The source electrode of metal-oxide-semiconductor M22, metal-oxide-semiconductor M23
Source electrode and metal-oxide-semiconductor M21 source electrode connection；The drain electrode of metal-oxide-semiconductor M21 is connected with power vd D；The drain electrode connection MOS of metal-oxide-semiconductor M23
The source electrode of pipe M25；The drain electrode of metal-oxide-semiconductor M25, the drain electrode of metal-oxide-semiconductor M27 are connected with the drain electrode of metal-oxide-semiconductor M28；The grid of metal-oxide-semiconductor M27
Pulse signal CLK1 is met with the grid of metal-oxide-semiconductor M28；The source ground of metal-oxide-semiconductor M27；The source electrode of metal-oxide-semiconductor M28 and metal-oxide-semiconductor M29's
After drain electrode is connected, while connecting one end of tuning capacity array, and it is connected with the negative input end of comparator Comp；Metal-oxide-semiconductor M29's
Grid meets pulse signal CLK2；The source ground of metal-oxide-semiconductor M29；The external DC reference voltage of positive input terminal of comparator Comp
Vref；The output of comparator Comp connects the input of digital tuning processing module；3 outfans of digital tuning processing module point
Not Lian Jie tuning capacity array the other end, the control end of filter capacitor array, and the grid of metal-oxide-semiconductor M21.
In such scheme, manostat OPA5 is made up of cmos operational amplifier.
Compared with prior art, this utility model has following features：
1st, wave filter is built using current multiplexing type cascade operational amplifier, and traditional utilization two-stage calculation amplifies
Device builds wave filter and compares, and while realizing that high gain-bandwidth is accumulated, power consumption is greatly lowered.
2nd, compensation resistance is added on the basis of traditional double TT Structure Filters, to realize the compensation to Q-value, from
And while filter power consumption is not increased, the ripple factor of wave filter is reduced to 0.5dB.
3rd, several switches being made up of metal-oxide-semiconductor are added in wave filter, so as to realize wave filter under two kinds of mode of operations
Switching.
4 compare with the structure of existing tuning circuit, and using low voltage cascade current mirror circuit current replication is improve
Accuracy.
5th, the comparator output after sequence signal detection module is added in digital tuning module to finish to tuning
Value carries out the detection of particular sequence signal, so as to reach a purpose that control signal is generated after tuning process is finished, thus
Substantially reduce the time of tuning process.
Description of the drawings
Fig. 1 is a kind of system block diagram of the double mode tunable complex intermediate frequency wave filter of low-power consumption.
Fig. 2 is the schematic diagram of second-order complex filter circuit.
Fig. 3 is the schematic diagram of operation amplifier circuit (OPA1-OPA4).
Fig. 4 is the schematic diagram of numerical model analysis tuning circuit.
Fig. 5 is the schematic diagram of digital tuning processing module circuit.
Fig. 6 is the flow chart of digital tuning processing module circuit.
Specific embodiment
The double mode tunable complex intermediate frequency wave filter of a kind of low-power consumption, as shown in figure 1, the filtering body is by biased electrical
Road, numerical model analysis tuning circuit and complex intermediate frequency filter circuit composition.Complex intermediate frequency filter circuit is by the second-order complex of more than 2
Filter circuit cascade is formed.The input of wherein first order second-order complex filter circuit is the input of filtering body, most
The input of rear stage second-order complex filter circuit is the outfan of filtering body, previous stage second-order complex filter circuit
Outfan connects the input of rear stage second-order complex filter circuit.In this utility model preferred embodiment, complex intermediate frequency filter
Wave circuit is formed by 2 second-order complex filter circuit cascades.Biasing circuit is tuned with complex intermediate frequency filter circuit and numerical model analysis
Circuit is connected.Biasing circuit is that complex intermediate frequency filter circuit and digital-to-analogue hybrid tuning circuit provide bias voltage.Numerical model analysis are adjusted
The external DC reference voltage Vref of humorous circuit, the outfan of numerical model analysis tuning circuit connects the control of complex intermediate frequency filter circuit
End.Numerical model analysis tuning circuit produces a voltage control signal changed with the change of resistance is internally integrated, the electricity
Pressure control signal accesses the control end of the capacitor array of complex intermediate frequency filter circuit, and complex intermediate frequency filter circuit is carried out with reaching
The purpose of tuning.
Referring to Fig. 2, each second-order complex filter circuit includes cascade operational amplifier OPA1-OPA4, resistance RI1-
RI4, resistance RQT1-RQT8, resistance RQ1-RQ4, resistance RW1-RW8, resistance RW_1-RW_8, resistance RC1-RC8, resistance RC_1-
RC_8, filter capacitor array VC1-VC8, and metal-oxide-semiconductor SW1-SW16.
One end of resistance RI1 is the positive input pole Vini of the in-phase input end of second-order complex filter circuit, and the other end is accessed
The positive input of cascade operational amplifier OPA1.One end of resistance RI2 is the homophase input of second-order complex filter circuit
Negative input pole Vinib in end, the other end accesses the negative input end of cascade operational amplifier OPA1.Cascade computing is put
The negative output terminal of big device OPA2 is the positive pole Vouti of the in-phase output end of second-order complex filter circuit.Cascade operation amplifier
The positive output end of device OPA2 is the negative pole Voutib of the in-phase output end of second-order complex filter circuit.Resistance RQT1 and filter capacitor
Array VC1 connects, and the other end of resistance RQT1 connects the positive input terminal of cascade operational amplifier OPA1, filter capacitor array
The other end of VC1 connects the negative output terminal of cascade operational amplifier OPA1.Put with cascade computing one end of resistance RQ1
The positive input terminal of big device OPA1 is connected, and the other end is connected with the negative output terminal of cascade operational amplifier OPA1.Resistance RQT2
With filter capacitor array VC2 series connection, the negative input end of the other end connection cascade operational amplifier OPA1 of resistance RQT2, filter
The other end of ripple capacitor array VC2 connects the positive output end of cascade operational amplifier OPA1.One end of resistance RQ2 and common source
Altogether the negative input end of grid operational amplifier OPA1 is connected, the positive output end phase of the other end and cascade operational amplifier OPA1
Even.Resistance RQT5 and filter capacitor array VC5 connects, the other end connection cascade operational amplifier OPA2's of resistance RQT5
Positive input terminal, the other end of filter capacitor array VC5 connects the positive output end of cascade operational amplifier OPA2.Resistance RQT6
With filter capacitor array VC6 series connection, the negative input end of the other end connection cascade operational amplifier OPA2 of resistance RQT6, filter
The other end of ripple capacitor array VC6 connects the negative output terminal of cascade operational amplifier OPA2.Resistance RW2 and resistance RW_2 goes here and there
Connection, the other end of resistance RW2 connects the negative output terminal of cascade operational amplifier OPA1, and the other end connection of resistance RW_2 is altogether
The positive input terminal of the common grid operational amplifier OPA2 in source.Metal-oxide-semiconductor SW2 is in parallel with resistance RW_2.Resistance RW3 and resistance RW_3 connects,
The other end of resistance RW3 connects the positive output end of cascade operational amplifier OPA1, the other end connection common source of resistance RW_3
The negative input end of common grid operational amplifier OPA2.Metal-oxide-semiconductor SW3 is in parallel with resistance RW_3.Resistance RW1 and resistance RW_1 connects, electricity
The other end of resistance RW1 connects the positive input terminal of cascade operational amplifier OPA1, and the other end connection common source of resistance RW_1 is total to
The positive output end of grid operational amplifier OPA2.Metal-oxide-semiconductor SW1 and resistance RW_1 are in parallel.Resistance RW4 and resistance RW_4 connects, resistance
The other end of RW4 connects the negative input end of cascade operational amplifier OPA1, and the other end of resistance RW_4 connects cascade fortune
Calculate the negative output terminal of amplifier OPA2.SW4 resistance RW_4 is in parallel for metal-oxide-semiconductor.Foregoing circuit constitutes in-phase signal path low-pass filtering
Device.
One end of resistance RI3 is the positive pole Vinq of the orthorhombic phase input of second-order complex filter circuit, and the other end is accessed altogether
The positive input of the common grid operational amplifier OPA3 in source.One end of resistance RI4 is the orthorhombic phase input of second-order complex filter circuit
Negative input pole Viniqb in end, the other end accesses the negative input end of cascade operational amplifier OPA3.Cascade computing
The negative output terminal of amplifier OPA4 is the positive pole Voutq of the orthogonal phase output terminal of second-order complex filter circuit.Cascade computing
The positive output end of amplifier OPA4 is the negative pole Voutqb of the orthogonal phase output terminal of second-order complex filter circuit.Resistance RQT3 and filter
Ripple capacitor array VC3 connects, and the other end of resistance RQT3 connects the positive input terminal of cascade operational amplifier OPA3, filtered electrical
The other end for holding array VC3 connects the negative output terminal of cascade operational amplifier OPA3.One end of resistance RQ3 and cascade
The positive input terminal of operational amplifier OPA3 is connected, and the other end is connected with the negative output terminal of cascade operational amplifier OPA3.Electricity
Resistance RQT4 and filter capacitor array VC4 series connection, the other end connection cascade operational amplifier OPA3's of resistance RQT4 is negative defeated
Enter end, the other end of filter capacitor array VC4 connects the positive output end of cascade operational amplifier OPA3.The one of resistance RQ4
End is connected with the negative input end of cascade operational amplifier OPA3, and the other end and cascade operational amplifier OPA3's is just defeated
Go out end to be connected.Resistance RQT7 and filter capacitor array VC7 connects, the other end connection cascade operational amplifier of resistance RQT7
The positive input terminal of OPA4, the other end of filter capacitor array VC7 connects the positive output end of cascade operational amplifier OPA4.Electricity
Resistance RQT8 and filter capacitor array VC8 series connection, the other end connection cascade operational amplifier OPA4's of resistance RQT8 is negative defeated
Enter end, the other end of filter capacitor array VC8 connects the negative output terminal of cascade operational amplifier OPA4.Resistance RW6 and electricity
Resistance RW_6 series connection, the other end of resistance RW6 connects the negative output terminal of cascade operational amplifier OPA3, and resistance RW_6's is another
The positive input terminal of end connection cascade operational amplifier OPA4.Metal-oxide-semiconductor SW6 is in parallel with resistance RW_6.Resistance RW7 and resistance
RW_7 connects, and the other end of resistance RW7 connects the positive output end of cascade operational amplifier OPA3, the other end of resistance RW_7
The negative input end of connection cascade operational amplifier OPA4.Metal-oxide-semiconductor SW7 is in parallel with resistance RW_7.Resistance RW5 and resistance RW_5
Series connection, the other end of resistance RW5 connects the positive input terminal of cascade operational amplifier OPA3, the other end connection of resistance RW_5
The positive output end of cascade operational amplifier OPA4.Metal-oxide-semiconductor SW5 and resistance RW_5 are in parallel.Resistance RW8 and resistance RW_8 goes here and there
Connection, the other end of resistance RW8 connects the negative input end of cascade operational amplifier OPA3, and the other end of resistance RW_8 connects common source
The negative output terminal of common grid operational amplifier OPA4.SW8 resistance RW_8 is in parallel for metal-oxide-semiconductor.It is low that foregoing circuit constitutes orthogonal signal channel
Bandpass filter.
Resistance RC1 and resistance RC_1 connects, and the other end connection cascade operational amplifier OPA1's of resistance RC1 is negative defeated
Enter end, the other end of resistance RC_1 connects the negative output terminal of cascade operational amplifier OPA3.Metal-oxide-semiconductor SW9 and resistance RC_1
It is in parallel.Resistance RC2 and resistance RC_2 connects, and the other end of resistance RC2 connects the positive input of cascade operational amplifier OPA1
End, the other end of resistance RC_2 connects the positive output end of cascade operational amplifier OPA3.Metal-oxide-semiconductor SW10 resistance RC_2 is simultaneously
Connection.Resistance RC3 and resistance RC_3 connects, and the other end of resistance RC3 connects the positive input terminal of cascade operational amplifier OPA3,
The other end of resistance RC_3 connects the negative output terminal of cascade operational amplifier OPA1.SW11 resistance RC_3 is in parallel for metal-oxide-semiconductor.Electricity
Resistance RC4 and resistance RC_4 series connection, the other end of resistance RC4 connects the negative input end of cascade operational amplifier OPA3, resistance
The other end of RC_4 connects the positive output end of cascade operational amplifier OPA1.SW12 resistance RC_4 is in parallel for metal-oxide-semiconductor.Resistance
RC5 and resistance RC_5 connects, and the other end of resistance RC5 connects the negative input end of cascade operational amplifier OPA2, resistance RC_
5 other end connects the negative output terminal of cascade operational amplifier OPA4.SW13 resistance RC_5 is in parallel for metal-oxide-semiconductor.Resistance RC6 and
Resistance RC_6 connects, and the other end of resistance RC6 connects the positive input terminal of cascade operational amplifier OPA2, and resistance RC_6's is another
One end connects the positive output end of cascade operational amplifier OPA4.SW14 resistance RC_6 is in parallel for metal-oxide-semiconductor.Resistance RC7 and resistance
RC_7 connects, and the other end of resistance RC7 connects the positive input terminal of cascade operational amplifier OPA4, the other end of resistance RC_7
The negative output terminal of connection cascade operational amplifier OPA2.SW15 resistance RC_7 is in parallel for metal-oxide-semiconductor.Resistance RC8 and resistance RC_8
Series connection, the other end of resistance RC8 connects the negative input end of cascade operational amplifier OPA4, the other end connection of resistance RC_8
The positive output end of cascade operational amplifier OPA2.SW16 resistance RC_8 is in parallel for metal-oxide-semiconductor.The effect of foregoing circuit is low by 2
Bandpass filter is connected, and realizes moving on frequency spectrum, and the amplitude-frequency characteristic of wave filter is limited in positive frequency or negative frequency.
The power end of cascade operational amplifier OPA1-OPA4 connects the outfan of biasing circuit.Resistance RQT1-RQT8
For compensation due to the lifting of the caused Q-value of the not enough institute of filter bandwidht.Metal-oxide-semiconductor SW1-SW16 is used to realize wave filter at two kinds
Different mid frequencyes and bandwidth are switched over, and metal-oxide-semiconductor SW1-SW16 is operated under linear zone.
Referring to Fig. 3, the structure of cascade operational amplifier OPA1-OPA4 is identical, and it is by cascode amplifier
It is connected with operational amplification circuit and forms.Metal-oxide-semiconductor M1a is connected with the grid of M1b with the input anode of operational amplifier, connection fortune
Calculate the positive pole Vinp of amplifier input voltage signal.The grid of metal-oxide-semiconductor M2a and M2b and the input cathode phase of operational amplifier
Even, the negative pole Vinn of input voltage signal is connected.The source electrode of metal-oxide-semiconductor M1a, M1b, M2a, M2b is connected and is ultimately connected to electric current
The drain electrode of source M0.The bias voltage Vbp1 that metal-oxide-semiconductor M0 is produced as current source, its grid connection biasing circuit, metal-oxide-semiconductor M0's
Source electrode connects power vd D.The drain electrode of metal-oxide-semiconductor M11 connects the drain electrode of metal-oxide-semiconductor M2b.The leakage of the drain electrode connection metal-oxide-semiconductor M1b of metal-oxide-semiconductor M12
Pole, while metal-oxide-semiconductor M11 is connected with the grid of metal-oxide-semiconductor M12 and connects by the bias voltage Vbn2 of biasing circuit generation.Metal-oxide-semiconductor
The source electrode of M11 connects the drain electrode of metal-oxide-semiconductor M3b.The drain electrode of the drain electrode connection metal-oxide-semiconductor M3a of metal-oxide-semiconductor M1a.Metal-oxide-semiconductor M3a's and M3b
Grid is connected, while connecting the drain electrode of M11.It is K that metal-oxide-semiconductor M3a and metal-oxide-semiconductor M3b forms the ratio of a pair of electric currents：1 current mirror.
The source electrode of metal-oxide-semiconductor M12 connects the drain electrode of metal-oxide-semiconductor M4b.The drain electrode of the drain electrode connection metal-oxide-semiconductor M4a of metal-oxide-semiconductor M2a.Metal-oxide-semiconductor M4a and
The grid of M4b is connected, while connecting the drain electrode of metal-oxide-semiconductor M12.It is K that metal-oxide-semiconductor M4a and metal-oxide-semiconductor M4b forms the ratio of a pair of electric currents：1
Current mirror.The source electrode of metal-oxide-semiconductor M5 is connected with the drain electrode of metal-oxide-semiconductor M3a.The source electrode of metal-oxide-semiconductor M6 is connected with the drain electrode of metal-oxide-semiconductor M4a,
Simultaneously metal-oxide-semiconductor M5 is connected with the grid of metal-oxide-semiconductor M6, and is connected to the bias voltage Vbn2 of biasing circuit generation.The source of metal-oxide-semiconductor M9
Pole is connected with the source electrode of metal-oxide-semiconductor M10 and connects power vd D.The drain electrode of metal-oxide-semiconductor M9 and the drain electrode of metal-oxide-semiconductor M10 connect respectively MOS
The source electrode of pipe M7 and the source electrode of metal-oxide-semiconductor M8.Metal-oxide-semiconductor M7, metal-oxide-semiconductor M8, metal-oxide-semiconductor M9, metal-oxide-semiconductor M10 constitute cascode current source.
The drain electrode of metal-oxide-semiconductor M7 be connected with the drain electrode of metal-oxide-semiconductor M5 and concatenation operation amplifier negative output terminal Voutn.The drain electrode of metal-oxide-semiconductor M8
Be connected with the drain electrode of metal-oxide-semiconductor M6 and concatenation operation amplifier positive output end Voutp.The grid phase of metal-oxide-semiconductor M7 and metal-oxide-semiconductor M8
Even, while connecting the bias voltage Vbp2 produced by biasing circuit.Metal-oxide-semiconductor M5 is connected with the grid of metal-oxide-semiconductor M6, and connects by inclined
The bias voltage Vbn2 that circuits are produced.Metal-oxide-semiconductor M3a, metal-oxide-semiconductor M4a, metal-oxide-semiconductor M5, metal-oxide-semiconductor M6 constitute common source and common grid amplifier.
Metal-oxide-semiconductor M13 and metal-oxide-semiconductor M16 distinguishes the positive output end Voutp and negative output terminal Voutn of concatenation operation amplifier, for detecting unit
Calculate amplifier output signal.Metal-oxide-semiconductor M14 is connected with the grid of metal-oxide-semiconductor M15 and connects biasing circuit VCM.The source electrode of metal-oxide-semiconductor M13
It is connected with the source electrode of metal-oxide-semiconductor M14, while connecting the drain electrode of metal-oxide-semiconductor M17.Metal-oxide-semiconductor M15 is connected with the source electrode of metal-oxide-semiconductor M16, while
The drain electrode of connection metal-oxide-semiconductor M18.The drain electrode of metal-oxide-semiconductor M13 is connected with the drain electrode of metal-oxide-semiconductor M16.The drain electrode of metal-oxide-semiconductor M14 and metal-oxide-semiconductor
The drain electrode of M15 is connected.Metal-oxide-semiconductor M17 is connected with the grid of metal-oxide-semiconductor M18, while the bias voltage that connection is produced by biasing circuit
Vbn3.Metal-oxide-semiconductor M17 is connected and is grounded with the source electrode of metal-oxide-semiconductor M18.Metal-oxide-semiconductor M20 grids are connected with drain electrode, while connecting metal-oxide-semiconductor
The drain electrode of M16.The drain and gate of metal-oxide-semiconductor M19 is connected and output common mode feedback signal is to metal-oxide-semiconductor M9 and the grid of metal-oxide-semiconductor M10
Pole, while the source electrode of the M19 of metal-oxide-semiconductor is connected with the source electrode of metal-oxide-semiconductor M20 and is connected to power vd D.
Above-mentioned metal-oxide-semiconductor M1a, metal-oxide-semiconductor M1b, metal-oxide-semiconductor M2a, metal-oxide-semiconductor M2b, metal-oxide-semiconductor M7, metal-oxide-semiconductor M8, metal-oxide-semiconductor M9, metal-oxide-semiconductor
M10, metal-oxide-semiconductor M19, metal-oxide-semiconductor M20 are PMOSMOS pipes.Metal-oxide-semiconductor M3a, metal-oxide-semiconductor M3b, metal-oxide-semiconductor M4a, metal-oxide-semiconductor M4b, metal-oxide-semiconductor
M5, metal-oxide-semiconductor M6, metal-oxide-semiconductor M11, metal-oxide-semiconductor M12, metal-oxide-semiconductor M13, metal-oxide-semiconductor M14, metal-oxide-semiconductor M15, metal-oxide-semiconductor M16, metal-oxide-semiconductor M17, MOS
Pipe M18 is NMOSMOS pipes.Above-mentioned metal-oxide-semiconductor M0, metal-oxide-semiconductor M1a, metal-oxide-semiconductor M1b, metal-oxide-semiconductor M2a, metal-oxide-semiconductor M2b, metal-oxide-semiconductor M3a, MOS
Pipe M3b, metal-oxide-semiconductor M4a, metal-oxide-semiconductor M4b, metal-oxide-semiconductor M5-M18 is operated in saturation region.
The value of passive device can occur larger deviation so as to cause in order to solve the manufacture process due to integrated circuit
The problem that filter centre frequency and bandwidth can have a greater change, this utility model devises one for automatically adjusting filtering
Capacitance in device is such that it is able to correction wave filter mid frequency and the numerical model analysis tuning circuit of bandwidth.Referring to Fig. 4, digital-to-analogue is mixed
Closing tuning circuit includes analog tuner circuit and digital tuning process module.Wherein analog tuner circuit includes manostat OPA5,
Resistance R1-R2, reference resistance Rref, electric capacity C1-C2, metal-oxide-semiconductor M21-M29, tuning capacity array, and comparator Comp.Its
Middle manostat OPA5 is made up of cmos operational amplifier.Resistance R1 and resistance R2 connects, and the connected end of resistance R1 and resistance R2 connects
Connect the positive input terminal of manostat OPA5, the other end connection power vd D of resistance R1, the other end ground connection of resistance R2.Manostat
The grid of the output termination metal-oxide-semiconductor M26 of OPA5.The outfan of the one termination manostat OPA5 of electric capacity C1, the other end of electric capacity C1
Connect the drain electrode of metal-oxide-semiconductor M26.After the source electrode of metal-oxide-semiconductor M26, reference resistance Rref are connected with electric capacity C2, while being connected to manostat
The negative input end of OPA5.The other end of reference resistance Rref and the other end ground connection of electric capacity C2.The grid and metal-oxide-semiconductor of metal-oxide-semiconductor M22
The grid of M23 connects the drain electrode of metal-oxide-semiconductor M26 simultaneously.The grid of metal-oxide-semiconductor M24 and the grid of metal-oxide-semiconductor M25 connect biased electrical simultaneously
Road.The drain electrode of the drain electrode connection metal-oxide-semiconductor M26 of metal-oxide-semiconductor M24.The source electrode of the drain electrode connection metal-oxide-semiconductor M24 of metal-oxide-semiconductor M22.Metal-oxide-semiconductor M22
Source electrode, the source electrode of metal-oxide-semiconductor M23 and metal-oxide-semiconductor M21 source electrode connection.The drain electrode of metal-oxide-semiconductor M21 is connected with power vd D.Metal-oxide-semiconductor
The source electrode of the drain electrode connection metal-oxide-semiconductor M25 of M23.The drain electrode phase of the drain electrode, the drain electrode of metal-oxide-semiconductor M27 and metal-oxide-semiconductor M28 of metal-oxide-semiconductor M25
Even.The grid of metal-oxide-semiconductor M27 and the grid of metal-oxide-semiconductor M28 meet pulse signal CLK1.The source ground of metal-oxide-semiconductor M27.Metal-oxide-semiconductor M28's
After source electrode is connected with the drain electrode of metal-oxide-semiconductor M29, at the same connect tuning capacity array one end, and with the negative input of comparator Comp
End is connected.The grid of metal-oxide-semiconductor M29 meets pulse signal CLK2.The source ground of metal-oxide-semiconductor M29.Outside the positive input terminal of comparator Comp
Meet DC reference voltage Vref.The output of comparator Comp connects the input of digital tuning processing module.Digital tuning processes mould
3 outfans of block connect respectively the other end of tuning capacity array, the control end of filter capacitor array, and metal-oxide-semiconductor M21
Grid.
Above-mentioned metal-oxide-semiconductor M22, metal-oxide-semiconductor M23, metal-oxide-semiconductor M24, metal-oxide-semiconductor M25 are PMOSMOS pipes.Metal-oxide-semiconductor M21, metal-oxide-semiconductor M26,
Metal-oxide-semiconductor M27, metal-oxide-semiconductor M28, metal-oxide-semiconductor M29, metal-oxide-semiconductor M30, metal-oxide-semiconductor M31, metal-oxide-semiconductor M32, metal-oxide-semiconductor M33, metal-oxide-semiconductor M34 are
NMOSMOS is managed.Metal-oxide-semiconductor M21, metal-oxide-semiconductor M22, metal-oxide-semiconductor M23, metal-oxide-semiconductor M24, metal-oxide-semiconductor M25, metal-oxide-semiconductor M26 are operationally in full
And area, cut-off region is in after tuning process is finished.Metal-oxide-semiconductor M27, metal-oxide-semiconductor M28, the working condition of metal-oxide-semiconductor M29 are believed by pulse
Number CLK1 and CLK2 is determined.Metal-oxide-semiconductor M30, metal-oxide-semiconductor M31, metal-oxide-semiconductor M32, metal-oxide-semiconductor M33, metal-oxide-semiconductor M34 are in linear work area.
The operation principle of analog tuner circuit is：Using the partial pressure produced by resistance R1 and resistance R2, it is input into manostat
The positive input terminal of OPA5.A feedback loop is formed using manostat OPA5, and resistance Rref and electric capacity C1 and electric capacity C2,
So as to allow the electric current of input to metal-oxide-semiconductor M22, metal-oxide-semiconductor M24 branch roads to remain constant.Will using a low voltage cascade current mirror
Electric current is filled with capacitor array.Periodic discharge and recharge is carried out to electric capacity by applying pulse signal CLK1 and CLK2, so as to allow electricity
The change of stream is converted into the change of voltage.Input voltage is compared with reference voltage Vref by voltage comparator.And will compare
It is input into digital tuning modular circuit compared with the result of device and is processed.
Digital tuning processing module is used to for the output of comparator to make corresponding process, and produces the tuning capacity of 5
Array control signal, the filter capacitor array control signal of 5, while producing Con Signal signal outputs to metal-oxide-semiconductor M21's
Grid is used to cut off current source to reach the purpose for saving power consumption.That is, 3 outfans of digital tuning processing module point
Not Lian Jie tuning capacity array control end, the control end of filter capacitor array, and the grid of metal-oxide-semiconductor M21.
Digital tuning processing module, as shown in figure 5, circuit include 1 d type flip flop DFF, 1 decoder Encoder, 1
5 full adder ADDER, 1 with five bit register 5BREGA, 1 five bit register 5BREGB, 1 sequence for putting several functions
Signal detector SEQDEC, 1 clock generation circuit and 1 electrification reset circuit.The comparator Comp's of tuning circuit is defeated
Go out to be connected to the input D of d type flip flop DFF, the outfan Q of d type flip flop DFF meets the input A of decoder Encoder.Decoder
The output of Encoder is connected to one end input B of full adder ADDER.Full adder ADDER will export A<4:0>Feedback inserts full adder
The input A ends of ADDER.Output is connected to the input that can put several 5 bit register 5BREGA simultaneously.Several 5 bit registers can be put
The output of 5BREGA is connected to the input of 5 bit register 5BREGB.The input C of Sequence Signal Detector SEQDEC meets D and touches
Send out the outfan Q of device, the clock end Clk of output 5 bit register 5BREGB of termination.The outfan Clkg of clock generating circuit meets D
The clock end Clk of the trigger DFF and clock end Clk of Sequence Signal Detector SEQDEC.The outfan of reset circuit REST
Reset connect can put several 5 bit register 5BREG put several end Reset.
The operation principle of digital tuning processing module is：After circuit electrification reset, number is put in the output of depositor 5BREGA
For 10000, in order to allow the value of initial capacitance to be placed in the position of total capacitance value half, so as to allow the speed of tuning to accelerate.
Subsequently comparator Comp and decoder Encoder starts working, and it is pre- to judge whether the result after the computing of adder ADDER is equal to
If value, if more than presetting value, adding one by five control codes, if less than presetting value, by five control routines
Subtract one.If compare finishing, the output of comparator comp can hover in high level 1 and low level 0.In Sequence Signal Detector detection
To after 3 groups of low and high level changes, numerical model analysis tuning circuit meeting output control signal Con Signal closes tuning circuit, and
Final capacitor array control code is exported to senior filter capacitor array.Must be with 2 with currentnThe power cycle could most
The scheme of whole output capacitance control array is compared, and the method greatly shortens the time of regulation.Referring to Fig. 6.
Claims (5)
1. a kind of double mode tunable complex intermediate frequency wave filter of low-power consumption, including filtering body, it is characterised in that：The filtering
Device body is made up of biasing circuit, numerical model analysis tuning circuit and complex intermediate frequency filter circuit；
Complex intermediate frequency filter circuit is formed by the second-order complex filter circuit cascade of more than 2；Wherein first order second-order complex filter
The input of wave circuit is the input of filtering body, and the input of afterbody second-order complex filter circuit is wave filter sheet
The outfan of body, the outfan of previous stage second-order complex filter circuit connects the input of rear stage second-order complex filter circuit；
Biasing circuit is connected with complex intermediate frequency filter circuit and digital-to-analogue hybrid tuning circuit；Biasing circuit is complex intermediate frequency filtered electrical
Road and digital-to-analogue hybrid tuning circuit provide bias voltage；
The external DC reference voltage of numerical model analysis tuning circuit, the outfan connection complex intermediate frequency filtering of numerical model analysis tuning circuit
The control end of circuit；Numerical model analysis tuning circuit produces a voltage control signal changed with the change of internal resistance value,
The voltage control signal accesses the control end of complex intermediate frequency filter circuit, to reach what complex intermediate frequency filter circuit was tuned
Purpose.
2. the double mode tunable complex intermediate frequency wave filter of a kind of low-power consumption according to claim 1, it is characterised in that：
Each second-order complex filter circuit includes cascade operational amplifier OPA1-OPA4, resistance RI1-RI4, resistance RQT1-
RQT8, resistance RQ1-RQ4, resistance RW1-RW8, resistance RW_1-RW_8, resistance RC1-RC8, resistance RC_1-RC_8, filter capacitor
Array VC1-VC8, and metal-oxide-semiconductor SW1-SW16；
The power end of cascade operational amplifier OPA1-OPA4 connects the outfan of biasing circuit；
One end of resistance RI1 is the positive input pole Vini of the in-phase input end of second-order complex filter circuit, and the other end accesses common source
The positive input of common grid operational amplifier OPA1；One end of resistance RI2 is in the in-phase input end of second-order complex filter circuit
Negative input pole Vinib, the other end access cascade operational amplifier OPA1 negative input end；Cascade operational amplifier
The negative output terminal of OPA2 is the positive pole Vouti of the in-phase output end of second-order complex filter circuit；Cascade operational amplifier
The positive output end of OPA2 is the negative pole Voutib of the in-phase output end of second-order complex filter circuit；
Resistance RQT1 and filter capacitor array VC1 connects, the other end connection cascade operational amplifier OPA1 of resistance RQT1
Positive input terminal, the other end of filter capacitor array VC1 connects the negative output terminal of cascade operational amplifier OPA1；Resistance
One end of RQ1 is connected with the positive input terminal of cascade operational amplifier OPA1, the other end and cascade operational amplifier
The negative output terminal of OPA1 is connected；Resistance RQT2 and filter capacitor array VC2 connects, the other end connection cascade of resistance RQT2
The negative input end of operational amplifier OPA1, the other end connection cascade operational amplifier OPA1's of filter capacitor array VC2
Positive output end；One end of resistance RQ2 is connected with the negative input end of cascade operational amplifier OPA1, the other end and cascade
The positive output end of operational amplifier OPA1 is connected；
Resistance RQT5 and filter capacitor array VC5 connects, the other end connection cascade operational amplifier OPA2 of resistance RQT5
Positive input terminal, the other end of filter capacitor array VC5 connects the positive output end of cascade operational amplifier OPA2；Resistance
RQT6 and filter capacitor array VC6 connects, and the other end of resistance RQT6 connects the negative input of cascade operational amplifier OPA2
End, the other end of filter capacitor array VC6 connects the negative output terminal of cascade operational amplifier OPA2；
Resistance RW2 and resistance RW_2 connects, and the other end of resistance RW2 connects the negative output of cascade operational amplifier OPA1
End, the other end of resistance RW_2 connects the positive input terminal of cascade operational amplifier OPA2；Metal-oxide-semiconductor SW2 and resistance RW_2 is simultaneously
Connection；Resistance RW3 and resistance RW_3 connects, and the other end of resistance RW3 connects the positive output end of cascade operational amplifier OPA1,
The other end of resistance RW_3 connects the negative input end of cascade operational amplifier OPA2；Metal-oxide-semiconductor SW3 is in parallel with resistance RW_3；
Resistance RW1 and resistance RW_1 connects, and the other end of resistance RW1 connects the positive input of cascade operational amplifier OPA1
End, the other end of resistance RW_1 connects the positive output end of cascade operational amplifier OPA2；Metal-oxide-semiconductor SW1 and resistance RW_1 are simultaneously
Connection；Resistance RW4 and resistance RW_4 connects, and the other end of resistance RW4 connects the negative input end of cascade operational amplifier OPA1,
The other end of resistance RW_4 connects the negative output terminal of cascade operational amplifier OPA2；SW4 resistance RW_4 is in parallel for metal-oxide-semiconductor；
One end of resistance RI3 is the positive pole Vinq of the orthorhombic phase input of second-order complex filter circuit, and the other end accesses common source and is total to
The positive input of grid operational amplifier OPA3；One end of resistance RI4 is in the orthorhombic phase input of second-order complex filter circuit
Negative input pole Viniqb, the other end access cascade operational amplifier OPA3 negative input end；Cascade operation amplifier
The negative output terminal of device OPA4 is the positive pole Voutq of the orthogonal phase output terminal of second-order complex filter circuit；Cascade operation amplifier
The positive output end of device OPA4 is the negative pole Voutqb of the orthogonal phase output terminal of second-order complex filter circuit；
Resistance RQT3 and filter capacitor array VC3 connects, the other end connection cascade operational amplifier OPA3 of resistance RQT3
Positive input terminal, the other end of filter capacitor array VC3 connects the negative output terminal of cascade operational amplifier OPA3；Resistance
One end of RQ3 is connected with the positive input terminal of cascade operational amplifier OPA3, the other end and cascade operational amplifier
The negative output terminal of OPA3 is connected；Resistance RQT4 and filter capacitor array VC4 connects, the other end connection cascade of resistance RQT4
The negative input end of operational amplifier OPA3, the other end connection cascade operational amplifier OPA3's of filter capacitor array VC4
Positive output end；One end of resistance RQ4 is connected with the negative input end of cascade operational amplifier OPA3, the other end and cascade
The positive output end of operational amplifier OPA3 is connected；
Resistance RQT7 and filter capacitor array VC7 connects, the other end connection cascade operational amplifier OPA4 of resistance RQT7
Positive input terminal, the other end of filter capacitor array VC7 connects the positive output end of cascade operational amplifier OPA4；Resistance
RQT8 and filter capacitor array VC8 connects, and the other end of resistance RQT8 connects the negative input of cascade operational amplifier OPA4
End, the other end of filter capacitor array VC8 connects the negative output terminal of cascade operational amplifier OPA4；
Resistance RW6 and resistance RW_6 connects, and the other end of resistance RW6 connects the negative output of cascade operational amplifier OPA3
End, the other end of resistance RW_6 connects the positive input terminal of cascade operational amplifier OPA4；Metal-oxide-semiconductor SW6 and resistance RW_6 is simultaneously
Connection；Resistance RW7 and resistance RW_7 connects, and the other end of resistance RW7 connects the positive output end of cascade operational amplifier OPA3,
The other end of resistance RW_7 connects the negative input end of cascade operational amplifier OPA4；Metal-oxide-semiconductor SW7 is in parallel with resistance RW_7；
Resistance RW5 and resistance RW_5 connects, and the other end of resistance RW5 connects the positive input of cascade operational amplifier OPA3
End, the other end of resistance RW_5 connects the positive output end of cascade operational amplifier OPA4；Metal-oxide-semiconductor SW5 and resistance RW_5 are simultaneously
Connection；Resistance RW8 and resistance RW_8 connects, and the other end of resistance RW8 connects the negative input end of cascade operational amplifier OPA3,
The other end of resistance RW_8 connects the negative output terminal of cascade operational amplifier OPA4；SW8 resistance RW_8 is in parallel for metal-oxide-semiconductor；
Resistance RC1 and resistance RC_1 connects, and the other end of resistance RC1 connects the negative input of cascade operational amplifier OPA1
End, the other end of resistance RC_1 connects the negative output terminal of cascade operational amplifier OPA3；Metal-oxide-semiconductor SW9 and resistance RC_1 are simultaneously
Connection；Resistance RC2 and resistance RC_2 connects, and the other end of resistance RC2 connects the positive input terminal of cascade operational amplifier OPA1,
The other end of resistance RC_2 connects the positive output end of cascade operational amplifier OPA3；SW10 resistance RC_2 is in parallel for metal-oxide-semiconductor；Electricity
Resistance RC3 and resistance RC_3 series connection, the other end of resistance RC3 connects the positive input terminal of cascade operational amplifier OPA3, resistance
The other end of RC_3 connects the negative output terminal of cascade operational amplifier OPA1；SW11 resistance RC_3 is in parallel for metal-oxide-semiconductor；Resistance
RC4 and resistance RC_4 connects, and the other end of resistance RC4 connects the negative input end of cascade operational amplifier OPA3, resistance RC_
4 other end connects the positive output end of cascade operational amplifier OPA1；SW12 resistance RC_4 is in parallel for metal-oxide-semiconductor；
Resistance RC5 and resistance RC_5 connects, and the other end of resistance RC5 connects the negative input of cascade operational amplifier OPA2
End, the other end of resistance RC_5 connects the negative output terminal of cascade operational amplifier OPA4；Metal-oxide-semiconductor SW13 resistance RC_5 is simultaneously
Connection；Resistance RC6 and resistance RC_6 connects, and the other end of resistance RC6 connects the positive input terminal of cascade operational amplifier OPA2,
The other end of resistance RC_6 connects the positive output end of cascade operational amplifier OPA4；SW14 resistance RC_6 is in parallel for metal-oxide-semiconductor；Electricity
Resistance RC7 and resistance RC_7 series connection, the other end of resistance RC7 connects the positive input terminal of cascade operational amplifier OPA4, resistance
The other end of RC_7 connects the negative output terminal of cascade operational amplifier OPA2；SW15 resistance RC_7 is in parallel for metal-oxide-semiconductor；Resistance
RC8 and resistance RC_8 connects, and the other end of resistance RC8 connects the negative input end of cascade operational amplifier OPA4, resistance RC_
8 other end connects the positive output end of cascade operational amplifier OPA2；SW16 resistance RC_8 is in parallel for metal-oxide-semiconductor.
3. the double mode tunable complex intermediate frequency wave filter of a kind of low-power consumption according to claim 2, it is characterised in that：Common source
Altogether the structure of grid operational amplifier OPA1-OPA4 is identical, its be connected with operational amplification circuit by cascode amplifier and
Into.
4. the double mode tunable complex intermediate frequency wave filter of a kind of low-power consumption according to claim 1, it is characterised in that：
Numerical model analysis tuning circuit includes analog tuner circuit and digital tuning process module；Wherein analog tuner circuit includes steady
Depressor OPA5, resistance R1-R2, reference resistance Rref, electric capacity C1-C2, metal-oxide-semiconductor M21-M29, tuning capacity array, and compare
Device Comp；
Resistance R1 and resistance R2 connects, and the connected end of resistance R1 and resistance R2 connects the positive input terminal of manostat OPA5, resistance R1
The other end connection power vd D, resistance R2 the other end ground connection；The grid of the output termination metal-oxide-semiconductor M26 of manostat OPA5；Electricity
Hold the outfan of a termination manostat OPA5 of C1, the drain electrode of another termination metal-oxide-semiconductor M26 of electric capacity C1；
After the source electrode of metal-oxide-semiconductor M26, reference resistance Rref are connected with electric capacity C2, while being connected to the negative input end of manostat OPA5；
The other end of reference resistance Rref and the other end ground connection of electric capacity C2；The grid of metal-oxide-semiconductor M22 and the grid of metal-oxide-semiconductor M23 connect simultaneously
Connect the drain electrode of metal-oxide-semiconductor M26；The grid of metal-oxide-semiconductor M24 and the grid of metal-oxide-semiconductor M25 connect biasing circuit simultaneously；
The drain electrode of the drain electrode connection metal-oxide-semiconductor M26 of metal-oxide-semiconductor M24；The source electrode of the drain electrode connection metal-oxide-semiconductor M24 of metal-oxide-semiconductor M22；Metal-oxide-semiconductor
The source electrode connection of the source electrode, the source electrode of metal-oxide-semiconductor M23 and metal-oxide-semiconductor M21 of M22；The drain electrode of metal-oxide-semiconductor M21 is connected with power vd D；MOS
The source electrode of the drain electrode connection metal-oxide-semiconductor M25 of pipe M23；The drain electrode phase of the drain electrode, the drain electrode of metal-oxide-semiconductor M27 and metal-oxide-semiconductor M28 of metal-oxide-semiconductor M25
Even；The grid of metal-oxide-semiconductor M27 and the grid of metal-oxide-semiconductor M28 meet pulse signal CLK1；The source ground of metal-oxide-semiconductor M27；
After the source electrode of metal-oxide-semiconductor M28 is connected with the drain electrode of metal-oxide-semiconductor M29, while connecting one end of tuning capacity array, and and compare
The negative input end of device Comp is connected；The grid of metal-oxide-semiconductor M29 meets pulse signal CLK2；The source ground of metal-oxide-semiconductor M29；
The external DC reference voltage Vref of positive input terminal of comparator Comp；The output of comparator Comp connects digital tuning and processes mould
The input of block；3 outfans of digital tuning processing module connect respectively the other end of tuning capacity array, filter capacitor battle array
The control end of row, and the grid of metal-oxide-semiconductor M21.
5. the double mode tunable complex intermediate frequency wave filter of a kind of low-power consumption according to claim 4, it is characterised in that：Voltage stabilizing
Device OPA5 is made up of cmos operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201621186194.XU CN206135852U (en) | 2016-10-28 | 2016-10-28 | Double mode tunable plural IF filter of low -power consumption |
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| CN201621186194.XU CN206135852U (en) | 2016-10-28 | 2016-10-28 | Double mode tunable plural IF filter of low -power consumption |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109257028A (en) * | 2018-09-27 | 2019-01-22 | 东南大学 | A kind of low-power consumption plural number double-two-order unit circuit of current multiplexing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109257028A (en) * | 2018-09-27 | 2019-01-22 | 东南大学 | A kind of low-power consumption plural number double-two-order unit circuit of current multiplexing |
| CN109257028B (en) * | 2018-09-27 | 2022-04-15 | 东南大学 | Current multiplexing low-power consumption complex biquad unit circuit |
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