CN102684631B - Reconfigurable filter circuit for realizing plural filters and low-pass filtering - Google Patents
Reconfigurable filter circuit for realizing plural filters and low-pass filtering Download PDFInfo
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Abstract
The invention provides a reconfigurable filter circuit for realizing plural filters and low-pass filtering. The reconfigurable filter circuit is characterized in that a positive electrode input (Iin+) of a first radio frequency signal (I circuit) is connected with one end of a first resistor (R1), the other end of the first resistor (R1) is connected with one end of a second resistor (R2), the positive end of a first capacitor (C1), one end of a second switch (SL2) needing to be switched off when the low-pass filter function is realized, and one end of a third switch (SL3) needing to the switched off when the low-pass filter function is realized; and the other end of the third switch (SL3) needing to be switched off when the low-pass filter function is realized is connected with the negative end of a third capacitor (C3). According to the reconfigurable filter circuit, two filter functions are realized by configuring a hardware circuit, a chip area and the circuit power consumption are reduced greatly, and meanwhile the two-step filter characteristic can be realized by the two operational amplifiers, so that the chip area and the circuit power consumption can be further reduced.
Description
Technical field
The present invention relates to a kind of restructural filter circuit that can realize complex filter and low-pass filtering, be applied to low cost low-power consumption radio frequency reception and send out in movement sheet, can realize by the reconstruct of circuit the low-pass filtering function that plural band-pass filtering function that receiver requires and transmitting chain require according to the requirement of system.The restructural filter proposing is not suitable for narrow-band reception and sends out machine.Complex filter and the low-pass filtering with second-order filter characteristic only can be realized with an operational amplifier in IQMei road, can further reduce system power dissipation and chip area.
Background technology
Constantly reduce in integrated circuit area, under the trend that power consumption constantly reduces, how further to improve circuit performance and become the important subject of current circuit design.The advantages such as Reconfiguration Technologies is owing to having target strong adaptability, and development cost is low, portable, are subject to people and pay close attention to greatly.In current radio frequency system, connect transceiver and much adopt low intermediate frequency structure.In this structure, receiving front-end need to carry out complex filter to signal to be disturbed to reduce mirror image, need to carry out low-pass filtering to signal at transmitting terminal simultaneously.The filtering principle of complex filter, based on real number lowpass filtering theory, can be realized the conversion of complex filter to real number filtering, so there is certain Reconfigurable Theory foundation after shutoff frequency displacement network.The present invention proposes a kind of restructural filter circuit that can realize complex filter and low-pass filtering thus, is applied to low cost low-power consumption radio frequency reception and sends out in movement sheet.
The existing filter connecing in transceiver, mainly there is following point: (1) will design a filter of realizing complex filter at receiving terminal, will design a filter of realizing low-pass filtering at transmitting terminal, two filter power consumption can not reach more greatly the requirement of low-power consumption radio system to filtering power consumption; (2) current complex filter mainly joins the filter of the firstorder filter realization exponent number that requires by the utmost point, and therefore the limited power consumption that simultaneously consumes of cascade progression is large; (3) adopt the filter of cascade first-order filtering structure not produce complex-conjugate poles, can not realize Butterworth, Chebyshev's type filtering characteristic.Connecing in transceiver system of low-power consumption, can adopt restructural filter in order to reduce power consumption and chip area, this filter can be according to the hardware circuit of the real-time reconfigurable filter of system requirements, completes the complex filter function of receiving terminal or the low-pass filtering function of transmitting terminal.Thereby reach the object that reduces power consumption and reduce chip area.
Summary of the invention
technical problem:the object of the present invention is to provide a kind of restructural filter circuit of realizing complex filter and low-pass filtering, realize the restructural filter circuit of complex filter and low-pass filtering, this circuit can be used as the filter of the higher exponent number of the basic filter unit realization of second order.
technical scheme:for solving the problems of the technologies described above, the invention provides a kind of restructural filter circuit of realizing complex filter and low-pass filtering,
The positive pole input of the first radiofrequency signal connects first resistance one end, the other end of the first resistance respectively with the anode of second resistance one end, the first electric capacity, want closed when wanting closed second switch one end and realize low-pass filtering function while realizing low-pass filtering function the 3rd switch one end and join; The other end of wanting closed the 3rd switch while realizing low-pass filtering function respectively with the negative terminal of the 3rd electric capacity, want while realizing complex filter function one end and the 7th resistance one end of closed the 9th switch to join; The other end of wanting closed second switch while realizing low-pass filtering function respectively with the 6th resistance one end, the 7th resistance other end and while realizing plural band-pass filtering function one end of the 3rd switch of closure be connected, while realizing plural band-pass filtering function, the other end of the 3rd switch of closure joins with negative terminal input, the 4th electric capacity anode and the 5th resistance one end of the first amplifier respectively; The 4th electric capacity negative terminal respectively with one end of the output plus terminal of the first amplifier, the 3rd resistance and while realizing plural band-pass filtering function the 5th switch one end of closure join; The output plus terminal of the first amplifier is the output cathode of the first radiofrequency signal;
The other end of the second resistance respectively with the input anode of the first amplifier, the second electric capacity anode, while realizing plural band-pass filtering function second switch one end of closure and while realizing plural band-pass filtering function first switch one end of closure join, while realizing plural band-pass filtering function the other end of the first switch of closure respectively with the other end of the 3rd resistance, the first switch one end of wanting closed while realizing low-pass filtering function joins, the second electric capacity negative terminal is exported negative terminal with the first amplifier respectively, the other end of the 6th resistance and while realizing plural band-pass filtering function the 4th switch other end of closure join, the negative terminal of the first amplifier is the output negative pole of the first radiofrequency signal.
The negative pole input of the first radiofrequency signal connects the 4th resistance one end, and the other end of the 4th resistance is respectively with the 5th resistance other end, the 3rd electric capacity anode, want the first closed switch other end to join when wanting the 4th closed switch one end and realize low-pass filtering function while realizing low-pass filtering function; The other end of wanting closed the 4th switch while realizing low-pass filtering function respectively with the negative terminal of the first electric capacity, want while realizing complex filter function one end and the 8th resistance one end of closed the tenth switch to join, the 8th resistance other end wants when realizing complex filter function the other end of closed second switch to join.
The positive pole input of the second radiofrequency signal connects the 11 resistance, the other end of the 11 resistance respectively with the anode of the 12 resistance one end, the 7th electric capacity, want closed when wanting the 5th closed switch one end and realize low-pass filtering function while realizing low-pass filtering function the 8th switch one end and join; The other end of wanting closed the 5th switch while realizing low-pass filtering function respectively with the negative terminal of the 5th electric capacity, want while realizing complex filter function the other end and the 9th resistance one end of closed the 4th switch to join, the 9th resistance other end one end that the minion of closure is closed when realizing plural band-pass filtering function joins; The other end of wanting closed the 8th switch while realizing low-pass filtering function respectively with the 16 resistance one end and while realizing plural band-pass filtering function one end of the 8th switch of closure join, while realizing plural band-pass filtering function the other end of the 8th switch of closure respectively with the input negative terminal of the 8th electric capacity anode, the 15 resistance one end, the second amplifier and the other end that the minion of closure is closed while realizing plural band-pass filtering function join; The input anode of the 12 resistance other end and the 6th electric capacity anode, the second amplifier and while realizing plural band-pass filtering function the 6th switch one end of closure join; The 6th electric capacity negative terminal respectively with the output negative terminal of the 16 resistance other end, the second amplifier and while realizing plural band-pass filtering function the tenth switch other end of closure join, the negative terminal of the second amplifier is the output negative pole of the second radiofrequency signal.
The input negative terminal of the second radiofrequency signal connects the 14 resistance, the other end of the 14 resistance respectively with the 15 resistance other end, the 5th electric capacity anode, want closed while wanting while realizing low-pass filtering function closed minion close one end and realize low-pass filtering function the 6th switch one end and join, the other end of wanting closed the 6th switch while realizing low-pass filtering function respectively with the negative terminal of the 7th electric capacity, while realizing complex filter function, want the other end and the tenth resistance one end of the 5th switch of closure to join, the other end of the tenth resistance is wanted respectively the other end of closed the 6th switch when realizing complex filter function, while realizing low-pass filtering function, want one end that closed minion is closed the other end and the 13 resistance to join, the other end of the 13 resistance respectively with the output plus terminal of the second amplifier, the 8th electric capacity negative terminal and the 9th switch of closure while realizing plural band-pass filtering function) other end joins, the anode of the second amplifier is the output plus terminal of the second radiofrequency signal.
beneficial effect:compared with prior art, the present invention has the following advantages:
Restructural filter circuit proposed by the invention can be according to the real-time reconfigurable circuit of system requirements to realize complex filter function and the low-pass filtering function of system requirements, change and originally designed respectively the complex filter of receiving terminal and the low pass filter design framework of transmitting terminal, saved circuit cost thereby the requirement to power consumption that can meet better low-power consumption radio system has effectively reduced chip area simultaneously; IQ two-way only can be realized complex filter and the low-pass filtering with second-order filter characteristic with an operational amplifier separately can further reduce system power dissipation and chip area; Circuit can be realized a pair of complex-conjugate poles, thereby can obtain Butterworth, Chebyshev's type filtering characteristic; The present invention can be used as a second-order filter unit, can form the filter of higher exponent number with first-order filtering unit.
Brief description of the drawings
Fig. 1 is circuit topology figure of the present invention;
Fig. 2 is the circuit topology figure that adopts three rank restructural filters of the present invention's realization;
Fig. 3 is the low-frequency filter characteristics curve that adopts three rank restructural filters of the present invention's realization;
Fig. 4 is the plural band-pass filtering property curve that adopts three rank restructural filters of the present invention's realization.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
The theory of complex filter is taking real number filtering theory as basis, and an important method of design complex filter is carried out linear frequency to real filter exactly and moved (by low pass or the limit of high pass real filter moves up and down along the imaginary axis) and obtain complex filter.In circuit, the orthogonal signal of IQ two-way is realized the transfer function with plural coefficient by feedback, obtains complex filter.Therefore the design of whole restructural filtering, based on complex filter design, by the adjustment completing circuit reconstruct of the shutoff to frequency displacement network and RC constant, realizes complex filter function and low-pass filtering function.The low pass filter of IQ two-way adopts Sallen-Key mode filter structure, uses an operational amplifier to realize the filtering characteristic on two rank.Circuit can produce a pair of complex-conjugate poles, therefore can obtain Butterworth, the filtering characteristic of Chebyshev's type.For the filtering characteristic that will realize, can obtain corresponding plural pole value by searching the coefficient table of corresponding filtering characteristic, then can calculate resistance value and the capacitance in circuit according to bandwidth and center frequency value and the gain that will reach.In the time connecing transceiver and be operated in receiving mode, restructural filter is realized complex filter by the frequency shifts of setting up Q road and completing real number filtering to feedback and the I road on I road to the feedback on Q road; In the time connecing transceiver and be operated in emission mode, restructural filter is realized IQ two-way low pass filter separately, the reconstruct of completing circuit to I road and I road to the feedback on Q road by cutting off Q road.
This restructural filter circuit can be elaborated to its operation principle below in conjunction with physical circuit figure and simulation result with the complex filter function and the low-pass filtering function that realize system requirements according to the real-time reconfigurable circuit of system requirements.
Reach by the control of respective switch being realized to the reconstruct of hardware circuit plural band-pass filtering function or the low-pass filtering function that system needs, these two kinds of filter functions are all to adopt an operational amplifier to realize second-order filter characteristic, thereby can greatly reduce chip area and circuit power consumption.
Realize the restructural filter circuit of complex filter and low-pass filtering, in complex filter situation, Q road signal is by frequency displacement network-feedback to I road, and I road signal to Q road, can reach thereby realize filter function the effect that suppresses image signal by frequency displacement network-feedback in the frequency displacement of complex field.By cutting off frequency displacement network and the control to respective switch, the in the situation that of holding circuit agent structure, can realize I, the low pass filter of Q two-way, completing circuit reconstruct.Complex filter and low-pass filtering are all to realize the filtering characteristic of second order by an operational amplifier, in obtaining high filtering performance, have greatly reduced chip area and circuit power consumption.The restructural filter proposing can be used as second-order filter unit, then can be combined into the filter of higher exponent number with first-order filtering unit.
Referring to Fig. 1-4, operational amplifier adds sequence number with amplifier and represents; Electric capacity adds sequence number with C and represents; Resistance adds sequence number with R and represents; While realizing plural band-pass filtering function, the switch of closure adds sequence number with SP and represents, wants closed switch to add sequence number with SL and represent while realizing low-pass filtering function; Represent with I with the link of radiofrequency signal homophase, the link orthogonal with radiofrequency signal represents with Q, represent with Iin+ with the positive pole input of the link I of radiofrequency signal homophase, anodal output represents with Iout+, represent with Iin-with the negative pole input of the link I of radiofrequency signal homophase, negative pole output represents with Iout-; Represent with Qin+ with the positive pole input of the orthogonal link Q of radiofrequency signal, anodal output represents with Qout+, represents with Qin-with the negative pole input of the orthogonal link Q of radiofrequency signal, and negative pole output represents with Qout-; Dotted line institute frame part is frequency displacement network.
Realize a restructural filter circuit for complex filter and low-pass filtering, wherein,
The positive pole input Iin+ on the first radiofrequency signal I road connects first resistance R 1 one end, the other end of the first resistance R 1 respectively with the anode of second resistance R 2 one end, the first capacitor C 1, want closed when wanting closed second switch SL2 one end and realize low-pass filtering function while realizing low-pass filtering function the 3rd switch S L3 one end and join; The other end of wanting closed the 3rd switch S L3 while realizing low-pass filtering function respectively with the negative terminal of the 3rd capacitor C 3, want while realizing complex filter function one end and the 7th resistance R 7 one end of closed the 9th switch S P9 to join; The other end of wanting closed second switch SL2 while realizing low-pass filtering function respectively with the 6th resistance R 6 one end, the 7th resistance R 7 other ends and while realizing plural band-pass filtering function one end of the 3rd switch S P3 of closure be connected, while realizing plural band-pass filtering function, the other end of the 3rd switch S P3 of closure joins with negative terminal input, the 4th capacitor C 4 anodes and the 5th resistance R 5 one end of the first amplifier OPAMP1 respectively; The 4th capacitor C 4 negative terminals respectively with one end of the output plus terminal of the first amplifier OPAMP1, the 3rd resistance R 3 and while realizing plural band-pass filtering function the 5th switch S P5 one end of closure join; The output plus terminal of the first amplifier OPAMP1 is the output cathode Iout+ on the first radiofrequency signal I road;
The other end of the second resistance R 2 respectively with the input anode of the first amplifier OPAMP1, the second capacitor C 2 anodes, while realizing plural band-pass filtering function second switch SP2 one end of closure and while realizing plural band-pass filtering function first switch S P1 one end of closure join, while realizing plural band-pass filtering function the other end of the first switch S P1 of closure respectively with the other end of the 3rd resistance R 3, the first switch S L1 one end of wanting closed while realizing low-pass filtering function joins, the second capacitor C 2 negative terminals are exported negative terminal with the first amplifier OPAMP1 respectively, the other end of the 6th resistance R 6 and while realizing plural band-pass filtering function the 4th switch S P4 other end of closure join, the negative terminal of the first amplifier OPAMP1 is the output negative pole Iout-on the first radiofrequency signal I road.
The negative pole input Iin-on the first radiofrequency signal I road connects the 4th resistance R 4 one end, and the other end of the 4th resistance R 4 is respectively with the 5th resistance R 5 other ends, the 3rd capacitor C 3 anodes, want the first closed switch S L1 other end to join when wanting the 4th closed switch S L4 one end and realize low-pass filtering function while realizing low-pass filtering function; The other end of wanting closed the 4th switch S L4 while realizing low-pass filtering function respectively with the negative terminal of the first capacitor C 1, want while realizing complex filter function one end and the 8th resistance R 8 one end of closed the tenth switch S P10 to join, the 8th resistance R 8 other ends want when realizing complex filter function the other end of closed second switch SP2 to join.
The other end that the positive pole input Qin+ on the second radiofrequency signal Q road connects the 11 resistance R 11, the 11 resistance R 11 respectively with the anode of the 12 resistance R 12 one end, the 7th capacitor C 7, want closed when wanting the 5th closed switch S L5 one end and realize low-pass filtering function while realizing low-pass filtering function the 8th switch SL8 one end and join; The other end of wanting closed the 5th switch S L5 while realizing low-pass filtering function respectively with the negative terminal of the 5th capacitor C 5, want while realizing complex filter function the other end and the 9th resistance R 9 one end of closed the 4th switch S P4 to join, one end that the 9th resistance R 9 other ends minion of closure when realizing plural band-pass filtering function is closed SP7 joins; The other end of wanting closed the 8th switch SL8 while realizing low-pass filtering function respectively with the 16 resistance R 16 one end and while realizing plural band-pass filtering function one end of the 8th switch SP8 of closure join, while realizing plural band-pass filtering function, the other end of the 8th switch SP8 of the closure other end that the minion of closure is closed SP7 with the input negative terminal of the 8th capacitor C 8 anodes, the 15 resistance R 15 one end, the second amplifier OPAMP2 and while realizing plural band-pass filtering function respectively joins; The input anode of the 12 resistance R 12 other ends and the 6th capacitor C 6 anodes, the second amplifier OPAMP2 and while realizing plural band-pass filtering function the 6th switch S P6 one end of closure join; The 6th capacitor C 6 negative terminals respectively with the output negative terminal of the 16 resistance R 16 other ends, the second amplifier OPAMP2 and while realizing plural band-pass filtering function the tenth switch S P10 other end of closure join, the negative terminal of the second amplifier OPAMP2 is the output negative pole Qout-on the second radiofrequency signal Q road.
The other end that the input negative terminal Qin-on the second radiofrequency signal Q road connects the 14 resistance R 14, the 14 resistance R 14 respectively with the 15 resistance R 15 other ends, the 5th capacitor C 5 anodes, want closed while wanting closed minion close SL7 one end and realize low-pass filtering function while realizing low-pass filtering function the 6th switch S L6 one end and join, the other end of wanting closed the 6th switch S L6 while realizing low-pass filtering function respectively with the negative terminal of the 7th capacitor C 7, while realizing complex filter function, want the other end and the tenth resistance R 10 one end of the 5th switch S P5 of closure to join, the other end of the tenth resistance R 10 is wanted respectively the other end of closed the 6th switch S P6 when realizing complex filter function, while realizing low-pass filtering function, want one end that closed minion is closed the SL7 other end and the 13 resistance 13 to join, the other end of the 13 resistance R 13 respectively with the output plus terminal of the second amplifier OPAMP2, the 8th capacitor C 8 negative terminals and while realizing plural band-pass filtering function the 9th switch S P9 other end of closure join, the anode of the second amplifier OPAMP2 is the output plus terminal Qout+ on the second radiofrequency signal Q road.
The present invention only adopts the first amplifier OPAMP1 of the first radiofrequency signal I road link and the second amplifier OPAMP2 of the second radiofrequency signal Q road link and corresponding resistance capacitance, can realize plural bandpass filtering and the low-pass filtering of second order.When realizing complex filter function, closure wants closed the first switch S P1 to the ten switch S P10, open the first switch S L1 to the eight switch SL8 that want closure while realizing low-pass filtering function, set up the feedback network on I road and Q road from face, thereby the frequency shifts that completes real number low-pass filtering obtains complex filter; Otherwise, can turn-off the feedback network on I road and Q road, complete the reconstruct of complex filter to real number low-pass filtering.The present invention can realize two kinds of filter functions by the reconstruct of hardware circuit, has greatly reduced chip area and circuit power consumption, only can realize second-order filter characteristic by two amplifiers simultaneously, thereby can further reduce chip area and circuit power consumption.
As shown in Figure 1, circuit comprises IQ two-way, the differential operational amplifier of a both-end input both-end of every Lu Douyong output, and dashed middle line institute frame part is frequency displacement network.In the time of system requirements complex filter, open switch S L1 and SL2 on I road, Closing Switch SP1 and SP3, make R3 connect the input anode of OPAMP1 by switch S P1, and R6 connects the input negative terminal of OPAMP2 by switch S P3; Open switch S L3 and SL4, Closing Switch SP2, SP10 and SP9, thus set up the feedback network of Q road to I road; Open switch S L5 and SL6 on Q road, Closing Switch SP6 and SP8, make R13 connect the input anode of OPAMP2 by switch S P6, and R16 connects the input negative terminal of OPAMP2 by switch S P8; Open switch S L7 and SL8, Closing Switch SP7, SP4 and SP5, set up the feedback network of I road to Q road from face.Thereby the frequency shifts that completes real number low-pass filtering by above operation obtains complex filter.In the time of system requirements low-pass filtering, at I road Closing Switch SL1 and SL2, open switch S P1 and SP3, make R3 join and meet R4 and C3 simultaneously by switch S L1 and R5, R6 is joined and is met R1 and C1 simultaneously by switch S L2 and R2; Closing Switch SL3 and SL4, open switch S P2, and SP9 and SP10 cut off the feedback network of Q road to I road; At Q road Closing Switch SL7 and SL8, open switch S P6 and SP8, make R13 join and meet R14 and C5 simultaneously by switch S L7 and R15, make R16 join and meet R11 and C7 simultaneously by switch S L8 and R12; Closing Switch SL5 and SL6, open switch S P7, SP4 and SP5, thus cut off the feedback network of I road to Q road, realize two low pass filters on I road and Q road.This filter adopts Sallen-Key structure, only uses an operational amplifier can realize a filter with second-order filter characteristic, thereby and can produce a pair of complex-conjugate poles and can realize Butterworth, Chebyshev's filtering characteristic.The concrete resistance capacitance value of every grade of circuit is by the filtering exponent number that will realize, filtering type, and bandwidth, centre frequency and gain determine.
Fig. 2 is the circuit topology figure that adopts three rank restructural filters of the present invention's realization, and wherein the first order adopts the second order complex filter unit that the present invention proposes, and afterbody is a general first-order filtering unit.In first order circuit, R1, R4, R11 and R14 value are equal, and C1, C3, C5 and C7 value equate, R2, R5, R12 and R15 value equate, C2, C4, C6 and C8 value are equal, and R3, R6, R13 and R16 value are equal, and R7, R8, R9 and R10 value equate.In the circuit of the second level, R17, R18, R26 and R27 value equate, C9, C10, C11 and C12 value are equal, and R19, R20, R25 and R28 value are equal, and R21, R22, R23 and R24 value equate.In the time calculating the resistance capacitance value of every grade of circuit, first obtain plural pole value that the corresponding filter function of corresponding exponent number is corresponding by tabling look-up and by centre frequency to bandwidth normalization, distribute a pair of plural limit and corresponding gain to each second order complex filter unit, derive again the transfer function of every grade of circuit, can obtain one group of equation about resistance capacitance by the method for undetermined coefficients, thereby obtain corresponding resistance capacitance value, this resistance capacitance value is to the value after bandwidth normalization, bandwidth value and the suitable resistance magnitude passing through to realize obtain concrete resistance capacitance value again.The method of above calculated resistance capacitance is equally applicable to the low pass situation that restructural filter will be realized.In the circuit process with the mutual reconstruct of low-pass filtering logical by plural number band, resistance value can change, and can complete by accessing or disconnecting corresponding resistance, and detailed process, due to relevant to the filter that will realize, does not provide in circuit.Operational amplifier is the output of both-end input both-end, and its bandwidth and gain are determined by filtering performance.
Fig. 3 is operated in the frequency curve under low-pass filtering pattern for three realized rank restructural filters, and selected filtering type is Butterworth type, and cut-off frequency is 1.5MHz, gains as 12dB.Fig. 4 is the frequency curve being operated under the logical pattern of plural number band, bandwidth 3MHz, and centre frequency 2MHz, gains as 12dB, and mirror image inhibition is-13.68dB.By simulation result, can illustrate, adopt three rank restructural filter circuits proposed by the invention can complete well complex filter function and low-pass filtering function.
The foregoing is only preferred embodiments of the present invention; protection scope of the present invention is not limited with above-mentioned execution mode; in every case the equivalence that those of ordinary skill in the art do according to disclosed content is modified or is changed, and all should include in the protection range of recording in claims.
Claims (1)
1. a restructural filter circuit of realizing complex filter and low-pass filtering, is characterized in that:
The positive pole input (Iin+) on the first radiofrequency signal I road connects the first resistance (R1) one end, the other end of the first resistance (R1) respectively with the anode of the second resistance (R2) one end, the first electric capacity (C1), want closed when wanting closed second switch SL2 one end and realize low-pass filtering function while realizing low-pass filtering function the 3rd switch S L3 one end and join; The other end of wanting closed the 3rd switch S L3 while realizing low-pass filtering function respectively with the negative terminal of the 3rd electric capacity (C3), want while realizing complex filter function one end and the 7th resistance (R7) one end of closed the 9th switch S P9 to join; The other end of wanting closed second switch SL2 while realizing low-pass filtering function respectively with the 6th resistance (R6) one end, the 7th resistance (R7) other end and while realizing plural band-pass filtering function one end of the 3rd switch S P3 of closure be connected, while realizing plural band-pass filtering function, the other end of the 3rd switch S P3 of closure joins with negative terminal input, the 4th electric capacity (C4) anode and the 5th resistance (R5) one end of the first amplifier (OPAMP1) respectively; The 4th electric capacity (C4) negative terminal respectively with one end of the output plus terminal of the first amplifier (OPAMP1), the 3rd resistance (R3) and while realizing plural band-pass filtering function the 5th switch S P5 one end of closure join; The output plus terminal of the first amplifier (OPAMP1) is the output cathode (Iout+) on the first radiofrequency signal I road;
The other end of the second resistance (R2) respectively with input anode, the second electric capacity (C2) anode of the first amplifier (OPAMP1), while realizing plural band-pass filtering function closure second switch SP2 one end and while realizing plural band-pass filtering function first switch S P1 one end of closure join, closure while realizing plural band-pass filtering function
thethe other end of one switch S P1 respectively with the other end of the 3rd resistance (R3), want closed while realizing low-pass filtering function first switch S L1 one end and join, the second electric capacity (C2) negative terminal respectively with the other end of the first amplifier (OPAMP1) output negative terminal, the 6th resistance (R6) and while realizing plural band-pass filtering function the 4th switch S P4 other end of closure join; The output negative terminal of the first amplifier (OPAMP1) is the output negative pole (Iout-) on the first radiofrequency signal I road;
The negative pole input (Iin-) on the first radiofrequency signal I road connects the 4th resistance (R4) one end, and the other end of the 4th resistance (R4) is respectively with the 5th resistance (R5) other end, the 3rd electric capacity (C3) anode, want the first closed switch S L1 other end to join when wanting the 4th closed switch S L4 one end and realize low-pass filtering function while realizing low-pass filtering function; The other end of wanting closed the 4th switch S L4 while realizing low-pass filtering function respectively with the negative terminal of the first electric capacity (C1), want while realizing complex filter function one end and the 8th resistance (R8) one end of closed the tenth switch S P10 to join, the 8th resistance (R8) other end wants when realizing complex filter function the other end of closed second switch SP2 to join;
The positive pole input (Qin+) on the second radiofrequency signal Q road connects the 11 resistance (R11), the other end of the 11 resistance (R11) respectively with the anode of the 12 resistance (R12) one end, the 7th electric capacity (C7), want closed when wanting the 5th closed switch S L5 one end and realize low-pass filtering function while realizing low-pass filtering function the 8th switch SL8 one end and join; The other end of wanting closed the 5th switch S L5 while realizing low-pass filtering function respectively with the negative terminal of the 5th electric capacity (C5), want while realizing complex filter function the other end and the 9th resistance (R9) one end of closed the 4th switch S P4 to join, one end that the 9th resistance (R9) other end minion of closure when realizing plural band-pass filtering function is closed SP7 joins; The other end of wanting closed the 8th switch SL8 while realizing low-pass filtering function respectively with the 16 resistance (R16) one end and while realizing plural band-pass filtering function one end of the 8th switch SP8 of closure join, while realizing plural band-pass filtering function, the other end of the 8th switch SP8 of the closure other end that the minion of closure is closed SP7 with the input negative terminal of the 8th electric capacity (C8) anode, the 15 resistance (R15) one end, the second amplifier (OPAMP2) and while realizing plural band-pass filtering function respectively joins; The input anode of the 12 resistance (R12) other end and the 6th electric capacity (C6) anode, the second amplifier (OPAMP2) and while realizing plural band-pass filtering function the 6th switch S P6 one end of closure join; The 6th electric capacity (C6) negative terminal respectively with the output negative terminal of the 16 resistance (R16) other end, the second amplifier (OPAMP2) and while realizing plural band-pass filtering function the tenth switch S P10 other end of closure join, the output negative terminal of the second amplifier (OPAMP2) is the output negative pole (Qout-) on the second radiofrequency signal Q road;
The negative pole input (Qin-) on the second radiofrequency signal Q road connects the 14 resistance (R14), the other end of the 14 resistance (R14) respectively with the 15 resistance (R15) other end, the 5th electric capacity (C5) anode, want closed while wanting closed minion close SL7 one end and realize low-pass filtering function while realizing low-pass filtering function the 6th switch S L6 one end and join, the other end of wanting closed the 6th switch S L6 while realizing low-pass filtering function respectively with the negative terminal of the 7th electric capacity (C7), while realizing complex filter function, want the other end and the tenth resistance (R10) one end of the 5th switch S P5 of closure to join, the other end of the tenth resistance (R10) is wanted respectively the other end of closed the 6th switch S P6 when realizing complex filter function, while realizing low-pass filtering function, want one end that closed minion is closed the SL7 other end and the 13 resistance (R13) to join, the other end of the 13 resistance (R13) respectively with the output plus terminal of the second amplifier (OPAMP2), the 8th electric capacity (C8) negative terminal and while realizing plural band-pass filtering function the 9th switch S P9 other end of closure join, the output plus terminal of the second amplifier (OPAMP2) is the output cathode (Qout+) on the second radiofrequency signal Q road.
Priority Applications (1)
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Cited By (1)
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| WO2022005630A1 (en) * | 2020-06-29 | 2022-01-06 | Qualcomm Incorporated | Programmable baseband filter for selecting between single-pole or complex-poles frequency response |
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| CN103151996B (en) * | 2013-03-01 | 2016-03-16 | 东南大学 | A kind of reconfigurable filter |
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| CN103326694B (en) * | 2013-05-23 | 2015-08-26 | 江苏博纳雨田通信电子有限公司 | Calibration complex filter |
| CN106505968B (en) * | 2016-11-02 | 2019-03-05 | 珠海市杰理科技股份有限公司 | Reconfigurable filter and complex filter |
| CN106374872B (en) * | 2016-11-09 | 2018-11-06 | 东南大学 | A kind of low-power consumption complex filter circuit |
| CN107819451B (en) * | 2017-10-26 | 2022-07-05 | 山东大学 | Active RC complex band-pass filter |
| CN109714022A (en) * | 2018-12-13 | 2019-05-03 | 航天恒星科技有限公司 | A kind of filter that multidimensional is restructural |
| CN110719087B (en) * | 2019-09-26 | 2024-02-06 | 东南大学 | Reconfigurable harmonic suppression complex filter |
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