CN110048738A - Saturation detection circuit and transceiver based on automatic gain management - Google Patents
Saturation detection circuit and transceiver based on automatic gain management Download PDFInfo
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- CN110048738A CN110048738A CN201910315019.8A CN201910315019A CN110048738A CN 110048738 A CN110048738 A CN 110048738A CN 201910315019 A CN201910315019 A CN 201910315019A CN 110048738 A CN110048738 A CN 110048738A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/401—Circuits for selecting or indicating operating mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/15—Performance testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/29—Performance testing
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Abstract
The present invention relates to a kind of saturation detection circuit and the transceiver based on automatic gain management.The transceiver based on automatic gain management includes: Anneta module, frequency synthesis module, receiving module, the first saturation detection module, baseband processing module, transmitting module, the second saturation detection module.The transceiver based on automatic gain management detects the amplitude of oscillation of receiving module and transmitting module output signal by the way that saturation detection module is arranged, it is adjusted with the gain that module and transmitting module are received in timely docking, to reduce the power consumption of transceiver in time, so that the power consumption and performance of transceiver are optimal value.
Description
Technical field
The invention belongs to radio circuit fields, and in particular to a kind of saturation detection circuit and the nothing based on automatic gain management
Line transceiver.
Background technique
In information age today, people are by the transmitting of information and the interactive necessary component as social life.Its
In, wireless communication is a part the most active in the communications field, is all widely used in all fields.
It is wireless to receive with the continuous growth of radio frequency applications demand and the continuous innovation of CMOS Advanced Manufacturing Technology
Hair machine needs to meet the rigors of communication system in design.Such as: the radiofrequency signal received with transceiver
Difference, the entire gain of transceiver also can be different therewith；But there is the module of multiple achievable gains in transceiver
To realize the entire gain of transceiver, in different environments, to each module, then adjustable gain range is required to difference.
But in current transceiver design, can not in real time the amplitude of oscillation to each module of transceiver into
Row detection, so that the gain of transceiver is unable to get timely adjusting, so that the power consumption of transceiver is larger, it is whole
Performance is poor.
Summary of the invention
In order to solve the above-mentioned problems in the prior art, the present invention provides a kind of saturation detection circuit and based on certainly
The transceiver of dynamic gain management.The technical problem to be solved in the present invention is achieved through the following technical solutions:
The embodiment of the invention provides a kind of saturation detection circuits, comprising: first switch, second switch, the first metal-oxide-semiconductor,
Second metal-oxide-semiconductor, capacitor, resistance and comparator, wherein
The first end of the first switch is connected to first input end, and the second end of the first switch is connected to first
The drain electrode of metal-oxide-semiconductor and the grid of second metal-oxide-semiconductor；
The first end of the second switch is connected to the second input terminal, and the second end of the second switch is connected to described
The drain electrode of two metal-oxide-semiconductors and the grid of first metal-oxide-semiconductor；
The source electrode of first metal-oxide-semiconductor connects the source electrode of second metal-oxide-semiconductor, and is connected to the input of the comparator
End；
One end of the capacitor is connect with the source electrode of the source electrode of first metal-oxide-semiconductor and second metal-oxide-semiconductor, and is connected to
The input terminal of the comparator, the other end ground connection of the capacitor；
One end of the resistance is connect with the source electrode of the source electrode of first metal-oxide-semiconductor and second metal-oxide-semiconductor, and is connected to
The input terminal of the comparator, the other end ground connection of the resistance.
Another embodiment of the present invention provides a kind of transceiver based on automatic gain management, comprising:
Anneta module, for receiving and emitting radiofrequency signal；
Frequency synthesis module, for providing local oscillated signal；
Receiving module carries out amplified signal and the local oscillated signal for amplifying to the radiofrequency signal
Mixing, then by the signal after mixing after filtering, amplification and analog-to-digital conversion, obtains the first digital signal；
First saturation detection module detects for the amplitude of oscillation to the receiving module output signal, obtains and export
First testing result, wherein the first saturation detection module includes at least one such as saturation detection provided in an embodiment of the present invention
Circuit；
Baseband processing module is obtained for carrying out digital processing to first testing result and first digital signal
First processing result, and the second digital signal for transmitting is generated, while providing third number for the frequency synthesis module
Signal is to generate the local oscillated signal；
Transmitting module, for carrying out digital-to-analogue conversion, filtering and amplification to second digital signal, by amplified signal
It is mixed with the local oscillated signal, after then the signal after mixing is filtered and is amplified, obtains the radio frequency letter
Number；
Second saturation detection module detects for the amplitude of oscillation to the transmitting module output signal, obtains and export
Second testing result is to the baseband processing module, and the baseband processing module is to second testing result and second number
Word signal carry out digitized processing, obtain second processing as a result, wherein the second saturation detection module include at least one such as
Saturation detection circuit provided in an embodiment of the present invention.
In one embodiment of the invention, further includes:
First gain management module is used for according to first testing result and first processing result to the reception
The gain of module is adjusted；
Second gain management module is used for according to second testing result and the second processing result to the transmitting
The gain of module is adjusted.
In one embodiment of the invention, the receiving module includes:
Low-noise amplifier obtains the first amplified signal for amplifying to the radiofrequency signal；
First mixting circuit is obtained for first amplified signal and the first phase signal to be carried out frequency translation
To the first mixed frequency signal；
First low-pass filter obtains the first filtering signal for being filtered to first mixed frequency signal；
First variable gain amplifier obtains the second amplified signal for amplifying to first filtering signal；
Second low-pass filter obtains the second filtering signal for being filtered to second amplified signal；
First analog-digital converter, for second filtering signal to be converted to the 4th digital signal；
It is mixed to obtain second for the amplified signal and second phase signal to be carried out frequency translation for second mixting circuit
Frequency signal；
Third low-pass filter obtains third filtering signal for being filtered to second mixed frequency signal；
Second variable gain amplifier obtains third amplified signal for amplifying to the third filtering signal；
4th low-pass filter obtains the 4th filtering signal for being filtered to second amplified signal；
Second analog-digital converter, for being converted to the 5th digital signal to the 4th filtering signal.
In one embodiment of the invention, the first saturation detection module includes:
First saturation detection circuit, for being filtered to first mixed frequency signal and by filtered signal and first
Parameter preset is compared, and obtains the first comparison result；
Second saturation detection circuit, for being filtered to second filtering signal and by filtered signal and second
Parameter preset is compared, and obtains the second comparison result.
In one embodiment of the invention, the first gain management module be used for according to first testing result and
First processing result successively amplifies the low-noise amplifier, first mixting circuit and first variable gain
The gain of device is adjusted.
In one embodiment of the invention, the transmitting module includes:
Second digital analog converter, for second digital signal to be converted to analog signal；
5th low-pass filter obtains the 5th filtering signal for being filtered to the analog signal；
Automatic gain control amplifier obtains the 4th amplified signal for amplifying the 5th filtering signal；
Third frequency mixer is obtained for carrying out frequency translation to the 4th amplified signal and the local oscillated signal
Third mixed frequency signal；
6th low-pass filter obtains the 6th filtering signal for being filtered to the third mixed frequency signal；
Power amplifier obtains the radiofrequency signal for transmitting for amplifying to the 6th filtering signal.
In one embodiment of the invention, the second saturation detection module includes:
Third saturation detection circuit, for being filtered to the 4th amplified signal and by filtered signal and third
Parameter preset is compared, and obtains third comparison result；
4th saturation detection circuit, for being filtered to the 6th filtering signal and by filtered signal and the 4th
Parameter preset is compared, and obtains the 4th comparison result；
5th saturation detection circuit, for the radiofrequency signal of transmitting is filtered and by filtered signal with
5th parameter preset is compared, and obtains the 5th comparison result.
In one embodiment of the invention, the second gain management module be used for according to second testing result and
The second processing result is successively to the automatic gain control amplifier, the third frequency mixer and the power amplifier
Gain is adjusted.
Compared with prior art, beneficial effects of the present invention:
1, the present invention examines the amplitude of oscillation of receiving module and transmitting module output signal by the way that saturation detection module is arranged
It surveys, will test result and be sent to baseband processing module, be adjusted with the gain that module and transmitting module are received in timely docking, thus
The power consumption for reducing transceiver in time, so that the power consumption and performance of transceiver are optimal value.
2, the present invention is successively adjusted by the gain to submodule each in receiving module according to the received sequence of signal
Section, the sequence emitted according to signal the gain of submodule each in transmitting module are successively adjusted, in a certain order
The gain for adjusting receiving module and transmitting module can make the power consumption of transceiver is orderly to change, make its performance
It is maintained at optimal value.
The present invention is described in further details below with reference to accompanying drawings and embodiments.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of saturation detection circuit provided in an embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of the transceiver based on automatic gain management provided in an embodiment of the present invention；
Fig. 3 is the structural representation of another transceiver based on automatic gain management provided in an embodiment of the present invention
Figure.
Specific embodiment
Further detailed description is done to the present invention combined with specific embodiments below, but embodiments of the present invention are not limited to
This.
Embodiment one
Referring to Figure 1, Fig. 1 is a kind of structural schematic diagram of saturation detection circuit provided in an embodiment of the present invention, the saturation
Detection circuit includes: first switch S1, second switch S2, the pass the first MOS M1, the second metal-oxide-semiconductor M2, capacitor C1, resistance R1 and ratio
Compared with device A1.
Wherein, the first end of first switch S1 is connected to first input end, and the second end of first switch S1 is connected to first
The drain electrode of metal-oxide-semiconductor M1 and the grid of the second metal-oxide-semiconductor M2.
The first end of second switch S2 is connected to the second input terminal, and the second segment of second switch S2 is connected to the second metal-oxide-semiconductor
Drain electrode and the first metal-oxide-semiconductor M1 grid.
The source electrode of first metal-oxide-semiconductor M1 connects the source electrode of the second metal-oxide-semiconductor M2, and is connected to the input terminal of comparator A1.
One end of capacitor C1 is connect with the source electrode of the source electrode of metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2, and is connected to the defeated of comparator
Enter end, the other end ground connection of capacitor C1.
One end of resistance R1 is connect with the source electrode of the source electrode of the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2, and is connected to comparator
The input terminal of A1, the other end ground connection of resistance R1.
By the connection relationship of above-mentioned component as it can be seen that the source electrode of the first metal-oxide-semiconductor M1, the source electrode of the second metal-oxide-semiconductor M2, capacitor C1
One end, resistance R1 one end be connected in same point, and be connected to the input terminal of comparator A1.
When carrying out the saturation detection of output signal to transceiver, it is defeated that the first end of first switch S1 is connected to first
Entering end, first input end is any bar of two differential signal lines in receiving module or transmitting module in transceiver, the
The first end of one switch S1 is connected to any bar in two differential signals；The first end of second switch S2 is connected to the second input
End, the second input terminal are another in receiving module or transmitting module in two differential signal lines in transceiver, second
The other end of switch S2 is connected to another in two differential signal lines；The output end of comparator A1 is connected to transceiver
In baseband processing module, the result compared is sent to baseband processing module and handled by comparator A1.
Specifically, when testing, opening first switch S1 and second switch S2, the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor
M2 is used to transmit the amplitude of oscillation of the output signal of receiving module or transmitting module, wherein the amplitude of oscillation of output signal refers to sine wave
Amplitude；Capacitor C1 and resistance R1 collectively constitutes low-pass filter, in the signal that low-pass filter passes over M1 and M2
High-frequency signal filters out, and by filtering out, range signal is only remained in output signal；Then range signal enters comparator A1, compares
Range signal is compared by device A1 with reference voltage VERF, obtains comparison result, and comparison result is exported to Base-Band Processing
Module is handled.
Further, the range of the reference voltage VERF value of disparate modules is different, and reference voltage VERF value can be according to difference
The needs of module are adjusted.
Further, range signal is compared by comparator A1 with the voltage swing of reference voltage VERF, works as comparator
When the output of the output end of A1 is high level, then saturation detection circuit detects module to be detected to module detected
It as a result is saturation；When the output of the output end of comparator A1 is low level, then to module detected, saturation detection circuit
The result detected is unsaturation.
Saturation detection circuit of the invention is compared after being filtered to the output signal of modules using comparator,
Detection method is easily operated, and will not impact to the work of transceiver.
Embodiment two
Fig. 2 is referred to, Fig. 2 is a kind of knot of the transceiver based on automatic gain management provided in an embodiment of the present invention
Structure schematic diagram, comprising: Anneta module 10, frequency synthesis module 20, receiving module 30, the first saturation detection module 40, at base band
Manage module 50, transmitting module 60, the second saturation detection module 70.
Wherein, Anneta module 10 is for receiving and emitting radiofrequency signal.Specifically, Anneta module 10 includes that signal receives mould
Block and signal emission module, signal receiving module is for receiving radiofrequency signal, and signal emission module is for emitting radiofrequency signal.
Frequency synthesis module 20 is for providing local oscillated signal.
Receiving module 30 is connect with Anneta module 10, frequency synthesis module 20 respectively, and receiving module 30 is used to believe radio frequency
Number amplify, be then mixed amplified signal with local oscillated signal, then by the signal after mixing by filtering,
After amplification and analog-to-digital conversion, the first digital signal is obtained.
First saturation detection module 40 obtains the first detection for detecting to the amplitude of oscillation of 30 output signal of receiving module
As a result, and exporting the first testing result；Wherein the first saturation detection module 40 includes several saturation detection circuits, saturation detection electricity
The structure on road refers to embodiment one, and for each saturation detection circuit, one end (input terminal) of first switch S1 is connected to
One end (input terminal) of any bar in receiving module 30 in two differential signal lines, second switch S2 is connected to receiving module 30
In another in two differential signal lines, the output end of comparator A1 is connected to Base-Band Processing mould in each saturation detection circuit
Block 50.Specifically, the first testing result includes two kinds of situations of high level and low level, wherein high level represents mould detected
Block is saturation state, and low level represents module detected as unsaturated state.
Baseband processing module 50 respectively with frequency synthesis module 20, receiving module 30, the first saturation detection module 40, transmitting
Module 50 and the connection of the second detection module 70, the first testing result and reception mould for being exported to the first saturation detection module 40
The first digital signal that block 30 exports carries out digital processing, to obtain the first processing result；Baseband processing module 50 is also used to produce
Raw the second digital signal for transmitting；Baseband processing module 50 is also used to provide third digital signal for frequency synthesis module 20
So that frequency synthesis module 20 generates local oscillated signal.
Transmitting module 60 is connect with frequency synthesis module 20, baseband processing module 50 respectively, for the second digital signal
Digital-to-analogue conversion, filtering and amplification are carried out, and amplified signal is mixed with local oscillated signal, it then will be after mixing
Signal is filtered and amplifies, and obtains the radiofrequency signal for transmitting, and the radiofrequency signal for transmitting is sent out by Anneta module 10
It is shot out.
Second saturation detection module 70 obtains the second detection for detecting to the amplitude of oscillation of 60 output signal of transmitting module
As a result, and the second testing result is exported to baseband processing module 50, baseband processing module 50 is to the second testing result and second
Digital signal carries out digitized processing, obtains second processing result；Wherein the second saturation detection module 70 is full including at least one
And detection circuit, the structure of saturation detection circuit refer to embodiment one；In each saturation detection circuit, the one of first switch S1
End (input terminal) is connected to any bar in transmitting module 60 in two differential signal lines, one end (input terminal) of second switch S2
It is connected to another in transmitting module 60 in two differential signal lines, the output end of comparator A1 in each saturation detection circuit
It is connected to baseband processing module 50.Second testing result equally includes two kinds of situations of high level and low level.
Specifically, transceiver mainly includes two stages: receiving stage and launching phase, receive stage and transmitting rank
Section can carry out simultaneously, can not also carry out simultaneously；Therefore, the first saturation detection module 40 is to the 30 output signal amplitude of oscillation of receiving module
Detection can be carried out simultaneously with detection of the second saturation detection module 70 to the 60 output signal amplitude of oscillation of transmitting module, can also be different
Shi Jinhang, the i.e. saturation detection of transmitting module and the saturation detection of receiving module are independent of each other.
The present invention is set in transmitting module by the way that the first saturation detection module is arranged in the receiving module of transceiver
The second saturation detection module is set, is examined by the amplitude of oscillation of the saturation detection module to the output signal of receiving module and transmitting module
It surveys, is adjusted with the gain that module and transmitting module are received in timely docking, so that the power consumption of transceiver is reduced in time, so that
The power consumption and performance of transceiver are optimal value.
In a specific embodiment, the transceiver based on automatic gain management further includes the first gain management module
80 and the second gain management module 90.Wherein, the first gain management module 80 connects with baseband processing module 50 and receiving module 30
It connects, for the gain of receiving module 30 to be adjusted according to the first testing result and the first processing result.Second gain management
Module 90 is connect with baseband processing module 50 and transmitting module 60, is used for according to the second testing result and second processing result to hair
The gain for penetrating module 60 is adjusted.
Further, after baseband processing module 50 receives the first testing result, to the first testing result and the first number
Word signal carries out integrated treatment, obtains the first processing result.When the first testing result is high level, then baseband processing module 50
Controlling the first gain management module 80 according to the first processing result reduces the gain of tested receiving module；When the first testing result
When for low level, then whether baseband processing module 50 reaches inspection according to the signal that the first processing result detects receiving module output
The minimum of survey requires, if reaching requirement, stops increasing gain.
Similarly, when the second testing result is high level, then baseband processing module 50 is according to second processing result control the
Two gain management modules 90 reduce the gain of tested transmitting module；When the second testing result is low level, then Base-Band Processing
Module 50 is required according to whether the signal that second processing result detects transmitting module output reaches the minimum of detection, is wanted if reaching
It asks, then stops increasing gain.
The present invention detects the amplitude of oscillation of receiving module and transmitting module output signal by the way that saturation detection module is arranged,
It will test result and be sent to baseband processing module, be adjusted with the gain that module and transmitting module are received in timely docking, thus and
When reduce transceiver power consumption so that the power consumption and performance of transceiver are optimal value.
Embodiment three
Fig. 3 is referred to, Fig. 3 is another transceiver based on automatic gain management provided in an embodiment of the present invention
Structural schematic diagram.
In a specific embodiment, frequency synthesis module 20 includes the first digital analog converter (DAC1), voltage-controlled crystal (oscillator) vibration
Swing device (VCXO), fractional frequency-division phase-locked loop (Fractional-N PLL).
Wherein, the first digital analog converter is connect with baseband processing module 50, for generating baseband processing module 50
Three digital signals are converted to quiescent voltage signal；Voltage Controlled Crystal Oscillator is connect with the first digital analog converter, for according to static state
Voltage signal generates stable reference clock；Fractional frequency-division phase-locked loop is connect with Voltage Controlled Crystal Oscillator, when for according to reference
Clock generates stable local oscillated signal.
Further, frequency synthesis module 20 further include: phase shifter is connected to fractional frequency-division phase-locked loop and receiving module 30
Between, it is adjusted for the phase to local oscillated signal, generates first phase signal and second phase signal.
Specifically, the signal that Fractional-N PLL is generated is the differential signal of 0 degree and 180 degree, and receiving module 30 wraps
The road containing I and the road Q, the road I it is desirable that 0 degree and 180 degree local oscillation signal, and the road Q is it is desirable that 90 degree and 270 degree of local oscillator is believed
Number.Therefore phase shifter is needed to generate the road I and the road Q respectively required signal, wherein first phase signal refers to needed for the road I and the road Q
One in signal, second phase signal refers to another in the road I and the road Q desired signal.Further, the model of phase shifter
0/90 phase shifter.
Further, the DAC1 in frequency synthesis module 20, VCXO, Fractional-N PLL can respectively be 1, they according to
It is secondary to be connect with receiving module 30, while successively being connect with transmitting module 60, local oscillated signal both was provided for receiving module 30,
Local oscillated signal is provided for transmitting module 60.In addition, for receiving module 30 provide local oscillated signal DAC1, VCXO,
Fractional-N PLL can provide DAC1, VCXO, Fractional-N of local oscillated signal with for transmitting module 60
PLL is different, that is, there is a set of DAC1, VCXO, Fractional-N PLL and receiving module 30 and be sequentially connected, exist simultaneously another
Set DAC1, VCXO, Fractional-N PLL and transmitting module 60 are sequentially connected.
In a specific embodiment, receiving module 30 includes submodule: low-noise amplifier (LNA), the first mixing electricity
Road (MIX1), the first low-pass filter (LPF1), the first variable gain amplifier (PGA1), the second low-pass filter (LPF2),
First analog-digital converter (ADC1), the second mixting circuit (MIX2), third low-pass filter (LPF3), the amplification of the second variable gain
Device (PGA2), the 4th low-pass filter (LPF4) and the second analog-digital converter (ADC2).
Wherein, low-noise amplifier is connect with Anneta module 10, and the radiofrequency signal for receiving to Anneta module 10 is put
Greatly, while good noiseproof feature is kept, obtains the first amplified signal.
First mixting circuit is connect with low-noise amplifier, and connects phase shifter, is used for amplified signal and the first phase
Position signal carries out frequency translation, and signal is further separated with noise, obtains the first mixed frequency signal.
First low-pass filter is connect with the first mixting circuit, for being filtered to the first mixed frequency signal, removal noise,
Obtain the first filtering signal.
First variable gain amplifier is connect with the first low-pass filter, right for amplifying to the first filtering signal
The signal of different amplitudes carries out different degrees of amplification, obtains the second amplified signal.
Second low-pass filter is connect with the first variable gain amplifier, for being filtered to the second amplified signal, into
One step removes noise, obtains the second filtering signal.
First analog-digital converter is connected between the second low-pass filter and baseband processing module, for believing the second filtering
Number the 4th digital signal is converted to, and the 4th digital signal is sent to baseband processing module.
Second mixting circuit is connect with low-noise amplifier, and connects phase shifter, is used for amplified signal and the second phase
Position signal carries out frequency translation, and signal is further separated with noise, obtains the second mixed frequency signal.
Third low-pass filter is connect with the second mixting circuit, for being filtered to the second mixed frequency signal, removal noise,
Obtain third filtering signal.
Second variable gain amplifier is connect with third low-pass filter, right for amplifying to third filtering signal
The signal of different amplitudes carries out different degrees of amplification, obtains third amplified signal.
4th low-pass filter is connect with the second variable gain amplifier, for being filtered to third amplified signal, into
One step removes noise, obtains the 4th filtering signal.
Second analog-digital converter is connected between the 4th low-pass filter and baseband processing module 50, for filtering the 4th
Signal is converted to the 5th digital signal, and the 5th digital signal is sent to baseband processing module 50.
It should be noted that in the embodiment of the present invention, since ADC1, ADC2 are the last one moulds in receiving module 30
Block, therefore, the first digital signal that receiving module 30 handles radiofrequency signal include the 4th digital signal and the 5th
Digital signal.
Further, the first saturation detection module 40 includes: the first saturation detection circuit 401 and the second saturation detection circuit
402.The structure of first saturation detection circuit 401 and the second saturation detection circuit 402 refers to embodiment one.
Wherein, the input terminal of the first saturation detection circuit 401 is connected to two difference of the output end of the first mixting circuit
On signal wire, and the output end of the first saturation detection circuit 401 connects baseband processing module 50, for the first mixting circuit
The first obtained mixed frequency signal is filtered, and filtered signal is compared with the first parameter preset, obtains the first ratio
Compared with as a result, exporting the first comparison result to baseband processing module 50.
Specifically, the first saturation detection circuit 401 passes to the amplitude of oscillation for receiving the first mixed frequency signal by M1 and M2
The low-pass filter of C1 and R1, C1 and R1 composition is filtered the first mixed frequency signal, and filtered signal is only left amplitude letter
Number, then, which is compared by comparator A1 with the first parameter preset, to obtain the first comparison result.Wherein,
One parameter preset can be the first reference voltage VREF；First comparison result includes two kinds of situations of high level and low level.
The input terminal of second saturation detection circuit 402 is connected on two differential signal lines of LPF2 output end, and second is full
Connect baseband processing module 50 with the output end of detection circuit 402, the second saturation detection circuit 402 be used to obtain LPF2 the
Two filtering signals are filtered, and filtered signal is compared with the second parameter preset, obtain the second comparison result.
Specifically, the second saturation detection circuit 402 passes to the amplitude of oscillation for receiving the second filtering signal by M1 and M2
The low-pass filter of C1 and R1, C1 and R1 composition is filtered the second filtering signal, and filtered signal is only left amplitude letter
Number, then, which is compared by the comparator A1 in the second saturation detection circuit 402 with the second parameter preset, obtains
To the second comparison result.Wherein, the second parameter preset can be the second reference voltage VREF；Second comparison result includes high level
With two kinds of situations of low level.
Wherein, the first testing result includes two kinds of situations of the first comparison result and the second comparison result.
It should be noted that saturation detection circuit 401,402 is for detecting whether the output of modules reaches saturation
State, reference voltage VREF value can be adjusted according to the difference of module detected；In addition, if saturation detection module is examined
Measuring the module is saturation state, i.e. the output of saturation detection module is high level, then should saturation detection circuit 401,402
Testing result is transmitted to baseband processing module 50, and baseband processing module 50 controls the first gain management module 80 to receiving module
Gain is adjusted.
Further, it is obtained at first when baseband processing module 50 carries out digitized processing to testing result and digital signal
After managing result, if testing result is high level, just need to adjust the gain of corresponding module, therefore, the first gain management module
80 include several gain adjusting circuits, and several gain adjusting circuits connect baseband processing module 50, and connect low noise amplification
Device, the first mixting circuit, the first low-pass filter, the first variable gain amplifier and the first analog-digital converter, for according to the
One testing result and the first processing result are successively to low-noise amplifier, the first mixting circuit, the first variable gain amplifier
Gain is adjusted.Gain adjusting circuit can be PLDO circuit.
Specifically, the first processing result includes two kinds of situations: the first, the first comparison result and the first digital signal carry out
The result of digitized processing；Second, the result of the second comparison result and the first digital signal progress digitized processing.
Further, if it is high level, the first gain that the output of the first saturation detection circuit 401, which is the first comparison result,
Management module 80 reduces the gain of LNA and MIX1 with the first processing result of the first situation according to the first comparison result；If the
The output of two saturation detection circuits 402 is that the second comparison result is high level, then the first gain management module 80 is according to the second ratio
Compared with the gain that the first processing result of result and second situation reduces PGA1.
In actual wireless transceiver, because LNA and MIX1 are often integrated, the first saturation detection circuit
The first mixed frequency signal of 401 detection MIX1, but the first gain management module 80 adjusts the gain of LNA and MIX1；Similarly, because
PGA1 and LPF1 are often integrated, and LPF1 is usually passive device, therefore, the detection of the second saturation detection circuit 402
First filtering signal of LPF1 output, the first gain management module 80 adjust the gain of PGA1.
It should be noted that if the output of the first saturation detection circuit 401 and the second saturation detection circuit 402 is low electricity
It is flat, illustrate that MIX1 and PGA1 do not reach saturation, then baseband processing module 50 just detects the output signal of MIX1 and PGA1
Whether reach the minimum requirement that saturation detection circuit is detected to stop increasing gain if reaching requirement.
In addition, the first saturation detection circuit 401 may further be used to the output signal of detection MIX2, the second saturation detection circuit
402, which may further be used to detection, can be used to detect the output signal of LPF4, the first gain management module 80 may further be used to adjustment MIX2,
The gain of PGA2.
For receiving module, the adjustable gain range of LNA is usually -5~20dB, and the adjustable gain range of MIX is -
The adjustable gain range of 10~5dB, PGA are 0~50dB.The gain stepping length of usually setting receiver is 2dB.
In a specific embodiment, transmitting module 60 includes submodule: the second digital analog converter (DAC2), the 5th low pass
Filter (LPF5), automatic gain control amplifier (AGC), third frequency mixer (MIX3), the 6th low-pass filter (LPF6), function
Rate amplifier (PA).
Wherein, the second digital analog converter is connect with baseband processing module 50, for generating baseband processing module 50
Two digital signal is converted to analog signal.
5th low-pass filter is connect with the second digital analog converter, for being filtered to analog signal, is removed denoising, is obtained
To the 5th filtering signal.
Automatic gain control amplifier is connect with the 5th low-pass filter, for being incited somebody to action according to the demand of baseband processing module 50
5th filtering signal amplifies, and obtains the 4th amplified signal.
Third frequency mixer is connect with automatic gain control amplifier, and connects Fractional-N PLL, for the
Four amplified signals and local oscillated signal carry out frequency translation, and signal and noise are further separated, third mixed frequency signal is obtained.
6th low-pass filter is connect with third frequency mixer, for being filtered to third mixed frequency signal, is further removed
Noise obtains the 6th filtering signal.
Power amplifier is connected between the 6th low-pass filter and Anneta module 10, for the 6th filter signal into
Row amplification, obtains the radiofrequency signal for transmitting, obtained emission of radio frequency signals is gone out by Anneta module 10.
Further, the second saturation detection module 70 includes: third saturation detection circuit 701, the 4th saturation detection circuit
702 and the 5th saturation detection circuit 703.The structure of saturation detection circuit 701,702,703 refers to embodiment one.
Wherein, the input terminal of third saturation detection circuit 701 is connected on the differential signal line of AGC output end, output end
Baseband processing module 50 is connected, for being filtered to the 4th amplified signal that AGC is generated, and filtering signal and third are preset
Parameter is compared, and obtains third comparison result, and exports third comparison result to baseband processing module 50.
The input terminal of 4th saturation detection circuit 702 is connected on two articles of differential signal lines of LPF6 output end, output end
Baseband processing module 50 is connected, for being filtered to the 6th filtering signal that LPF6 is generated, then by filtering signal and the 4th
Parameter preset is compared, and obtains the 4th comparison result, and exports third comparison result to baseband processing module 50.
The input terminal of 5th saturation detection module 703 is connected to the output end of PA, and output end connects baseband processing module 50,
For being filtered to the radiofrequency signal for transmitting that PA is generated, and must by filtered signal and the progress of the 5th parameter preset
It is good, the 5th comparison result is obtained, and export third comparison result to baseband processing module 50.
Specifically, third parameter preset, the 4th parameter preset and the 5th parameter preset are reference voltage VREF, and difference is full
It is different with the reference voltage VREF of detection module.
Specifically, the detection process and saturation detection of 701,702,703 pairs of transmitting module Neutron modules of saturation detection module
The detection process of module 401 and 402 pair receiving module Neutron module is identical, and details are not described herein.
Hold above-mentioned, the second gain management module 90 includes that several gains manage circuit, and several gains manage circuit connection bases
Tape handling module 50, and automatic gain control amplifier, third frequency mixer and power amplifier are connected, for according to the second inspection
It surveys result and the gain of AGC, MIX3 and PA is adjusted in second processing result.Wherein, the second testing result includes third ratio
Relatively result, the 4th comparison result and the 5th comparison result.Second processing result includes three kinds of situations: first, third comparison result
With the digitized processing result of the second digital signal；The digitized processing knot of the second, the four comparison result and the second digital signal
Fruit；Third, the digitized processing result of the 5th comparison result and the second digital signal.
Specifically, it after third saturation detection circuit 701 is filtered comparison to the 4th amplified signal, obtains third and compares knot
Fruit, third comparison result include two kinds of situations of high level and low level；When baseband processing module 50 receives the third of high level
After comparison result, third comparison result and the second digital signal to high level carry out digitized processing and obtain second processing knot
Fruit, then the second gain management module 90 reduces the gain of AGC according to third comparison result and the second processing result.
After baseband processing module 50 receives four comparison result of high level, to the 4th comparison result of high level and
Second digital signal carries out digitized processing and obtains second processing as a result, then the second gain management module 90 compares according to the 4th
As a result the gain of MIX3 is reduced with the second processing result.
It should be noted that the second gain management module 90 is adjusted since the LPF6 after MIX3 is usually passive device
Be MIX3 gain, therefore, the 4th saturation detection circuit 702 may also be arranged between MIX3 and LPF6, detect the defeated of MIX3
The amplitude of oscillation of signal out.
After baseband processing module 50 receives five comparison result of high level, to the 5th comparison result of high level and
Second digital signal carries out digitized processing and obtains second processing as a result, then the second gain management module 90 compares according to the 5th
As a result the gain of PA is reduced with the second processing result.
When third, the four, the 5th comparison results are low level, illustrate that AGC, MIX3, PA do not have and reach saturation, that
Baseband processing module 50 just detects whether the output signal of AGC, MIX3, PA reach the minimum that saturation detection circuit is detected
It is required that stopping increasing gain if reaching requirement.
For transmitting module, the adjustable gain range of AGC is 0~50dB, and the adjustable gain range of MIX is -10~5dB,
The gain of PA is 10~40dB.The gain stepping length of usually setting transmitter is 2dB.
For example, the course of work of the transceiver based on automatic gain management includes two parts: receiving the stage
And launching phase.
In the stage of reception, receiving module 30 initializes the gain of each submodule according to the radiofrequency signal received first,
When the radiofrequency signal of input is too small (the too small amplitude for being primarily referred to as radiofrequency signal and not reaching the smallest discernible signal of signal)
When, the first gain management module 80 first increases the gain of LNA and MIX1, and the synchronous detection of the first saturation detection circuit 401
The output of MIX1；If the testing result of the first saturation detection circuit 401 is high level, the first gain management module 80 is reduced
The gain of LNA and MIX1；If the testing result of the first saturation detection circuit 401 is low level, increase the gain of PGA, simultaneously
Second saturation detection circuit 402 detects the output of PGA1, if the testing result of the second saturation detection circuit 402 is high level,
The gain of first gain management module 80 reduction PGA1；The testing result of second saturation detection circuit 402 is still low level, explanation
The output signal of LNA, MIX1 and PGA1 are undersaturated condition, and baseband processing module 50 detects LNA, MIX1 and PGA1 at this time
Whether output signal, which reaches the minimum of detection, requires, if reaching requirement, just stops increasing gain.
In launching phase, 50 pieces of Base-Band Processing mould the second digital signals generated for transmitting, transmitting module 60 is according to the
Two digital signal initializes the gain of each submodule, and the second gain management module 90 first increases the gain of AGC, third saturation
The amplitude of oscillation of the synchronous detection AGC output signal of detection circuit 701；If the testing result of third saturation detection circuit 701 is high level,
Then the second gain management module 90 reduces the gain of AGC；If the testing result of third saturation detection circuit 701 is low level,
Second gain management module 90 increases the gain of MIX3, while the 4th saturation detection circuit 703 detects the output signal of LPF6
The amplitude of oscillation；If the testing result of the 4th saturation detection circuit 702 is high level, the second gain management module 90 reduces the increasing of MIX3
Benefit；If the testing result of the 4th saturation detection circuit 703 is low level, the second gain management module 90 increases the gain of PA,
The amplitude of oscillation of the PA output signal of 5th saturation detection circuit 703 detection simultaneously；If the testing result of the 5th saturation detection circuit 703 is
High level, then the second gain management module 90 reduces the gain of PA；If the testing result of the 5th saturation detection circuit 703 is low electricity
It is flat, then illustrate that the output signal of AGC, MIX3 and PA are undersaturated condition, baseband processing module 50 detects AGC, MIX3 at this time
It is required with whether the output signal of PA reaches the minimum of detection, if reaching requirement, just stops increasing gain.
In the course of work of above-mentioned transceiver, no matter the stage of reception or launching phase, adjusts each submodule and increase
The priority orders of benefit are the sequence for the submodule that signal transmission is successively passed through；I.e. receive the stage, first adjustment LNA and
The gain of MIX1, then adjust the gain of PGA1；In launching phase, the gain of AGC is adjusted first, then adjusts the gain of MIX, finally
Adjust the gain of PA.
In addition, the stepping of adjust gain, can use binary gain adjustment algorithm, can also use big step gain
10dB is adjusted to be adjusted by small step gain 2dB again, so that the power consumption and performance of transceiver reach
Optimum state.
The embodiment of the present invention by the gain to submodule each in receiving module according to the received sequence of signal successively into
Row is adjusted, and the sequence emitted according to signal the gain of submodule each in transmitting module is successively adjusted, according to certain
Sequence adjusts the gain of receiving module and transmitting module, can make the power consumption of transceiver is orderly to change, make it
Property retention is in optimal value.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (9)
1. a kind of saturation detection circuit characterized by comprising first switch (S1), second switch (S2), the first metal-oxide-semiconductor
(M1), the second metal-oxide-semiconductor (M2), capacitor (C1), resistance (R1) and comparator (A1), wherein
The first end of the first switch (S1) is connected to first input end, and the second end of the first switch (S1) is connected to
The grid of the drain electrode of one metal-oxide-semiconductor (M1) and second metal-oxide-semiconductor (M2)；
The first end of the second switch (S2) is connected to the second input terminal, and the second end of the second switch (S2) is connected to institute
State the drain electrode of the second metal-oxide-semiconductor (M2) and the grid of first metal-oxide-semiconductor (M1)；
The source electrode of first metal-oxide-semiconductor (M1) connects the source electrode of second metal-oxide-semiconductor (M2), and is connected to the comparator
(A1) input terminal；
One end of the capacitor (C1) is connect with the source electrode of the source electrode of first metal-oxide-semiconductor (M1) and second metal-oxide-semiconductor (M2),
And it is connected to the input terminal of the comparator, the other end ground connection of the capacitor (C1)；
One end of the resistance (R1) is connect with the source electrode of the source electrode of first metal-oxide-semiconductor (M1) and second metal-oxide-semiconductor (M2),
And it is connected to the input terminal of the comparator, the other end ground connection of the resistance (R1).
2. a kind of transceiver based on automatic gain management characterized by comprising
Anneta module (10), for receiving and emitting radiofrequency signal；
Frequency synthesis module (20), for providing local oscillated signal；
Receiving module (30) carries out amplified signal and the local oscillated signal for amplifying to the radiofrequency signal
Mixing, then by the signal after mixing after filtering, amplification and analog-to-digital conversion, obtains the first digital signal；
First saturation detection module (40) obtains simultaneously for detecting to the amplitude of oscillation of the receiving module (30) output signal
The first testing result is exported, wherein the first saturation detection module (40) includes that at least one is as described in claim 1 full
And detection circuit；
Baseband processing module (50) is obtained for carrying out digital processing to first testing result and first digital signal
First processing result, and the second digital signal for transmitting is generated, while providing third for the frequency synthesis module (20)
Digital signal is to generate the local oscillated signal；
Transmitting module (60), for carrying out digital-to-analogue conversion, filtering and amplification to second digital signal, by amplified signal
It is mixed with the local oscillated signal, after then the signal after mixing is filtered and is amplified, obtains the radio frequency letter
Number；
Second saturation detection module (70) obtains simultaneously for detecting to the amplitude of oscillation of the transmitting module (60) output signal
The second testing result is exported to the baseband processing module (50), the baseband processing module (50) is to second testing result
Digitized processing is carried out with second digital signal, obtains second processing as a result, wherein the second saturation detection module
It (70) include at least one saturation detection circuit as described in claim 1.
3. the transceiver as claimed in claim 2 based on automatic gain management, which is characterized in that further include:
First gain management module (80) is used for according to first testing result and first processing result to the reception
The gain of module (30) is adjusted；
Second gain management module (90) is used for according to second testing result and the second processing result to the transmitting
The gain of module (60) is adjusted.
4. the transceiver as claimed in claim 3 based on automatic gain management, which is characterized in that the receiving module
(30) include:
Low-noise amplifier obtains the first amplified signal for amplifying to the radiofrequency signal；
First mixting circuit, for will first amplified signal and first phase signal progress frequency translation, obtain the
One mixed frequency signal；
First low-pass filter obtains the first filtering signal for being filtered to first mixed frequency signal；
First variable gain amplifier obtains the second amplified signal for amplifying to first filtering signal；
Second low-pass filter obtains the second filtering signal for being filtered to second amplified signal；
First analog-digital converter, for second filtering signal to be converted to the 4th digital signal；
Second mixting circuit obtains the second mixing letter for the amplified signal and second phase signal to be carried out frequency translation
Number；
Third low-pass filter obtains third filtering signal for being filtered to second mixed frequency signal；
Second variable gain amplifier obtains third amplified signal for amplifying to the third filtering signal；
4th low-pass filter obtains the 4th filtering signal for being filtered to second amplified signal；
Second analog-digital converter, for being converted to the 5th digital signal to the 4th filtering signal.
5. the transceiver as claimed in claim 4 based on automatic gain management, which is characterized in that the first saturation inspection
Surveying module (40) includes:
First saturation detection circuit (401), for being filtered to first mixed frequency signal and by filtered signal and
One parameter preset is compared, and obtains the first comparison result；
Second saturation detection circuit (402), for being filtered to second filtering signal and by filtered signal and
Two parameter presets are compared, and obtain the second comparison result.
6. the transceiver as claimed in claim 4 based on automatic gain management, which is characterized in that first gain tube
Module (80) are managed to be used for according to first testing result and first processing result successively to the low-noise amplifier, institute
The gain for stating the first mixting circuit and first variable gain amplifier is adjusted.
7. the transceiver as claimed in claim 3 based on automatic gain management, which is characterized in that the transmitting module
(60) include:
Second digital analog converter, for second digital signal to be converted to analog signal；
5th low-pass filter obtains the 5th filtering signal for being filtered to the analog signal；
Automatic gain control amplifier obtains the 4th amplified signal for amplifying the 5th filtering signal；
Third frequency mixer obtains third for carrying out frequency translation to the 4th amplified signal and the local oscillated signal
Mixed frequency signal；
6th low-pass filter obtains the 6th filtering signal for being filtered to the third mixed frequency signal；
Power amplifier obtains the radiofrequency signal for transmitting for amplifying to the 6th filtering signal.
8. the transceiver as claimed in claim 7 based on automatic gain management, which is characterized in that the second saturation inspection
Surveying module (70) includes:
Third saturation detection circuit (701), for being filtered to the 4th amplified signal and by filtered signal and
Three parameter presets are compared, and obtain third comparison result；
4th saturation detection circuit (702), for being filtered to the 6th filtering signal and by filtered signal and
Four parameter presets are compared, and obtain the 4th comparison result；
5th saturation detection circuit (703), for being filtered to the radiofrequency signal of transmitting and by filtered signal
It is compared with the 5th parameter preset, obtains the 5th comparison result.
9. the transceiver as claimed in claim 7 based on automatic gain management, which is characterized in that second gain tube
Reason module (90) is for successively putting the automatic growth control according to second testing result and the second processing result
The gain of big device, the third frequency mixer and the power amplifier is adjusted.
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