CN208537688U - A kind of volume production test circuit of power amplifier AGC output power - Google Patents
A kind of volume production test circuit of power amplifier AGC output power Download PDFInfo
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- CN208537688U CN208537688U CN201821301777.1U CN201821301777U CN208537688U CN 208537688 U CN208537688 U CN 208537688U CN 201821301777 U CN201821301777 U CN 201821301777U CN 208537688 U CN208537688 U CN 208537688U
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Abstract
The utility model discloses a kind of volume productions of power amplifier AGC output power to test circuit, the first test resistance RDFT1 and first switch S1 are sealed in the input terminal of the first amplifier AMP1, resistance the second test resistance RDFT2 and first switch S1 are sealed in feedback end, wherein, first switch S1 is by EN_MASSTEST control signal control, when power amplifier works normally, it is closed first switch S1, is shorted the first test resistance RDFT1 and the second test resistance RDFT2；When volume production tests the output power of test power amplifier AGC, EN_MASSTEST control signal is lower, and disconnects first switch S1, accesses the first test resistance RDFT1 and the second test resistance RDFT2.It can accurately test to obtain the output power value of AGC only with single-spot testing by the utility model, greatly save the volume production testing time, improve UPH and increase production capacity.
Description
Technical field
The utility model relates to semiconductor integrated circuit technology fields, and more specifically, it relates to a kind of power amplifier AGC outputs
The volume production of power tests circuit.
Background technique
The test of chip volume production is a very great problem, is directly applied in the design of entire chip and the process of volume production
In, after chip package completion, need to test using dedicated automatic test equipment (ATE) chip functions that manufacture and
Whether performance meets design specification requirement.Therefore, the test of chip volume production can include DC parameter test, functional test, mixing letter
Various contents such as number parameter testing, different types of chip have different requirements to test.With chip technology into
It walking, the function of integrating on chip piece becomes increasingly complex, and the test item of chip is also more and more, and the testing time is increasingly longer,
Also mean that the testing expense of chip increases, chip cost increases.
In order to reduce the testing time of chip, improve UPH, increase production capacity, save testing cost, need in the chip portion set
Meter does not influence the test pattern of chip normal work.But with the lightening development of portable device, change of the loudspeaker to power
The requirement for changing range is also higher and higher, it is desirable that the fluctuation range of power amplifier output power central value is limited in ± 10%.If in power amplifier
Output power will lead to speaker damage, belong to the quality accident of reliability beyond limitation range, therefore, all can in design
The corner fluctuation and the fluctuation range of relevant parameter for considering processing technology, the fluctuation range of AGC power central value is limited
Within ± 10%.
Therefore, how volume production test when accurately test out power amplifier AGC performance number, will meet power amplifier AGC power volume production rule
The chip testing of model is picked out, and greatlys save the volume production testing time, improves UPH, is increased production capacity, is those skilled in the art
Urgent problem to be solved.
Utility model content
In view of this, the present invention provides a kind of volume productions of power amplifier AGC output power to test circuit,
To achieve the above object, the utility model provides the following technical solutions:
A kind of volume production test circuit of power amplifier AGC output power, comprising: pre-amplifying module, PWM modulation module and gain
Adjust module, in which:
The pre-amplifying module include: the first amplifier (Amp1), the first feedback resistance (RF1), first capacitor (C1),
First resistor (R1), the first test resistance (RDFT1), the second test resistance (RDFT2) and first switch (S1), described first
The inverting input terminal (-) and positive input (+) of amplifier (Amp1) pass through first test resistance (RDFT1), institute respectively
It states first resistor (R1) and the first capacitor (C1) receives voltage input signal；The first of first amplifier (Amp1) is anti-
Present end and the second feedback end respectively by first feedback resistance (RF1) and second test resistance (RDFT2) with it is described
The inverting input terminal (-) of first amplifier (Amp1) is connected with positive input (+)；The first switch (S1) respectively with it is described
First test resistance (RDFT1) is connected with second test resistance (RDFT2)；The first switch (S1) is by EN_
MASSTEST controls signal control, and the first feedback end and the second feedback end of first amplifier (Amp1) are respectively as described
The first output end and second output terminal of pre-amplifying module；When the output power of the power amplifier AGC is tested in volume production test, institute
State EN_MASSTEST control signal to be lower, disconnect the first switch (S1), access first test resistance (RDFT1) and
Second test resistance (RDFT2)；
The PWM modulation module is used to convert analog signals into pwm signal and carries out the driving of power tube, by the function
The output power for putting AGC is sent to load；
The gain regulation module is used to detect the output voltage of the pre-amplifying module, by the pre-amplifying module
Output voltage be compared with reference voltage, corresponding control code is generated according to comparison result and controls first feedback resistance
(RF1), the comparison result determines the output voltage of first amplifier (Amp1), is carried out by the PWM modulation module
Modulation, limits the output power of the power amplifier AGC.
Further, the PWM modulation module includes: the second amplifier (Amp2), feedback resistance RF2, the second capacitor
(CF2), second resistance (R2), comparator (Comp), PWM modulation circuit (21) and triangular-wave generator (22), in which:
The inverting input terminal (-) and positive input (+) of second amplifier (Amp2) pass through second electricity respectively
Resistance (R2) is connected with the first output end of the pre-amplifying module and second output terminal；Second amplifier (Amp2)
The first output end and the second output terminal inverting input terminal (-) and positive input with second amplifier (Amp2) respectively
(+) is connected；
The first output end and second output terminal of second amplifier (Amp2) respectively with the comparator (Comp)
First input end is connected；Second input terminal of the comparator (Comp) is connected with the triangular-wave generator (22), the ratio
It is connected compared with the output end of device (Comp) with the input terminal of the PWM modulation circuit (21), the output of the PWM modulation circuit (21)
The output end as the PWM modulation module is held to be connected with load；
The output end of the PWM modulation circuit (21) by the feedback resistance RF2 respectively with second amplifier
(Amp2) inverting input terminal (-) is connected with positive input (+).
Further, the gain regulation module includes: that gain adjustment comparator, reference level circuit and addition and subtraction count
Device, in which:
The gain adjustment comparator detects the output voltage of the pre-amplifying module, and receives the reference level electricity
The output voltage of the pre-amplifying module is compared by the reference voltage on road with the reference voltage；
The forward-backward counter generates corresponding control code according to comparison result and controls first feedback resistance
(RF1), the comparison result determines the output voltage of first amplifier (Amp1), passes through second amplifier (Amp2)
The modulation of amplification and the PWM modulation module, limits the output power of the power amplifier AGC.
Further, first amplifier (Amp1) and second amplifier (Amp2) are operational amplifier.
Further, second test resistance (RDFT2) is for reducing compression stepping.
Further, first test resistance (RDFT1) is for making that second test resistance (RDFT2) institute afterwards is added
The gain for stating power amplifier AGC remains unchanged.
It can be seen via above technical scheme that compared with prior art, the utility model discloses a kind of power amplifier AGC outputs
The volume production of power tests circuit, seals in the first test resistance RDFT1 and first switch S1 in the input terminal of the first amplifier AMP1,
Resistance the second test resistance RDFT2 and first switch S1 are sealed in feedback end, wherein first switch S1 is controlled by EN_MASSTEST
Signal control processed is closed first switch S1 when power amplifier works normally, and is shorted the test electricity of the first test resistance RDFT1 and second
Hinder RDFT2；When volume production tests the output power of test power amplifier AGC, EN_MASSTEST control signal is lower, and disconnects first and opens
S1 is closed, the first test resistance RDFT1 and the second test resistance RDFT2 is accessed, wherein the second test resistance RDFT2 is for reducing
Stepping is compressed, so that the sawtooth ripple amplitude very little of AGC compression curve, convenient for the stabilization of power when single-spot testing and accurate, the
For making to be added, entirely the gain of power amplifier remains unchanged one test resistance RDFT1 after the second test resistance RDFT2.It is practical by this
It is novel to test to obtain the output power value of AGC only with single-spot testing and accurately, it greatlys save the volume production testing time, mention
High UPH and increase production capacity.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is the embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also
Other attached drawings can be obtained according to the attached drawing of offer.
Fig. 1 is the volume production test circuit diagram of the traditional power amplifier AGC output power provided in the prior art；
Fig. 2 is the AGC gain compressed waveform figure provided in the prior art；
Fig. 3 is that a kind of volume production of power amplifier AGC output power provided by the embodiment of the utility model tests circuit diagram；
Fig. 4 is that the volume production of power amplifier AGC output power provided by the embodiment of the utility model tests circuit and traditional power amplifier
The AGC compression horsepower of the volume production test circuit of AGC output power compares waveform diagram.
Specific embodiment
In voice applications, the factors such as input signal is excessive or cell voltage declines can all lead to the output of audio-frequency amplifier
Signal distorsion distortion, may also will cause permanent damage to loudspeaker.Therefore, general audio frequency power amplifier is in order to carry out loudspeaker
Protection, while the effect of music is promoted, increase the loudness of music, (claims with dynamic gain adjustment function mostly
For AGC or NCN), similar to the compression function or clipping function in audio effect processing.As shown in Figure 1, increasing in input audio signal
When, the output power of power amplifier increases with it, and when output power is more than the protection threshold power of inner setting, reduces power amplifier automatically
Internal gain, by output power limit at threshold power；When input audio signal reduces, the output power of power amplifier subtracts therewith
It is small, it is automatic to restore power amplifier internal gain when output power is reduced to the release threshold power of inner setting, so that power amplifier is defeated
It is no more than the output power range of setting out.To music signal, the variation within 1dB in general is not easy to discover, because
The compression stepping of this AGC generally can all design within 1dB, usually 0.5dB or so.
In audio frequency power amplifier as shown in Figure 1, AMP1 is pre-amplifier, for adjusting gain；AMP2, R2 and CF2 composition
Integrator；COMP is comparator, and the triangular wave that the output and triangle wave generator for comparing AMP2 generate turns analog signal
It is changed to pwm signal, then by PWM modulation circuit drives power tube, power is transported to loudspeaker end.
Wherein, output VON1 and VOP1 of the gain regulation module by detection AMP1, the base generated with reference level circuit
Quasi- voltage is compared by the gain adjustment comparator in gain regulation module, judges whether gain regulation module starts, and is increased
The forward-backward counter of benefit adjustment module generates corresponding control code and controls first order feedback resistance RF1, and comparative level determines
The output voltage of AMP1, after carrying out second level amplification and PWM modulation circuit by AMP2, to limit the output power of AGC.
It is illustrated in figure 2 the gain compression waveform diagram of AGC in the prior art, when being gain regulation module function
The compression curve of output power and input signal amplitude, wherein abscissa is input signal amplitude (V), and ordinate is output work
Rate size (W).When output signal be greater than window upper edge when, i.e., peak power when, signal start compress 0.5dB, believe at this time
Number continue to increase, AGC recompresses 0.5dB, and AGC be in compressive state, until compression zone of the input signal amplitude greater than AGC
Afterwards, output power just continues linearly to increase.When input signal is less than the lower edge of window, AGC starts to discharge 0.5dB, and gain becomes
Greatly, output signal becomes larger, if input signal continues to reduce, AGC discharges 0.5dB again, and AGC is in release conditions, until input is believed
Number be less than AGC release threshold value when, output power just continues linearly to become smaller.The maximum power of AGC compression process is by the upper of window
Edge determines, is mainly influenced by circuit mismatch.
In the volume production test of power amplifier, AGC output power is most important test index, in Fig. 2 curve, if reference level
The reference voltage that circuit generates changes with technique corner, then compression curve can move up and down；If gain has deviation, song is compressed
Line can move left and right, and therefore, volume production test must accurately test out AGC output power with the variation of technique, it is ensured that output chip symbol
Close the requirement of AGC output power range.
Therefore, it in order to accurately test out AGC output power, needs repeatedly to test AGC output power, then average
The central value of AGC output power is calculated, then power central value is converted into power peak again.Reason for doing so is that:
The compression stepping of AGC is 0.5dB/step, and variation range is 6% for output amplitude, and central value variation is ± 3%, then
Output power variation be ± 6%, and for output power be affected be reference voltage technique corner variation range and
The factors such as the mismatch of resistance, General Influence are ± 5%, if only with single-spot testing, i.e., it is corresponding in certain point of compression curve
Input signal and obtain output power, then the output power value variation range tested be ± 11%, can not accurately test out
The output power of AGC, therefore, traditional test can take the mode repeatedly tested, and then averaged obtains, such as:
8 test points are determined on the compression curve of AGC, then correspond to 8 input signals and 8 output powers, then take 8 output works
The average value of rate obtains power central value, is then converted to power peak.
Although can accurately test out the AGC output power of power amplifier by the way of repeatedly testing, occupies very much and survey
The time is tried, increases very big testing cost, increases chip cost.Such as above-mentioned 8 test modes, the testing time is about
0.8s, test output power more grade, and the testing time increases more.
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
As shown in figure 3, the utility model embodiment provides a kind of volume production test circuit of power amplifier AGC output power, it should
Circuit include: include: pre-amplifying module 1, PWM modulation module 2 and gain regulation module 3, in which:
Above-mentioned pre-amplifying module 1 includes: the first amplifier Amp1, the first feedback resistance RF1, first capacitor C1, first
Resistance R1, the first test resistance RDFT1, the second test resistance RDFT2 and first switch S1, above-mentioned first amplifier Amp1's
Inverting input terminal (-) and positive input (+) respectively by above-mentioned first test resistance RDFT1, above-mentioned first resistor R1 and on
It states first capacitor C1 and receives voltage input signal；The first feedback end and the second feedback end of above-mentioned first amplifier Amp1 leads to respectively
Cross the inverting input terminal of above-mentioned first feedback resistance RF1 and above-mentioned second test resistance RDFT2 Yu above-mentioned first amplifier Amp1
(-) is connected with positive input (+)；Above-mentioned first switch S1 is surveyed with above-mentioned first test resistance RDFT1 and above-mentioned second respectively
Resistance RDFT2 is tried to be connected；Above-mentioned first switch S1 is controlled by EN_MASSTEST control signal, above-mentioned first amplifier Amp1's
The first output end and second output terminal of first feedback end and the second feedback end respectively as above-mentioned pre-amplifying module；In volume production
When the output power of above-mentioned power amplifier AGC is tested in test, above-mentioned EN_MASSTEST control signal is lower, and disconnects above-mentioned first switch
S1 accesses above-mentioned first test resistance RDFT1 and above-mentioned second test resistance RDFT2.In addition, in the above-mentioned normal work of power amplifier AGC
When making, it is closed above-mentioned first switch S1, is shorted above-mentioned first test resistance RDFT1 and above-mentioned second test resistance RDFT2；
Above-mentioned PWM modulation module 2 is used to convert analog signals into pwm signal and carries out the driving of power tube, will be above-mentioned
The output power of power amplifier AGC is sent to load；
Above-mentioned gain regulation module 3 is used to detect the output voltage of above-mentioned pre-amplifying module, by above-mentioned preposition amplification mould
The output voltage of block is compared with reference voltage, generates the above-mentioned first feedback electricity of corresponding control code control according to comparison result
RF1 is hindered, above-mentioned comparison result determines the output voltage of above-mentioned first amplifier Amp1, adjusted by above-mentioned PWM modulation module
System, limits the output power of above-mentioned power amplifier AGC.
As shown in figure 3, above-mentioned PWM modulation module 2 includes: the second amplifier Amp2, feedback resistance RF2, the second capacitor
CF2, second resistance R2, comparator Comp, PWM modulation circuit 21 and triangular-wave generator 22, in which:
The inverting input terminal (-) and positive input (+) of above-mentioned second amplifier Amp2 passes through above-mentioned second resistance respectively
R2 is connected with the first output end of above-mentioned pre-amplifying module and second output terminal；The first of above-mentioned second amplifier Amp2
Output end and second output terminal are connected with the inverting input terminal (-) of above-mentioned second amplifier Amp2 and positive input (+) respectively；
The first output end and second output terminal of the above-mentioned second amplifier Amp2 first input end phase with above-mentioned comparator Comp respectively
Even；The second input terminal of above-mentioned comparator Comp is connected with above-mentioned triangular-wave generator 22, the output end of above-mentioned comparator Comp
It is connected with the input terminal of above-mentioned PWM modulation circuit 21, the output end of above-mentioned PWM modulation circuit 21 is as above-mentioned PWM modulation module
Output end with load be connected；The output end of above-mentioned PWM modulation circuit 21 is by above-mentioned feedback resistance RF2 respectively with above-mentioned second
The inverting input terminal (-) of amplifier Amp2 is connected with positive input (+).
As shown in figure 3, above-mentioned gain regulation module 3 includes: gain adjustment comparator 31, reference level circuit 32 and plus-minus
Method counter 33, in which:
Above-mentioned gain adjustment comparator 31 detects the output voltage of above-mentioned pre-amplifying module 1, and receives said reference electricity
The output voltage of above-mentioned pre-amplifying module 1 is compared by the reference voltage on ordinary telegram road 32 with said reference voltage；It is above-mentioned to add
Subtraction count device 33 generates corresponding control code according to comparison result and controls above-mentioned first feedback resistance RF1, above-mentioned comparison result
The output voltage for determining above-mentioned first amplifier Amp1 passes through above-mentioned second amplifier Amp2 amplification and above-mentioned PWM modulation module
Modulation, limit the output power of above-mentioned power amplifier AGC.
It should be noted that in the utility model embodiment, above-mentioned first amplifier Amp1 and above-mentioned second amplifier
Amp2 is operational amplifier.Above-mentioned second test resistance (RDFT2) is for reducing compression stepping.Above-mentioned first test resistance
(RDFT1) it is remained unchanged for making to be added the gain of above-mentioned power amplifier AGC after above-mentioned second test resistance (RDFT2).
In the utility model embodiment, in switch S1 closure, the compressed waveform of AGC output power is as shown in Fig. 2, every
One step compresses stepping about 0.5dB, compresses the expression formula of stepping are as follows:
Wherein, Rtot,iTotal feedback resistance before indicating the compression of the i-th step, Rtot,i-1For the compressed total feedback of the i-th step
Resistance.If Rtot,i=60kohm, Rtot,i-1=56.5kohm, then compression multiple are as follows: AdB,1=0.52dB, i.e., power amplifier AGC's is defeated
The fluctuation range of power is ± 6.17% out.
When volume production tests the output power of test power amplifier AGC, EN_MASSTEST controls signal and disconnects, by the first test
Resistance RDFT1 and the second test resistance RDFT2 are respectively connected in input resistance string and feedback resistance string, wherein the second test electricity
The effect for hindering RDFT2 is reduction compression stepping, so that the sawtooth ripple amplitude very little of AGC compression curve, when being convenient for single-spot testing
The stabilization of power and accurate；And the effect of the first test resistance RDFT1 is to make entire power amplifier after the second test resistance RDFT2 of addition
Gain remain unchanged.If RDRT=120kohm, Rtoti,=180kohm, Rtot,i-1=176.5kohm, then compression multiple
Are as follows: AdB,1=0.17dB, the i.e. fluctuation range of the output power of power amplifier AGC are ± 1.98%, do not consider that other factors influence, function
Rate test accuracy improves at least 3 times, and the second test resistance RDFT2 can also be further increased to subtract low power fluctuation
Range.The volume production test circuit of the utility model and the AGC compression horsepower comparison waveform of common test circuit are as shown in Figure 4.
The volume production of power amplifier AGC output power provided by the embodiment of the utility model tests circuit, in the first amplifier AMP1
Input terminal seal in the first test resistance RDFT1 and first switch S1, feedback end seal in resistance the second test resistance RDFT2 and
First switch S1, wherein first switch S1 is controlled by EN_MASSTEST control signal, when power amplifier works normally, closure first
Switch S1 is shorted the first test resistance RDFT1 and the second test resistance RDFT2；The output work of test power amplifier AGC is tested in volume production
When rate, EN_MASSTEST control signal is lower, and disconnects first switch S1, accesses the test electricity of the first test resistance RDFT1 and second
Hinder RDFT2, wherein the second test resistance RDFT2 is for reducing compression stepping, so that the sawtooth ripple amplitude of AGC compression curve
Very little, convenient for the stabilization of power when single-spot testing and accurate, the second test resistance is added for making in the first test resistance RDFT1
The gain of entire power amplifier remains unchanged after RDFT2.It can accurately be tested only with single-spot testing by the utility model
To the output power value of AGC, the volume production testing time is greatlyd save, UPH is improved and increases production capacity.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight
Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
It is exemplarily described above in conjunction with the circuit that attached drawing proposes the utility model, the explanation of above embodiments
It is merely used to help understand the core concept of the utility model.For those of ordinary skill in the art, according to the utility model
Thought, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification should not be understood
For limitations of the present invention.
The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new
Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest scope consistent with features of novelty.
Claims (6)
1. a kind of volume production of power amplifier AGC output power tests circuit characterized by comprising pre-amplifying module, PWM modulation
Module and gain regulation module, in which:
The pre-amplifying module includes: the first amplifier (Amp1), the first feedback resistance (RF1), first capacitor (C1), first
Resistance (R1), the first test resistance (RDFT1), the second test resistance (RDFT2) and first switch (S1), first amplification
The inverting input terminal (-) and positive input (+) of device (Amp1) pass through first test resistance (RDFT1), described respectively
One resistance (R1) and the first capacitor (C1) receive voltage input signal；First feedback end of first amplifier (Amp1)
Pass through first feedback resistance (RF1) and second test resistance (RDFT2) and described first respectively with the second feedback end
The inverting input terminal (-) of amplifier (Amp1) is connected with positive input (+)；The first switch (S1) is respectively with described first
Test resistance (RDFT1) is connected with second test resistance (RDFT2)；The first switch (S1) is controlled by EN_MASSTEST
Signal control processed, the first feedback end and the second feedback end of first amplifier (Amp1) are respectively as the preposition amplification mould
The first output end and second output terminal of block；When the output power of the power amplifier AGC is tested in volume production test, the EN_
MASSTEST control signal is lower, and disconnects the first switch (S1), accesses first test resistance (RDFT1) and described the
Two test resistances (RDFT2)；
The PWM modulation module is used to convert analog signals into pwm signal and carries out the driving of power tube, by the power amplifier
The output power of AGC is sent to load；
The gain regulation module is used to detect the output voltage of the pre-amplifying module, by the defeated of the pre-amplifying module
Voltage is compared with reference voltage out, is generated corresponding control code according to comparison result and is controlled first feedback resistance
(RF1), the comparison result determines the output voltage of first amplifier (Amp1), is carried out by the PWM modulation module
Modulation, limits the output power of the power amplifier AGC.
2. circuit according to claim 1, which is characterized in that the PWM modulation module include: the second amplifier (Amp2),
Feedback resistance RF2, the second capacitor (CF2), second resistance (R2), comparator (Comp), PWM modulation circuit (21) and triangular wave
Generator (22), in which:
The inverting input terminal (-) and positive input (+) of second amplifier (Amp2) pass through the second resistance respectively
(R2) it is connected with the first output end and second output terminal of the pre-amplifying module；The first of second amplifier (Amp2)
Output end and second output terminal respectively with the inverting input terminal (-) and positive input (+) phase of second amplifier (Amp2)
Even；
The first output end and second output terminal of second amplifier (Amp2) respectively with the comparator (Comp) first
Input terminal is connected；Second input terminal of the comparator (Comp) is connected with the triangular-wave generator (22), the comparator
(Comp) output end is connected with the input terminal of the PWM modulation circuit (21), and the output end of the PWM modulation circuit (21) is made
It is connected for the output end of the PWM modulation module with load；
The output end of the PWM modulation circuit (21) by the feedback resistance RF2 respectively with second amplifier (Amp2)
Inverting input terminal (-) be connected with positive input (+).
3. circuit according to claim 2, which is characterized in that the gain regulation module includes: gain adjustment comparator, base
Quasi- level circuit and forward-backward counter, in which:
The gain adjustment comparator detects the output voltage of the pre-amplifying module, and receives the reference level circuit
The output voltage of the pre-amplifying module is compared by reference voltage with the reference voltage；
The forward-backward counter generates corresponding control code according to comparison result and controls first feedback resistance (RF1), institute
The output voltage that comparison result determines first amplifier (Amp1) is stated, second amplifier (Amp2) amplification and institute are passed through
The modulation for stating PWM modulation module limits the output power of the power amplifier AGC.
4. circuit according to claim 2, which is characterized in that first amplifier (Amp1) and second amplifier
It (Amp2) is operational amplifier.
5. circuit according to claim 1, which is characterized in that second test resistance (RDFT2) is for reducing compression step
Into.
6. circuit according to claim 1, which is characterized in that first test resistance (RDFT1) is for making described in addition
The gain of the power amplifier AGC remains unchanged after second test resistance (RDFT2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821301777.1U CN208537688U (en) | 2018-08-13 | 2018-08-13 | A kind of volume production test circuit of power amplifier AGC output power |
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| CN201821301777.1U CN208537688U (en) | 2018-08-13 | 2018-08-13 | A kind of volume production test circuit of power amplifier AGC output power |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109031101A (en) * | 2018-08-13 | 2018-12-18 | 上海艾为电子技术股份有限公司 | A kind of volume production test circuit of power amplifier AGC output power |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109031101A (en) * | 2018-08-13 | 2018-12-18 | 上海艾为电子技术股份有限公司 | A kind of volume production test circuit of power amplifier AGC output power |
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