CN102468811A - Method and device for controlling low frequency parameters and performance of high speed amplifier - Google Patents
Method and device for controlling low frequency parameters and performance of high speed amplifier Download PDFInfo
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- CN102468811A CN102468811A CN2010105310862A CN201010531086A CN102468811A CN 102468811 A CN102468811 A CN 102468811A CN 2010105310862 A CN2010105310862 A CN 2010105310862A CN 201010531086 A CN201010531086 A CN 201010531086A CN 102468811 A CN102468811 A CN 102468811A
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Abstract
The invention provides a method and a device for controlling low frequency parameters and performance of a high speed amplifier. The control method comprises the following steps of: acquiring a signal required to be amplified, and performing input end signal sampling on the acquired signal required to be amplified; inputting the acquired signal required to be amplified into the high speed amplifier for amplification; performing output end signal sampling on the amplified signal output by the high speed amplifier; and performing analog operation on the sampled output end signal and the sampled input end signal to generate a control signal, and controlling the parameters and the performance of the high speed amplifier according to the control signal. Therefore, the low frequency parameters and performance of a voltage output amplifier and a current output amplifier are optimized.
Description
Technical field
The present invention about the low-frequency parameter property regulation technology of high frequency power amplifier on the signal source analog board, is a kind of high speed amplifier low-frequency parameter and Properties Control method and device particularly about the signal source technical field specifically.
Background technology
In the prior art,, all have good dynamic characteristic, but its low-frequency parameter (DC characteristic) such as high speed devices such as high speed amplifiers, such as temperature waft, characteristic such as noise, offset voltage, offset current is far short of what is expected with respect to the accurate device of some low speed.In order to improve high speed device low-frequency parameter characteristic; Often adopt good device of DC characteristics such as high-accuracy, the low temperature of low speed waft and high speed amplifier to form a negative-feedback circuit; Through the feedback network of high-accuracy device, realize the purpose of the low-frequency parameter improvement of high speed device as high speed device.
Yet there is following drawback in the method for improving high speed device low-frequency parameter characteristic of the prior art: (one) this method mainly is the high speed amplifier to the voltage output type; (2) parameter of regulating feedback network according to the multiplication factor of high speed device dynamically that this method can't be real-time; That is to say that present technology all is to come the design of feedback network to the multiplication factor of some high-frequency amplifiers; In case the multiplication factor of amplifier changes, this feedback network will be ineffective; (3) this method needs the staff to adopt the method (such as regulating slide rheostat etc.) of machinery to go to regulate in the debugging of feedback network; Time-consuming, effort, can't realize accurately regulating and to regulate the result not directly perceived, therefore can not judge well whether this feedback network has adjusted to optimum state.
Summary of the invention
The embodiment of the invention provides a kind of high speed amplifier low-frequency parameter and Properties Control method and device, to realize the low-frequency parameter of voltage output type amplifier and current-output type amplifier and the optimization of combination property.
One of the object of the invention is, a kind of high speed amplifier low-frequency parameter and Properties Control method are provided, and this control method comprises: obtaining needs amplifying signal, and carries out the input end signal sampling the amplifying signal from needing of obtaining; Need amplifying signal to be input to high speed amplifier to amplify with what obtain; From the signal after the amplification of high speed amplifier output, carry out the output end signal sampling; The output end signal of sampling and the input end signal of sampling are carried out simulation trial generation control signal, and the parameter and the performance of high speed amplifier are controlled according to control signal.
One of the object of the invention is; A kind of high speed amplifier low-frequency parameter and Properties Control device are provided; This control device comprises: the signal input-switching circuit, and being used to obtain needs amplifying signal, and carries out the input end signal sampling the amplifying signal from needing of obtaining; High speed amplifier is used for the amplifying signal that needs that obtains is amplified; The signal output switching circuit, the signal that is used for after the amplification of high speed amplifier output carries out the output end signal sampling; The low frequency servo circuit is used for the output end signal of sampling and the input end signal of sampling are carried out simulation trial generation control signal, and according to control signal the parameter and the performance of high speed amplifier is controlled.
The embodiment of the invention can realize the low-frequency parameter of voltage output type amplifier and current-output type amplifier and the optimization of combination property.
The embodiment of the invention can be real-time the parameter of dynamically regulating feedback network according to the multiplication factor of high speed device; That is to say and to go real-time to the multiplication factor of different high-frequency amplifiers; Change the coefficient of feedback network automatically; Under the situation to the multiplication factor of different high frequency power amplifiers, all can realize the low-frequency parameter of high-frequency amplifier and the optimization of combination property automatically; Through the filter in the feedback network, also improved the supply-voltage rejection ratio of whole system greatly simultaneously.
The embodiment of the invention is without mechanical mode; But the mode that adopts keyboard goes digital regulation resistance in the Control and Feedback ring to realize the adjusting of feedback loop parameter through microprocessor; Like this can be not only directly perceived, fast but also carry out the initialization adjustment of circuit easily; Practice thrift manual work, reduced mistake.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, to those skilled in the art; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the embodiment of the invention 1 high speed amplifier low-frequency parameter and Properties Control method flow diagram;
Fig. 2 is the embodiment of the invention 1 high speed amplifier low-frequency parameter and Properties Control apparatus structure block diagram;
Fig. 3 is the embodiment of the invention 1 a low frequency servo circuit structured flowchart;
Fig. 4 is the embodiment of the invention 2 high speed amplifier low-frequency parameters and Properties Control apparatus structure block diagram;
Fig. 5 is the embodiment of the invention 2 low frequency servo circuit theory diagrams;
Fig. 6 has the high speed amplifier low-frequency parameter and the Properties Control apparatus structure block diagram of parameter regulation control circuit for the embodiment of the invention 2;
Fig. 7 is the embodiment of the invention 2 high speed amplifier low-frequency parameters and Properties Control manipulated or operated apparatus.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Embodiment 1
As shown in Figure 1, the high speed amplifier low-frequency parameter and the Properties Control method of present embodiment may further comprise the steps: obtaining needs to carry out input end signal sampling (step S101) the amplifying signal (as: signal that the synthetic DDS chip of Direct Digital produces and the signal that produces from the DDS chip that obtains); The signal that the DDS chip that obtains is produced is input to high speed amplifier and amplifies (step S102); From the signal after the amplification of high speed amplifier output, carry out output end signal sampling (step S103); The output end signal of sampling and the input end signal of sampling are carried out simulation trial generation control signal and according to control signal the parameter and the performance of high speed amplifier controlled (step S104).
The high speed amplifier low-frequency parameter and the Properties Control method of present embodiment also comprise: through gain-adjusted software the gain of described high speed amplifier is regulated.According to the current gain of said high speed amplifier, the output end signal and the input end signal of sampling of taking a sample carried out the corresponding control signal of corresponding simulating computing generation.
The high speed amplifier low-frequency parameter of present embodiment and Properties Control method are the simulation subcards that is used for signal generator; Main purpose is low-frequency parameter and the combination property that is used for regulating the high frequency power amplifier above the analog board, and the overall structure of present embodiment is as shown in Figure 2:
The circuit of realizing the present embodiment method is by A, B, and C, D, five parts of E are formed, and its operation principle is following:
At first when signal generator need be exported significantly signal, the small-signal of the front end that DDS produces just got into A: the signal input-switching circuit; Simultaneously, the signal of entering signal input-switching circuit also gets into D together: the low frequency servo circuit;
The signal of A part gets into B then: high-frequency power amplifying circuit, carry out the amplification of signal; The multiplication factor of this power amplification circuit is not changeless simultaneously, but can be configured and select through software;
Signal by after the high-frequency power amplifying circuit amplification gets into C: the signal output switching circuit;
Through behind the sample circuit, get into D: the low frequency servo circuit by the signal of signal output switching circuit output; The low frequency servo circuit is through will be by A: input signal that the signal input-switching circuit is sent here and C: the signal that the signal output switching circuit is sent here is done after the simulation trial of a series of complicacies; Obtain a control signal; This control signal is input to B again as a feedback output regulation signal: high-frequency power amplifying circuit, thus reached purpose to the real-time regulated of the output of high frequency power amplifier and performance;
Because the multiplication factor of high-frequency power amplifying circuit can be by software control and selection; And some low-frequency parameters of high-frequency power amplifying circuit are closely-related to the multiplication factor of high-frequency power amplifying circuit Effect on Performance and high-frequency power amplifying circuit; In case so B: after the multiplication factor of high-frequency power amplifying circuit has taken place to change; Our D: the parameter of low frequency servo circuit also need be done corresponding adjusting; At this time we just rely on E: the relevant parameter of low frequency servo circuit is controlled and regulated to digitlization parameter regulation and control circuit according to the variation of high-frequency power amplifying circuit multiplication factor, thereby make the performance of high-frequency amplifier circuit under any circumstance all reach optimum.
As shown in Figure 3, the operation principle of low frequency servo circuit and digitlization parameter regulation and control circuit is following:
(1) the low frequency servo circuit is to play the computing of analog quantity and relatively effect, cooperates digitlization parameter regulation and control circuit to play the low-frequency parameter of high frequency power amplifier and the automation adjustment of whole synthesis performance.
(2) the concrete effect of digitlization parameter regulation and control circuit is exactly according to the high frequency power amplifier different magnifications; Through B among Fig. 2: digital control circuit and; D: the cooperation of microprocessor realizes revising corresponding analog parameter; The relevant parameter of low frequency servo circuit is controlled and regulated to realization according to the variation of high-frequency power amplifying circuit multiplication factor, thereby make the performance of high-frequency amplifier circuit under any circumstance all reach optimum.
At first the final signal of high frequency power amplifier output is as the input signal of C circuit; The C circuit carries out after the differential sample to it; Through an operational amplifier it is transformed to the signal of single-ended output, this output signal gets into B: the artificial circuit part of digital control circuit, this digital control circuit are a high accuracy in fact; The digital regulation resistance that low temperature wafts, the control of this digital regulation resistance resistance value are through D: microprocessor carries out communication through the I2C interface; Signal partly enters into A by B then: the analog-integrating computing circuit; This circuit will be done an integral operation by B signal that partly gets into and the input signal that inputs to high frequency power amplifier; The end value that integral operation obtains is a magnitude of voltage; This magnitude of voltage remakes the input signal that road input signal for high frequency power amplifier removed and inputed to high frequency power amplifier and does computing in high frequency power amplifier inside, and final the realization realizes optimizing and the purpose of improving to high frequency power amplifier low-frequency parameter and combination property.In addition: this low frequency servo circuit and high-frequency power amplifying circuit have constituted a typical negative-feedback circuit together; Because degenerative existence is arranged; And our servo circuit, and the analogue device of digital control circuit the inside adopts all is high accuracy, the device that low temperature wafts; So can utilize negative feedback to realize that our high frequency power amplifier can have high bandwidth; It is high-accuracy simultaneously to possess low frequency again, and the advantage that low temperature wafts device has realized the improvement and the optimization of high frequency power amplifier low-frequency parameter and combination property.
Embodiment 2
As shown in Figure 4; The high speed amplifier low-frequency parameter and the Properties Control device of present embodiment comprise: signal input-switching circuit 101; Being used to obtain needs amplifying signal (as: signal that the synthetic DDS chip of Direct Digital produces), and from the signal that the DDS chip that obtains produces, carries out the input end signal sampling; High speed amplifier 102 is used for the signal that the DDS chip that obtains produces is amplified; Signal output switching circuit 103, the signal that is used for after the amplification of high speed amplifier output carries out the output end signal sampling; Low frequency servo circuit 104 is used for the output end signal of sampling and the input end signal of sampling are carried out simulation trial generation control signal, and according to described control signal the parameter and the performance of high speed amplifier is controlled.
As shown in Figure 5, low frequency servo circuit 104 comprises: output sampling and amplification filtering circuit 1041 are used for the output end signal of sampling is transformed to single-ended output signal; Digital control circuit 1042 is used to regulate the current potential of said single-ended output signal; Microprocessor 1044 is used for according to described parameter regulation signal described digital control circuit being controlled; Analog-integrating computing circuit 1043 is used for the output end signal of sampling is carried out the corresponding control signal of corresponding simulating integral operation generation with the input end signal of sampling.Digital control circuit comprises: digital regulation resistance.Microprocessor comprises: keyboard.
As shown in Figure 6; The high speed amplifier low-frequency parameter and the Properties Control device of present embodiment comprise: signal input-switching circuit 101; Be used to obtain the signal that the synthetic DDS chip of Direct Digital produces, and from the signal that the DDS chip that obtains produces, carry out the input end signal sampling; High speed amplifier 102 is used for the signal that the DDS chip that obtains produces is amplified; Signal output switching circuit 103, the signal that is used for after the amplification of high speed amplifier output carries out the output end signal sampling; Low frequency servo circuit 104 is used for the output end signal of sampling and the input end signal of sampling are carried out simulation trial generation control signal, and according to described control signal the parameter and the performance of high speed amplifier is controlled; Parameter regulation control circuit 105; Be used for generating the parameter regulation signal according to the current gain of high speed amplifier, the low frequency servo circuit carries out corresponding simulating computing to the output end signal of taking a sample with the input end signal of sampling according to the parameter regulation signal and generates corresponding control signal.High speed amplifier is the variable gain high speed amplifier, is used for according to the amplifier gain of gain-adjusted software adjustment.
As shown in Figure 7, introduce the circuit structure of apparatus of the present invention in conjunction with the present embodiment manipulated or operated apparatus, the annexation between each parts, work relationship, operation principle are following:
In Fig. 7; By resistance R 9039 the output signal of high-frequency power amplifying circuit is sampled, high-frequency power amplifying circuit output is current signal in the middle of signal generator, is that voltage signal is (to the signal of other types so need a sampling resistor with its current conversion; Work equally such as this low frequency servo circuit of voltage signal; Only need revise the form of sample circuit a little), then through amplifier U905B and circuit R9056, R9057; R9040; R9058, R9059, the amplifying circuit of R9041 and capacitor C 9056 and the single-ended output of difference input commentaries on classics that capacitor C 9058 constitutes carries out the amplification of differential-to-single-ended conversion and realization signal to signal;
Get into a digital regulation resistance U906 through the circuit after amplifying then; This digital regulation resistance is to be disposed by a FPGA above the analog card; Because it is incompatible that FPGA gets the level of output level and digital regulation resistance, at this moment just need to use resistance R9090, R9091 and triode Q914; Q915 realizes the conversion of a level, to guarantee digital regulation resistance U906 and FPGA communication smoothly;
Must satisfy a fixing relation between the resistance R 9011 of the input signal entering servo circuit end of value that digital regulation resistance U906 connects with resistance R 9055 and input power amplifier and the R9054; This relation is closely related with the multiplication factor of high-frequency power amplifying circuit again; So can be different values, make the value of digital regulation resistance U906 and resistance R 9055 series connection and import and under different high frequency power multiplication factors, all satisfy such fixed relationship (computing formula 1 when bias voltage is 0) between resistance R 9011 and the R9054 of input signal entering servo circuit end of power amplifier through regulating with the configuration digital regulation resistance:
Wherein, V
In: the signal of input radio frequency power amplifier;
A
Amp: the voltage amplification factor of radio frequency power amplifier;
R
Sample: be sample resistance R9039;
A
Diff: the difference that is made up of amplifier U905B is changeed the voltage amplification factor of single-end circuit;
Last signal is realized the integral operation to sampled signal and input signal through an integrating circuit of being made up of amplifier U905A and capacitor C 9068; The integration output of this circuit is as the regulation voltage of high-frequency power amplifying circuit; Input signal with high-frequency power amplifying circuit gets into high-frequency power amplifying circuit; What the analogue device of servo circuit and digital control circuit the inside adopted all is high accuracy; The device that low temperature wafts, so can utilize negative feedback to realize that our high frequency power amplifier can have high bandwidth, it is high-accuracy to possess low frequency again simultaneously; The advantage that low temperature wafts device has realized the improvement and the optimization of high frequency power amplifier low-frequency parameter and combination property.
The capacitor C 9056 that has added filtering in the circuit the inside of Fig. 7, C9058 when choosing this filter capacitor and constituting the integrating capacitor C9068 of integrating circuit, must be noted that supply voltage.When the amplifying circuit amplifying signal, the amplitude of output signal is big more, and the electric current of power amplifier output is big more, so just means that the electric current that power amplifier obtains from power supply is just big, and particularly this phenomenon is obvious especially when signal frequency is lower; When signal frequency is higher (＞=100KHZ); The fluctuation of the voltage that the fluctuation owing to load current like this causes can compensate through big filter capacitor; But when frequency is lower (such as＜=100HZ), big filter capacitor is also powerless, therefore; Here through setting C9056; C9058, the capacitance that C9068 is different, thus make servo circuit have certain bandwidth (bandwidth is about 100KHZ) just can utilize servo circuit in passing the corresponding compensation effect to be played in the fluctuation of supply voltage like this.
The embodiment of the invention adopts negative-feedback technology; Utilize high-accuracy; Low temperature drift; Low noise device has been realized the low-frequency parameter of high frequency power amplifier (generally the temperature of this class A amplifier A is waftd, characteristics such as offset voltage, offset current, noise are not fine) (temperature is waftd, offset voltage, offset current, noise) is improved, and has improved its combination property and index;
The embodiment of the invention is utilized digital regulation resistance and the cooperation of microprocessor and the ingenious design that combines analog circuit, has realized under the different amplification of high frequency power amplifier the improvement of regulating its low-frequency parameter automatically and realizing its combination property;
The embodiment of the invention has designed filter circuit cleverly, and not only low-frequency parameter is well improved, and amplifier is also insensitive to the fluctuation of supply voltage, has improved the supply voltage of high frequency power amplifier greatly and has prevented ratio.
Used specific embodiment among the present invention principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
1. high speed amplifier low-frequency parameter and Properties Control method is characterized in that described control method comprises:
Obtaining needs amplifying signal, and carries out the input end signal sampling the amplifying signal from needing of obtaining;
Need amplifying signal to be input to high speed amplifier to amplify with what obtain;
From the signal after the amplification of said high speed amplifier output, carry out the output end signal sampling;
The output end signal of sampling and the input end signal of sampling are carried out simulation trial generation control signal, and the parameter and the performance of said high speed amplifier are controlled according to described control signal.
2. method according to claim 1 is characterized in that, described method also comprises: through gain-adjusted software the gain of described high speed amplifier is regulated.
3. method according to claim 2 is characterized in that, described method also comprises: according to the current gain of said high speed amplifier, the output end signal and the input end signal of sampling of taking a sample carried out the corresponding control signal of corresponding simulating computing generation.
4. high speed amplifier low-frequency parameter and Properties Control device is characterized in that described control device comprises:
The signal input-switching circuit, being used to obtain needs amplifying signal, and carries out the input end signal sampling the amplifying signal from needing of obtaining;
High speed amplifier is used for the amplifying signal that needs that obtains is amplified;
The signal output switching circuit, the signal that is used for after the amplification of said high speed amplifier output carries out the output end signal sampling;
The low frequency servo circuit is used for the output end signal of sampling and the input end signal of sampling are carried out simulation trial generation control signal, and according to described control signal the parameter and the performance of said high speed amplifier is controlled.
5. device according to claim 4 is characterized in that described high speed amplifier is the variable gain high speed amplifier, is used for according to the amplifier gain of gain-adjusted software adjustment.
6. device according to claim 5; It is characterized in that; Described device also comprises: the parameter regulation control circuit; Be used for generating the parameter regulation signal according to the current gain of said high speed amplifier, described low frequency servo circuit carries out corresponding simulating computing to the output end signal of taking a sample with the input end signal of sampling according to described parameter regulation signal and generates corresponding control signal.
7. device according to claim 6 is characterized in that, described low frequency servo circuit comprises:
Output sampling and amplification filtering circuit are used for the output end signal of sampling is transformed to single-ended output signal;
Digital control circuit is used to regulate the current potential of said single-ended output signal;
Microprocessor is used for according to described parameter regulation signal described digital control circuit being controlled;
The analog-integrating computing circuit is used for the output end signal of sampling is carried out the corresponding control signal of corresponding simulating integral operation generation with the input end signal of sampling.
8. device according to claim 7 is characterized in that described digital control circuit comprises: digital regulation resistance.
9. device according to claim 7 is characterized in that described microprocessor comprises: keyboard.
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| CN201010531086.2A CN102468811B (en) | 2010-11-03 | 2010-11-03 | A kind of high speed amplifier low-frequency parameter and Properties Control method and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199825A (en) * | 2013-03-02 | 2013-07-10 | 山东交通学院 | Method and circuit for regulating and controlling DDS output signal amplitudes based on DCPs |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1260634A (en) * | 1999-01-08 | 2000-07-19 | 松下电器产业株式会社 | Automatic gain controlling method and apparatus |
| US20050047533A1 (en) * | 2003-08-26 | 2005-03-03 | Ruelke Charles R. | Receiver with automatic gain control that operates with multiple protocols and method thereof |
| CN101150299A (en) * | 2006-09-19 | 2008-03-26 | 联发科技股份有限公司 | Circuits and methods for signal gain control |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1260634A (en) * | 1999-01-08 | 2000-07-19 | 松下电器产业株式会社 | Automatic gain controlling method and apparatus |
| US20050047533A1 (en) * | 2003-08-26 | 2005-03-03 | Ruelke Charles R. | Receiver with automatic gain control that operates with multiple protocols and method thereof |
| CN101150299A (en) * | 2006-09-19 | 2008-03-26 | 联发科技股份有限公司 | Circuits and methods for signal gain control |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199825A (en) * | 2013-03-02 | 2013-07-10 | 山东交通学院 | Method and circuit for regulating and controlling DDS output signal amplitudes based on DCPs |
| CN103199825B (en) * | 2013-03-02 | 2015-07-01 | 山东交通学院 | Method and circuit for regulating and controlling DDS output signal amplitudes based on DCPs |
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