CN106571787B - A kind of numerical model analysis automatic gain control amplifier - Google Patents

A kind of numerical model analysis automatic gain control amplifier Download PDF

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CN106571787B
CN106571787B CN201611002678.9A CN201611002678A CN106571787B CN 106571787 B CN106571787 B CN 106571787B CN 201611002678 A CN201611002678 A CN 201611002678A CN 106571787 B CN106571787 B CN 106571787B
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gain
amplifier
automatic gain
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signal
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CN106571787A (en
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王景帅
赵毅强
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Tianjin University
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
    • H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers

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Abstract

本发明公开了一种数模混合自动增益控制放大器，包括两级可变增益单元以及增益控制电路模块，两级可变增益单元包括第一级的可编程增益放大器和第二级的可变增益放大器；数字自动增益控制器由可编程增益放大器、第一峰值检测电路和比较器组成；模拟自动增益控制器由可变增益放大器、第二峰值检测电路、误差放大器、环路滤波器和直流失调消除电路组成；直流失调消除电路用来消除信号中直流分量的偏移。本发明中经过两级的增益调节实现自动增益控制功能，将输出信号Vout的幅值锁定在一个设定电平VREF或者很小的一个范围内。本发明充分结合两种AGC放大器实现方式的优点，实现了较大的增益控制范围和中等带宽，同时有较快的建立时间。

The invention discloses a digital-analog hybrid automatic gain control amplifier, comprising a two-stage variable gain unit and a gain control circuit module. The two-stage variable gain unit includes a first-stage programmable gain amplifier and a second-stage variable gain Amplifier; digital automatic gain controller consists of programmable gain amplifier, first peak detection circuit and comparator; analog automatic gain controller consists of variable gain amplifier, second peak detection circuit, error amplifier, loop filter and DC offset Elimination circuit composition; DC offset elimination circuit is used to eliminate the offset of the DC component in the signal. In the present invention, the automatic gain control function is realized through two-stage gain adjustment, and the amplitude of the output signal Vout is locked within a set level V REF or a very small range. The invention fully combines the advantages of the two AGC amplifier implementations, realizes a larger gain control range and a medium bandwidth, and at the same time has a faster settling time.

Description

A kind of numerical model analysis automatic gain control amplifier
Technical field
The present invention relates to a kind of designs of integrated circuit, and in particular to a kind of automatic gain control amplifier.
Background technique
Automatic growth control (Automatic Gain Control, AGC) amplifier is to change model in input signal amplitude Enclose it is very big in the case where, output signal amplitude is locked within the scope of one of a setting level or very little, thus after being The circuit module of grade provides a stable, optimal input, is applied in the receiver of wireless communication system, to fight Fade-out in radio wave transmissions guarantees that receiver has biggish range of receiving, while having the lower bit error rate.In addition, AGC amplifier is also widely used in the systems such as wire communication, hard disk reading, radar, laser.
AGC amplifier in the prior art can be divided into simulation automatic gain control amplifier and number from implementation Automatic gain control amplifier, continuously adjusting for gain can be realized by simulating automatic gain amplifier, generally use negative feedback control, Need to consider loop stability problem, it is desirable that variable gain amplifier has exponential gain characteristic, and the linearity is poor.It is digital automatic Gain amplifier uses Digital Signals gain, and discrete gain adjusting may be implemented, it is a major advantage that the linearity is good, by Then switch control can accomplish that gain and anticipated deviation are small in taken state.Still yet another advantage is that convenient for digital control, With the digital development trend of integrated circuit, convenient for integrated with digital circuit.But it due to being the gain of discretization, to do Biggish circuit cost is needed to fine gain control.
Summary of the invention
The present invention, for current research hot spot, provides a kind of numerical model analysis automatic growth control amplification in the prior art Device realizes biggish gain control range and Medium-bandwidth, together sufficiently in conjunction with the advantages of two kinds of AGC amplifier implementations When have faster settling time.
In order to solve the above-mentioned technical problem, a kind of numerical model analysis automatic gain control amplifier proposed by the present invention, including Two-stage variable gain unit and gain control circuit module, the two-stage variable gain unit include the programmable increasing of the first order The variable gain amplifier of beneficial amplifier and the second level；It is constituted by the programmable gain amplifier and its gain control circuit One digital resources obtainment device constitutes a simulation automatic gain by the variable gain amplifier and its gain control circuit Controller；The digital resources obtainment device is made of programmable gain amplifier, the first peak detection circuit and comparator； The comparator includes the first hysteresis comparator C1 and the second hysteresis comparator C2；The input of the digital resources obtainment device Signal Vin connects the input of the programmable gain amplifier and the input of first peak detection circuit simultaneously, and described the One peak detection circuit detects the peak value of input signal, and the peak signal of input signal is input to the first hysteresis comparator C1 simultaneously The first reference level Vref 1, institute are terminated with the negative input of the positive input terminal of the second hysteresis comparator C2, the first hysteresis comparator C1 The negative input for stating the second hysteresis comparator C2 terminates the second reference level Vref 2；The peak signal of input signal is slow by first Stagnant comparator C1 is compared compared with the first reference level Vref 1 by the second hysteresis comparator C2 and the second reference level Vref 2 Compared with by the first hysteresis comparator C1 generation control signal D0, control signal D is generated by the second hysteresis comparator C21, the control Signal D0With control signal D1For controlling the gain of the programmable gain amplifier；The simulation automatic gain controller by Variable gain amplifier, the second peak detection circuit, error amplifier, loop filter and DC maladjustment eliminate circuit composition； The DC maladjustment eliminates the offset that circuit is used to eliminate DC component in signal；The input of the simulation automatic gain controller It is connected with the output of the digital resources obtainment device, is input to the signal of the simulation automatic gain controller by number After automatic gain controller pre-amplification, the thin tuning of gain is carried out by the simulation automatic gain controller；The variable increasing The output signal of beneficial amplifier is input to the DC maladjustment and eliminates circuit, and the output signal that the DC maladjustment eliminates circuit is made For the simulation automatic gain controller output signal Vout；The simulation automatic gain controller uses feedback control, Realize fine gain adjustment；The peak of the simulation automatic gain controller output signal Vout is detected by the second peak detection circuit Value, the output signal of second peak detection circuit are input to the negative input end of the error amplifier, external reference level VREFAs the positive input terminal signal of the error amplifier, the error amplifier is defeated by the simulation automatic gain controller The peak value of signal Vout and external reference level V outREFDifference amplification after obtain direct current by the loop filter and increase Benefit control level VC, level V is controlled by DC current gainCThe gain for changing the variable gain amplifier keeps the simulation automatic The peak steady of gain controller output signal Vout is in reference level VREFNear.
Compared with prior art, a kind of beneficial effect of numerical model analysis automatic gain control amplifier provided by the invention is such as Under:
(1) using number, the AGC cascade of two kinds of implementations of simulation, large range of gain control is realized, wherein first Grade increases gain control range for digital AGC for carrying out course gain adjustment, is significantly simplified to original traditional structure, Analog-digital converter and digital control unit are eliminated, it is only adjustable with two 3 grades of gain of comparators realizations, reduce circuit design Complexity.
(2) simulation AGC in the second level realizes the thin tuning of gain, and the gain adjustment fineness for compensating for digital AGC is not high Disadvantage.
(3) gain adjustment Jing Guo the first and second two-stages realizes automatic gain control function, by output signal Vout's Amplitude is locked in a setting level VREFOr within the scope of one of very little.
Detailed description of the invention
Fig. 1 is the AGC amplifier integrated stand composition of the numerical model analysis control in the present invention；
Fig. 2 is the digital control AGC particular circuit configurations figure in the present invention.
Specific embodiment
Technical solution of the present invention is described in further detail in the following with reference to the drawings and specific embodiments, it is described specific Embodiment is only explained the present invention, is not intended to limit the invention.
As shown in Figure 1, a kind of numerical model analysis automatic gain control amplifier proposed by the present invention, including two-stage variable gain Two-stage variable gain unit described in unit and gain control circuit module includes the programmable gain amplifier and of the first order The variable gain amplifier of second level；The automatic increasing of one number is constituted by the programmable gain amplifier and its gain control circuit Beneficial controller constitutes a simulation automatic gain controller by the variable gain amplifier and its gain control circuit.
The digital resources obtainment device by programmable gain amplifier (Programmable Gain Amplifier, PGA), the first peak detection circuit Peak Detector1 and comparator Comparator composition；The digital Auto Gain control The particular circuit configurations of device processed, as shown in Fig. 2, the comparator Comparator includes the first hysteresis comparator C1 and second slow The input signal Vin of stagnant comparator C2, the digital resources obtainment device connect the programmable gain amplifier simultaneously The input of input and first peak detection circuit, the peak value of the first peak detection circuit detection input signal, input The peak signal of signal is input to the positive input terminal of the first hysteresis comparator C1 and the second hysteresis comparator C2 simultaneously, and first is sluggish The negative input of comparator C1 terminates the first reference level Vref 1, the second ginseng of negative input termination of the second hysteresis comparator C2 Examine level Vref2；The peak signal of input signal compared with the first reference level Vref 1, is led to by the first hysteresis comparator C1 The second hysteresis comparator C2 is crossed compared with the second reference level Vref 2, control signal D is generated by the first hysteresis comparator C10, by Second hysteresis comparator C2 generates control signal D1, the control signal D0With control signal D1For controlling the programmable increasing The gain of beneficial amplifier.Such as to realize the gain control range of -20-60dB, the digital Auto Gain control of the first order in the present invention Device processed can design realization 0,20dB, 40dB third gear gain.
The simulation automatic gain controller include variable gain amplifier (Variable Gain Amplifier, VGA), the second peak detection circuit Peak Detector2, error amplifier (Error Amplifier, EA), loop filter Loop Filter, in addition, since there are DC maladjustment phenomenons for variable gain amplifier, by the amplification of tens dB, in output end A very big DC offset voltage can be generated, therefore, the output end in the present invention in the variable gain amplifier is connected with DC maladjustment eliminates circuit (DC Offset Cancellation, DCOC), and the DC maladjustment being added in system is eliminated circuit and used To eliminate the offset of DC component in signal.
As shown in Figure 1, the input and the output of the digital resources obtainment device of the simulation automatic gain controller It is connected, the signal for being input to the simulation automatic gain controller passes through after digital resources obtainment device pre-amplification, by institute State the thin tuning that simulation automatic gain controller carries out gain；The output signal of the variable gain amplifier is input to described straight Offset cancellation circuit is flowed, the output signal that the DC maladjustment eliminates circuit is exported as the simulation automatic gain controller to be believed Number Vout；The simulation automatic gain controller uses feedback control, realizes fine gain adjustment, while in the design will basis The gain step size of digital resources obtainment device reserves certain gain margin, therefore, the second level design gain ranging be- 23-23dB, this grade detect the peak value of the simulation automatic gain controller output signal Vout by the second peak detection circuit, The output signal of second peak detection circuit is input to the negative input end of the error amplifier, external reference level VREF As the positive input terminal signal of the error amplifier, the error amplifier, which exports the simulation automatic gain controller, to be believed The peak value and external reference level V of number VoutREFDifference amplification after by the loop filter obtain a DC current gain control Level V processedC, level V is controlled by DC current gainCThe gain for changing the variable gain amplifier makes the simulation automatic gain The peak steady of controller output signal Vout is in reference level VREFNear.
Gain adjustment in the present invention Jing Guo two-stage realizes automatic gain control function, by output signal (the i.e. described simulation Automatic gain controller output signal Vout) amplitude be locked in a setting level VREFOr within the scope of one of very little.
Although above in conjunction with attached drawing, invention has been described, and the invention is not limited to above-mentioned specific implementations Mode, the above mentioned embodiment is only schematical, rather than restrictive, and those skilled in the art are at this Under the enlightenment of invention, without deviating from the spirit of the invention, many variations can also be made, these belong to of the invention Within protection.

Claims (1)

1.一种数模混合自动增益控制放大器，包括两级可变增益单元以及增益控制电路模块，其特征在于：所述两级可变增益单元包括第一级的可编程增益放大器和第二级的可变增益放大器；由所述可编程增益放大器及其增益控制电路构成了一数字自动增益控制器，由所述可变增益放大器及其增益控制电路构成了一模拟自动增益控制器；1. a kind of digital-analog hybrid automatic gain control amplifier, comprising two-stage variable gain unit and gain control circuit module, it is characterized in that: described two-stage variable gain unit comprises the programmable gain amplifier of the first level and the second level A digital automatic gain controller is formed by the programmable gain amplifier and its gain control circuit, and an analog automatic gain controller is formed by the variable gain amplifier and its gain control circuit; 所述数字自动增益控制器由可编程增益放大器、第一峰值检测电路和比较器组成；所述比较器包括第一迟滞比较器C1和第二迟滞比较器C2；所述数字自动增益控制器的输入信号Vin同时连接所述可编程增益放大器的输入和所述第一峰值检测电路的输入，所述第一峰值检测电路检测输入信号的峰值，输入信号的峰值信号同时输入到第一迟滞比较器C1和第二迟滞比较器C2的正输入端，第一迟滞比较器C1的负输入端接第一参考电平Vref1，所述第二迟滞比较器C2的负输入端接第二参考电平Vref2；输入信号的峰值信号通过第一迟滞比较器C1与第一参考电平Vref1比较，通过第二迟滞比较器C2与第二参考电平Vref2比较，由第一迟滞比较器C1产生控制信号D0，由第二迟滞比较器C2产生控制信号D1，所述控制信号D0和控制信号D1用于控制所述可编程增益放大器的增益；The digital automatic gain controller is composed of a programmable gain amplifier, a first peak detection circuit and a comparator; the comparator includes a first hysteresis comparator C1 and a second hysteresis comparator C2; The input signal Vin is simultaneously connected to the input of the programmable gain amplifier and the input of the first peak detection circuit, the first peak detection circuit detects the peak value of the input signal, and the peak value of the input signal is simultaneously input to the first hysteresis comparator The positive input terminals of C1 and the second hysteresis comparator C2, the negative input terminal of the first hysteresis comparator C1 is connected to the first reference level Vref1, and the negative input terminal of the second hysteresis comparator C2 is connected to the second reference level Vref2 The peak signal of the input signal is compared with the first reference level Vref1 through the first hysteresis comparator C1, and is compared with the second reference level Vref2 through the second hysteresis comparator C2, and the first hysteresis comparator C1 generates the control signal D 0 , a control signal D 1 is generated by the second hysteresis comparator C2, and the control signal D 0 and the control signal D 1 are used to control the gain of the programmable gain amplifier; 所述模拟自动增益控制器由可变增益放大器、第二峰值检测电路、误差放大器、环路滤波器和直流失调消除电路组成；所述直流失调消除电路用来消除信号中直流分量的偏移；所述模拟自动增益控制器的输入与所述数字自动增益控制器的输出相连，输入至所述模拟自动增益控制器的信号经过数字自动增益控制器预放大之后，由所述模拟自动增益控制器进行增益的细调节；所述可变增益放大器的输出信号输入到所述直流失调消除电路，所述直流失调消除电路的输出信号作为所述模拟自动增益控制器输出信号Vout；所述模拟自动增益控制器采用反馈控制形式，实现增益细调；通过第二峰值检测电路检测所述模拟自动增益控制器输出信号Vout的峰值，所述第二峰值检测电路的输出信号输入到所述误差放大器的负输入端，外部参考电平VREF作为所述误差放大器的正输入端信号，所述误差放大器将所述模拟自动增益控制器输出信号Vout的峰值与外部参考电平VREF的差值放大后经过所述环路滤波器得到一个直流增益控制电平VC，通过直流增益控制电平VC改变所述可变增益放大器的增益，使所述模拟自动增益控制器输出信号Vout的峰值稳定在参考电平VREF附近。The analog automatic gain controller is composed of a variable gain amplifier, a second peak detection circuit, an error amplifier, a loop filter and a DC offset elimination circuit; the DC offset elimination circuit is used to eliminate the offset of the DC component in the signal; The input of the analog automatic gain controller is connected to the output of the digital automatic gain controller. After the signal input to the analog automatic gain controller is pre-amplified by the digital automatic gain controller, the analog automatic gain controller is Perform fine adjustment of gain; the output signal of the variable gain amplifier is input to the DC offset elimination circuit, and the output signal of the DC offset elimination circuit is used as the analog automatic gain controller output signal Vout; the analog automatic gain The controller adopts a feedback control form to realize fine adjustment of the gain; the peak value of the output signal Vout of the analog automatic gain controller is detected by a second peak value detection circuit, and the output signal of the second peak value detection circuit is input to the negative of the error amplifier. The input terminal, the external reference level V REF is used as the positive input terminal signal of the error amplifier, and the error amplifier amplifies the difference between the peak value of the output signal Vout of the analog automatic gain controller and the external reference level V REF The loop filter obtains a DC gain control level VC , and changes the gain of the variable gain amplifier through the DC gain control level VC , so that the peak value of the output signal Vout of the analog automatic gain controller is stabilized at the reference value. around the level V REF .
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