CN105137169B - A kind of RF power sensing circuit - Google Patents
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Abstract
本发明公开了一种低射频功率检测电路，该检测电路将射频输入信号连接至匹配负载，然后经过基于检波二极管的峰值检测电路处理，峰值检测电路的输出连接至峰值补偿电路，使得补偿之后的直流电平与射频信号峰值基本一致。补偿电路的输出连接至乘法器的两个输入端，乘法器的输出经滤波、放大、零位补偿之后，在检测电路输出端得到一个与待测信号功率成正比的直流信号。该发明的特点是：各功能电路相对独立，调试方便；补偿电路可精细调节，在一定频率和功率范围内测量准确度较高；通过设定电路参数，响应速度灵活可调；能满足高达几百毫瓦的射频信号功率测量，有较好的实用价值和应用前景。
The invention discloses a low radio frequency power detection circuit. The detection circuit connects the radio frequency input signal to a matching load, and then processes it through a peak detection circuit based on a detection diode. The output of the peak detection circuit is connected to a peak compensation circuit, so that the compensated The DC level is basically consistent with the peak value of the RF signal. The output of the compensation circuit is connected to the two input terminals of the multiplier. After the output of the multiplier is filtered, amplified and zero-position compensated, a DC signal proportional to the power of the signal to be tested is obtained at the output terminal of the detection circuit. The characteristics of the invention are: each functional circuit is relatively independent, and debugging is convenient; the compensation circuit can be finely adjusted, and the measurement accuracy is high within a certain frequency and power range; 100 milliwatts of radio frequency signal power measurement has good practical value and application prospect.
Description
技术领域technical field
本发明涉及加速器和射频离子源领域中的中频至甚高频频段的低射频功率检测，更具体地，涉及一种基于检波二极管的低射频功率检测电路。The present invention relates to low radio frequency power detection in the medium frequency to very high frequency band in the field of accelerators and radio frequency ion sources, and more specifically relates to a low radio frequency power detection circuit based on a detection diode.
背景技术Background technique
射频表示可以辐射到空间的电磁频率，中频至甚高频所涵盖的频率范围是300kHz～300MHz，目前该频段内低射频功率检测采用的主要技术如下：Radio frequency refers to the electromagnetic frequency that can be radiated into space. The frequency range from intermediate frequency to very high frequency is 300kHz to 300MHz. At present, the main technologies used for low radio frequency power detection in this frequency band are as follows:
1、采用高速二极管作为检波器对射频信号功率进行检测，如图1所示，输入信号在经过二极管检波之后，输出射频信号的包络。由于实际中二极管并不能工作在理想状态，也就是当输入波形在负半周时，二极管并不能完全关断；以及在正半周期间，输入波形的瞬时值小于二极管的完全导通电压的情形下，二极管工作状态具有不确定性，导致该种检测方法的检测精度和准确度十分有限。1. Using a high-speed diode as a detector to detect the power of the radio frequency signal, as shown in Figure 1, after the input signal is detected by the diode, the envelope of the radio frequency signal is output. Since the diode does not work in an ideal state in practice, that is, when the input waveform is in the negative half cycle, the diode cannot be completely turned off; and in the positive half cycle, the instantaneous value of the input waveform is less than the full conduction voltage of the diode. The working state of the diode is uncertain, which leads to very limited detection precision and accuracy of this detection method.
2、利用MOS管，或者双结型晶体管(BJT)的非线性工作特性，完成功率检测，如图2所示。晶体管对输入信号进行一个半波整流的处理，再将处理之后的信号经过滤波，得到最终的检测电平信号，以此判断最初输入信号的功率大小情况。这种方法的缺陷在于，单纯的晶体管整流结构在输入信号为零的时候，输出端电平并不为零。并且，由于晶体管本身的温度特性所引入的影响，最终得到的功率检测的测量曲线的线性性质往往不能让人满意。2. Utilize the non-linear working characteristics of MOS transistors or bijunction transistors (BJTs) to complete power detection, as shown in FIG. 2 . The transistor performs a half-wave rectification process on the input signal, and then filters the processed signal to obtain the final detection level signal, so as to judge the power of the initial input signal. The defect of this method is that the pure transistor rectification structure has a non-zero output level when the input signal is zero. Moreover, due to the influence introduced by the temperature characteristics of the transistor itself, the linearity of the finally obtained measurement curve of the power detection is often unsatisfactory.
3、采用高度集成的对数放大器或者均方根检波器芯片，例如AD8318/AD8307/ADL5501等，来检测射频信号的幅度或者功率，如图3所示。这类检测方法由于采用了以现有的、集成度较高的检波芯片为主体的检测结构，检测的信号功率的动态范围十分有限，检测的特性曲线的斜率也比较固定，当待测信号的功率超出了一个很小的范围之后，检测结果就会达到饱和，从而失去可信度。3. Use a highly integrated logarithmic amplifier or RMS detector chip, such as AD8318/AD8307/ADL5501, to detect the amplitude or power of the radio frequency signal, as shown in Figure 3. Since this kind of detection method adopts the detection structure based on the existing and highly integrated detection chip, the dynamic range of the detected signal power is very limited, and the slope of the detected characteristic curve is relatively fixed. After the power exceeds a small range, the detection results will be saturated, thus losing credibility.
4、采用引入额外的硬件设备进行功率检测的方法，比如采用均匀排列的电压探头结合电流探头的方法，对传输线上两个方向的射频功率分别进行采样和计算、检测的方法；以及，采用特定工艺条件下热氧化物的厚度与射频功率大小的关系，通过获得前者的值推断出射频功率的方法等。这些方法大都结构复杂，造价成本比较高，维护也比较困难。4. Use the method of introducing additional hardware equipment for power detection, such as the method of using uniformly arranged voltage probes combined with current probes to sample, calculate and detect the RF power in two directions on the transmission line; and, using specific The relationship between the thickness of the thermal oxide and the radio frequency power under the process conditions, the method of inferring the radio frequency power by obtaining the former value, etc. Most of these methods are complex in structure, relatively high in cost, and difficult to maintain.
发明内容Contents of the invention
本发明所要解决的技术问题是，一般的基于检波二极管的射频功率检测技术存在一定频率、功率范围内检测精度不够高的问题。为提高一定频率、功率范围内射频功率检测精度，本发明在基于检波二极管的峰值检测电路基础上，增设了峰值补偿和零位补偿电路，大大提高了功率检测精度。The technical problem to be solved by the present invention is that the detection accuracy in a certain frequency and power range is not high enough in the general detection diode-based radio frequency power detection technology. In order to improve the detection accuracy of radio frequency power within a certain frequency and power range, the present invention adds peak compensation and zero compensation circuits on the basis of the detection diode-based peak detection circuit, which greatly improves the power detection accuracy.
本发明提出的一种射频功率检测电路，包括负载匹配单元、峰值检测单元、峰值补偿单元、乘法器单元、低通滤波单元、放大单元，其特征在于它们依序串联，信号从负载匹配单元输入，从放大单元输出，其中所述负载匹配单元用于和前级之间的阻抗匹配；峰值检测单元为二极管检波电路，用于信号包络检测；峰值补偿单元用于补偿峰值检测单元的非线性误差；低通滤波单元用于滤除信号中的高频成分；乘法器单元用于对检测信号作平方处理；放大单元用于将检测信号放大和输出。A radio frequency power detection circuit proposed by the present invention includes a load matching unit, a peak detection unit, a peak compensation unit, a multiplier unit, a low-pass filter unit, and an amplification unit, which are characterized in that they are connected in series in sequence, and the signal is input from the load matching unit , output from the amplification unit, wherein the load matching unit is used for impedance matching with the previous stage; the peak detection unit is a diode detection circuit for signal envelope detection; the peak compensation unit is used to compensate the nonlinearity of the peak detection unit error; the low-pass filter unit is used to filter out high-frequency components in the signal; the multiplier unit is used to square the detection signal; the amplification unit is used to amplify and output the detection signal.
本发明中，输入的待测射频功率信号首先经过负载匹配单元，再通过基于检波二极管和无源网络构成的峰值检测单元提取出信号峰值，然后送入峰值补偿单元，对峰值检测单元中检波二极管正向导通压降进行补偿；将峰值补偿单元的输出作为乘法器单元的两路输入。将乘法器单元的运算结果经过低通滤波单元处理，再通过放大单元进行放大，最后将经过上述处理之后的信号送入零位补偿单元对信号进行补偿，以抵消检测电路输出端的静态电压漂移，从而最终得到与待测射频信号的功率成正比的直流电平信号。In the present invention, the input radio frequency power signal to be tested first passes through the load matching unit, then extracts the peak value of the signal through the peak detection unit based on the detection diode and the passive network, and then sends it to the peak compensation unit, and the detection diode in the peak detection unit The forward voltage drop is compensated; the output of the peak compensation unit is used as two inputs of the multiplier unit. The operation result of the multiplier unit is processed by the low-pass filter unit, and then amplified by the amplification unit, and finally the signal after the above processing is sent to the zero compensation unit to compensate the signal, so as to offset the static voltage drift at the output of the detection circuit. Thus, a DC level signal proportional to the power of the radio frequency signal to be measured is finally obtained.
进一步的，所述的检测电路的峰值补偿单元对基于检波二极管的峰值检测单元输出信号进行补偿。该补偿单元以运放为主体结构，通过在运放输出端和反向输入端连接一个反向二极管和小电阻串联的结构，使得峰值补偿单元的输出信号，获得一个与峰值检测单元中二极管正向压降大小相等的电位提升，实现补偿的效果。值得注意的是，峰值补偿单元采用的反向二极管和峰值检测单元所采用的二极管型号和参数完全相同，这样能很好的克服二极管的温度特性和频率特性给检测精度带来的不利影响；同时还值得注意的是，因为流经前面的峰值检测单元的二极管和峰值补偿单元的二极管的电流不同，为了进一步补偿信号通过前面的峰值检测单元的二极管所带来的压降，本发明还提出了采用了在补偿回路上与二极管串联的电阻的方式，使得补偿之后的直流电平信号与待测射频信号的峰值相等，从而进一步提高了本射频峰值功率检测电路的准确性。Further, the peak compensation unit of the detection circuit compensates the output signal of the peak detection unit based on the detection diode. The compensation unit takes the operational amplifier as the main structure, and connects a reverse diode and a small resistor in series between the output terminal of the operational amplifier and the reverse input terminal, so that the output signal of the peak compensation unit obtains a positive signal that is equal to that of the diode in the peak detection unit. Boost to the potential with the same voltage drop to achieve the effect of compensation. It is worth noting that the type and parameters of the reverse diode used in the peak compensation unit and the peak detection unit are exactly the same, which can well overcome the adverse effects of the temperature and frequency characteristics of the diode on the detection accuracy; at the same time It is also worth noting that, because the current flowing through the diode of the peak detection unit and the diode of the peak compensation unit are different, in order to further compensate the voltage drop caused by the signal passing through the diode of the peak detection unit in front, the present invention also proposes The resistor connected in series with the diode on the compensation loop makes the compensated DC level signal equal to the peak value of the RF signal to be measured, thereby further improving the accuracy of the RF peak power detection circuit.
进一步的，所述的检测电路的放大单元附加有零位补偿单元，该零位补偿单元包括正负补偿电源、可调电阻器Rzero和固定电阻R13、R14和R15，可调电阻器Rzero的两端分别与正负补偿电源相接，其中心抽头通过R15与放大单元的反相输入端相连；同时，放大单元的反相输入端通过R13、R14与正负补偿电源相接；通过调节可调电阻中心抽头位置，零位补偿单元能提供一个正负可调的电平，抵消前级电路所引入的零漂电平，特别是乘法器输出的零漂电平，从而在一定程度上较好的克服了乘法器本身零点漂移缺陷。当没有待测射频信号输入时，实现检测电路输出端为零的效果，进一步提高功率检测精度。Further, the amplifying unit of the detection circuit is additionally equipped with a zero compensation unit, which includes a positive and negative compensation power supply, an adjustable resistor R zero and fixed resistors R 13 , R 14 and R 15 , and the adjustable resistor The two ends of R zero are respectively connected to the positive and negative compensation power supply, and its center tap is connected to the inverting input of the amplifying unit through R 15 ; at the same time, the inverting input of the amplifying unit is connected to the positive and negative compensating through R 13 and R 14 The power supply is connected; by adjusting the center tap position of the adjustable resistor, the zero compensation unit can provide a positive and negative adjustable level to offset the zero drift level introduced by the previous circuit, especially the zero drift level output by the multiplier , thus better overcome the defect of zero drift of the multiplier itself to a certain extent. When no radio frequency signal to be tested is input, the effect that the output end of the detection circuit is zero is realized, and the power detection accuracy is further improved.
进一步的，所述的检测电路的峰值检测单元包括检波二极管和RC无源网络单元，通过设定该RC无源网络中的器件参数，能调节射频功率检测电路的工作响应速度。Further, the peak detection unit of the detection circuit includes a detection diode and an RC passive network unit, and by setting device parameters in the RC passive network, the working response speed of the radio frequency power detection circuit can be adjusted.
进一步的，所述的检测电路的放大单元的电压放大倍数能够调整和设定，使得功率输出保持适当范围，应用更加灵活、方便。Further, the voltage magnification of the amplifying unit of the detection circuit can be adjusted and set, so that the power output can maintain an appropriate range, and the application is more flexible and convenient.
进一步的，所述的检测电路的峰值补偿单元的反向检波二极管支路上还串有一个电阻，能更精确地补偿峰值检测单元产生的电压误差，提高检测精度。Further, a resistor is connected in series with the reverse detection diode branch of the peak compensation unit of the detection circuit, which can more accurately compensate the voltage error generated by the peak detection unit and improve the detection accuracy.
本发明中，输入检测电路的待测信号可来自定向耦合器的耦合输出、信号源或低功率放大器的输出。在正式使用之前，需采用高精度功率计标定可调功率信号发生器的输出，然后将标定好的信号发生器输出连接至该检测电路，从而对该检测电路输出电平进行标定，得到输入功率与直流输出电平的线性关系表达式。待标定完成之后，将实际待测射频信号作为本发明检测电路的输入，得到输出电平，带入上述表达式进行计算，即可得到实际待测射频信号的功率大小。In the present invention, the signal to be tested input into the detection circuit may come from the coupling output of the directional coupler, the signal source or the output of the low power amplifier. Before formal use, it is necessary to use a high-precision power meter to calibrate the output of the adjustable power signal generator, and then connect the calibrated signal generator output to the detection circuit to calibrate the output level of the detection circuit to obtain the input power. The expression of the linear relationship with the DC output level. After the calibration is completed, the actual radio frequency signal to be tested is used as the input of the detection circuit of the present invention to obtain the output level, which is brought into the above expression for calculation, and the power of the actual radio frequency signal to be tested can be obtained.
本发明将峰值补偿单元的输出信号作为乘法器的两路输入，而不是直接将射频信号自身相乘，或者是将射频信号与另一个已知频率的信号相乘，从而在一定程度上克服了干扰信号对检测精度的影响。The present invention uses the output signal of the peak compensation unit as the two inputs of the multiplier, instead of directly multiplying the radio frequency signal itself, or multiplying the radio frequency signal with another signal of a known frequency, thus to a certain extent overcomes the The influence of interference signal on detection accuracy.
本发明引入了峰值补偿单元，对经过基于检波二极管的峰值检测单元处理之后的信号进行补偿；引入了零位补偿单元，对静态输出的零漂电平进行抵消。本发明所述的射频功率检测电路提高了传统的基于检波二极管的射频功率检测精度，能够满足高达几百毫瓦的中频至甚高频频段的射频功率检测要求。The invention introduces a peak compensation unit to compensate the signal processed by the detection diode-based peak detection unit; introduces a zero compensation unit to offset the static output zero drift level. The radio frequency power detection circuit of the present invention improves the traditional radio frequency power detection accuracy based on detection diodes, and can meet the radio frequency power detection requirements of the intermediate frequency to very high frequency band up to hundreds of milliwatts.
附图说明Description of drawings
图1是现有技术中采用二极管作为检波单元对射频信号功率进行检测的基本原理图；Fig. 1 is the basic schematic diagram of using a diode as a detection unit to detect radio frequency signal power in the prior art;
图2是现有技术中采用N型双结型晶体管对射频信号进行功率检测的基本原理图；2 is a basic schematic diagram of power detection of radio frequency signals using N-type bijunction transistors in the prior art;
图3是现有技术中基于Analog Devices公司生产的RMS功率检波芯片ADL5501对射频信号进行功率检测的基本原理图；图中，芯片ADL5501的各个引脚分别为：VPOS-芯片供电电压引脚、FLTR-滤波引脚、RFIN-射频信号输入引脚、COMM-公共接地引脚、ENBL-使能端引脚、VRMS-检测信号输出引脚；Fig. 3 is the basic schematic diagram of the power detection of radio frequency signals based on the RMS power detection chip ADL5501 produced by Analog Devices in the prior art; in the figure, each pin of the chip ADL5501 is: VPOS-chip power supply voltage pin, FLTR -Filter pin, RFIN-RF signal input pin, COMM-common ground pin, ENBL-enable terminal pin, VRMS-detection signal output pin;
图4是本发明所述的射频功率检测电路原理图；Fig. 4 is a schematic diagram of a radio frequency power detection circuit of the present invention;
图5是本发明中零位补偿单元的电路图；Fig. 5 is the circuit diagram of zero compensation unit among the present invention;
图6是本发明的一个实施实例。Fig. 6 is an implementation example of the present invention.
在所有附图中，相同的附图标记用来表示相同的元件或结构，其中：1-阻抗匹配单元，2-峰值检测单元，3-峰值补偿单元，4-乘法器单元，5-低通滤波单元，6-放大单元，7-零位补偿单元。In all the drawings, the same reference numerals are used to represent the same elements or structures, wherein: 1-impedance matching unit, 2-peak detection unit, 3-peak compensation unit, 4-multiplier unit, 5-low pass Filter unit, 6-amplification unit, 7-zero compensation unit.
具体实施方式detailed description
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本发明，并不用于限定本发明。In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
如图4所示的本发明射频峰值功率检测方法原理图中，本发明所述的射频峰值功率检测电路中，信号流程为：In the principle diagram of the radio frequency peak power detection method of the present invention as shown in Figure 4, in the radio frequency peak power detection circuit of the present invention, the signal flow is:
1.待测信号经过负载匹配单元后，进入峰值检测单元；1. After the signal to be tested passes through the load matching unit, it enters the peak detection unit;
2.峰值检测单元的输出经峰值补偿单元进行补偿处理；2. The output of the peak detection unit is compensated by the peak compensation unit;
3.峰值补偿单元的输出作为乘法器单元的两路输入，实现乘法运算；3. The output of the peak compensation unit is used as two inputs of the multiplier unit to realize multiplication;
4.乘法器单元的输出信号经过低通滤波单元处理；4. The output signal of the multiplier unit is processed by a low-pass filter unit;
5.低通滤波器的输出经放大单元处理，最终得到与射频信号功率成正比的直流电平信号。5. The output of the low-pass filter is processed by the amplification unit, and finally a DC level signal proportional to the power of the radio frequency signal is obtained.
此外，通过附加的零位补偿单元，能抵消电路的静态输出电位的漂移，进一步提高检测精度。In addition, through the additional zero position compensation unit, the drift of the static output potential of the circuit can be offset to further improve the detection accuracy.
如图6所示是本发明的一个的实施例的电路示意图。详细来说，如图4所示的本发明的原理结构的具体实施方式可如图6所示。在阻抗匹配单元1中，电阻R1和R2并联，一端接地，另一端和待测信号的输入相连接。阻抗匹配单元的输出与峰值检测单元2的电阻R3一端相连，R3的另一端与检波二极管D1的正极相连。电容C1和电阻R4并联构成的无源网络的一端接地，另一端与上述检波二极管D1的负极相连。As shown in FIG. 6 is a schematic circuit diagram of an embodiment of the present invention. In detail, a specific implementation of the principle structure of the present invention as shown in FIG. 4 may be shown in FIG. 6 . In the impedance matching unit 1, resistors R1 and R2 are connected in parallel, one end is grounded, and the other end is connected to the input of the signal to be measured. The output of the impedance matching unit is connected to one end of the resistor R3 of the peak detection unit 2, and the other end of R3 is connected to the anode of the detection diode D1. One end of the passive network formed by the parallel connection of the capacitor C1 and the resistor R4 is grounded, and the other end is connected to the cathode of the detection diode D1.
峰值检测单元2的输出端连接到峰值补偿单元中电阻R5的一端，R5的另一端连接到峰值补偿单元3中的运放的同相输入端，实例中峰值补偿单元2的采用的运放芯片型号是LF412。电阻R7的一端接地，另一端与上述运放的反向输入端相连。与D1同型号同参数的二极管D2的负极性端与上述运放的反向输入端相连，D2的正极性端与电阻R8的一端相连，R8的另一端与上述运放的输出端连接。正负15V的电平分别与上述运放的正负供电端相连，同时分别连接到电容C2和C3的一端，电容C2和C3的另一端都接地。这样的连接方式就构成了峰值补偿单元3，完成了对峰值的一个补偿，使得在峰值补偿单元3的输出位置获得一个与待测信号峰值基本相等的电平信号。The output terminal of the peak detection unit 2 is connected to one end of the resistor R5 in the peak compensation unit, and the other end of R5 is connected to the non-inverting input terminal of the op amp in the peak compensation unit 3, and the model of the op amp chip used in the peak compensation unit 2 in the example It is LF412. One end of the resistor R7 is grounded, and the other end is connected to the inverting input end of the operational amplifier. The negative terminal of the diode D2 with the same model and parameters as D1 is connected to the reverse input terminal of the above-mentioned operational amplifier, the positive terminal of D2 is connected to one end of the resistor R8, and the other end of R8 is connected to the output terminal of the above-mentioned operational amplifier. The positive and negative 15V levels are respectively connected to the positive and negative power supply terminals of the operational amplifier, and at the same time are respectively connected to one end of the capacitors C2 and C3, and the other ends of the capacitors C2 and C3 are both grounded. Such a connection constitutes the peak compensation unit 3 , which completes a compensation for the peak value, so that a level signal substantially equal to the peak value of the signal to be measured is obtained at the output position of the peak compensation unit 3 .
上述峰值补偿单元的输出同时作为两路相同的输入连接到乘法器单元4中乘法器芯片的两路输入管脚8和管脚1，其中本实例采用的乘法器芯片的型号为AD835；芯片的管脚7和管脚2以及管脚4都接地。正负5V电平分别连接到乘法器芯片的正负供电引脚6和引脚3，引脚6和引脚3还分别和电容C5和电容C4的一端连接，电容C5和电容C4的另一端都接地。乘法器的运算结果由管脚5输出，也就是乘法器单元4的输出。The output of the above-mentioned peak compensation unit is connected to the two input pins 8 and pin 1 of the multiplier chip in the multiplier unit 4 as two identical inputs at the same time, wherein the model of the multiplier chip adopted in this example is AD835; Pin 7 and pin 2 and pin 4 are all connected to ground. The positive and negative 5V levels are respectively connected to the positive and negative power supply pin 6 and pin 3 of the multiplier chip, and pin 6 and pin 3 are also connected to one end of capacitor C5 and capacitor C4 respectively, and the other end of capacitor C5 and capacitor C4 All grounded. The operation result of the multiplier is output by the pin 5 , that is, the output of the multiplier unit 4 .
乘法器单元4的输出和低通滤波单元5中的电阻R9的一端相连，电阻R9的另一端和电容C6相连，同时这里作为低通滤波单元5的输出，电容C6的另一端接地。The output of the multiplier unit 4 is connected to one end of the resistor R9 in the low-pass filter unit 5, and the other end of the resistor R9 is connected to the capacitor C6, which is used as the output of the low-pass filter unit 5, and the other end of the capacitor C6 is grounded.
低通滤波单元5的输出与电阻R10的一端相连，R10的另一端与放大单元6中的运放的反向输入端相连，实施例中放大单元6的采用的运放芯片型号是TL072。电阻R11的一端与该运放的同相输入端相连，R11的另一端接地。同时，电阻R12一端连接到该运放的反向输入端，R12的另一端连接到该运放的输出。类似的，正负15V电平分别和该运放芯片的正负电源引脚相连，同时还分别和电容C7和电容C8的一端相连，电容C7和电容C8的另一端都接地。这样以来就完成了对低通滤波单元5输出信号的放大。The output of the low-pass filter unit 5 is connected to one end of the resistor R10, and the other end of R10 is connected to the reverse input end of the operational amplifier in the amplifying unit 6. The operational amplifier chip model of the amplifying unit 6 in the embodiment is TL072. One end of the resistor R11 is connected to the non-inverting input end of the operational amplifier, and the other end of the R11 is grounded. Meanwhile, one end of the resistor R12 is connected to the inverting input end of the operational amplifier, and the other end of R12 is connected to the output of the operational amplifier. Similarly, the positive and negative 15V levels are respectively connected to the positive and negative power supply pins of the operational amplifier chip, and are also connected to one end of the capacitor C7 and capacitor C8 respectively, and the other ends of the capacitor C7 and capacitor C8 are both grounded. In this way, the amplification of the output signal of the low-pass filter unit 5 is completed.
上述放大单元6中的运放的输出端与电阻R16的一端相连，电阻R16的另一端与零位补偿单元7的运放的反向输入端相连。电阻R17的一端与上述运放的同相输入端相连，R17的另一端接地。电阻R18的一端与上述运放的反向输入端相连，R18的另一端与可调电位器R19的一个固定端相连，R19的另一个固定端与其调节端相连，同时还和上述运放的输出端相连。零位调节单元6中，正负5V电平分别与电阻R13和电阻R14的一端相连，电阻R13和电阻R14的另一端连到一起，再和上述零位补偿单元7的运放的反向输入端相连。同时正负5V电平还分别和电位器Rzero的两个固定端相连，电位器的调节端与电阻R15的一端相连，R15的另一端与上述运放的反向输入端相连。这样的连接方式就构成了零位补偿单元7，通过改变电位器Rzero的调节旋钮，就可以给上述运放的反向输入端提供一个小范围的正负可调的电平，再经过上述运放的放大作用之后，就能够用来补偿前述的乘法器单元4输出端口的零漂电平。上述零位补偿单元7中的运放的输出端为零位补偿单元的输出，同时也是整个检测电路的输出。The output terminal of the operational amplifier in the amplifying unit 6 is connected to one end of the resistor R16 , and the other end of the resistor R16 is connected to the inverting input terminal of the operational amplifier of the zero compensation unit 7 . One end of the resistor R17 is connected to the non-inverting input end of the operational amplifier, and the other end of the R17 is grounded. One end of the resistor R18 is connected to the reverse input terminal of the above-mentioned operational amplifier, the other end of R18 is connected to a fixed terminal of the adjustable potentiometer R19, and the other fixed terminal of R19 is connected to its adjustment terminal, and is also connected to the output of the above-mentioned operational amplifier. end connected. In the zero adjustment unit 6, the positive and negative 5V levels are respectively connected to one end of the resistor R13 and the resistor R14, and the other end of the resistor R13 and the resistor R14 are connected together, and then connected to the reverse input of the operational amplifier of the above zero compensation unit 7 end connected. At the same time, the positive and negative 5V levels are also connected to the two fixed ends of the potentiometer Rzero respectively, the adjustment end of the potentiometer is connected to one end of the resistor R15, and the other end of R15 is connected to the inverting input end of the above-mentioned operational amplifier. This connection mode constitutes the zero compensation unit 7. By changing the adjustment knob of the potentiometer Rzero, a small range of positive and negative adjustable levels can be provided to the reverse input terminal of the above-mentioned operational amplifier. After the amplification function of the amplifier, it can be used to compensate the zero drift level of the output port of the aforementioned multiplier unit 4 . The output terminal of the operational amplifier in the above-mentioned zero compensation unit 7 is the output of the zero compensation unit and also the output of the entire detection circuit.
按照上述的连接方式，就构成了本实施例所述的射频功率检测电路，就能够在检测电路输出端得到一个与输入信号的功率成正比的检测电平信号，该检测电平信号位于0-10V之间，精度合适，便于测量；由该检测信号的大小，经过计算，即可得到待测射频信号的功率大小。According to the above-mentioned connection mode, the radio frequency power detection circuit described in this embodiment is formed, and a detection level signal proportional to the power of the input signal can be obtained at the output end of the detection circuit, and the detection level signal is located between 0- Between 10V, the accuracy is appropriate and easy to measure; the power of the radio frequency signal to be tested can be obtained through calculation based on the magnitude of the detection signal.
本领域的技术人员容易理解，以上所述仅为本发明的一个实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。It is easy for those skilled in the art to understand that the above description is only one embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention are all Should be included within the protection scope of the present invention.
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| CN111880000B (en) * | 2020-08-12 | 2023-06-23 | 常州瑞思杰尔电子科技有限公司 | Radio frequency power supply pulse power detection circuit |
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| CN113533845B (en) * | 2021-07-06 | 2023-03-31 | 加特兰微电子科技(上海)有限公司 | On-chip radio frequency power meter, chip, radio device and electronic equipment |
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| CN114487984B (en) * | 2022-03-10 | 2025-06-24 | 北京北方华创微电子装备有限公司 | Calibration device and method for radio frequency power supply |
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