A High Output Amplitude Difference Frequency Converter Based on Logarithmic Amplifier

Abstract

The invention discloses a high-output amplitude difference frequency indicator based on a log amplifier. The other end of a first resistor is respectively connected with the positive pole of a first diode and the negative pole of a second diode, the negative pole of the first diode is connected with the positive pole of a third diode, and the negative pole of a 2n-3 diode is connected with the positive pole of a 2n-1 diode. The positive pole of the second diode is connected with the negative pole of a fourth diode, and the positive pole of a 2n-2 diode is connected with the negative pole of a 2n diode. The negative pole of the 2n-1 diode and the positive pole of the 2n diode are connected with an output end of an operational amplifier at the same time to output difference frequency signal voltage. The positive pole of the first diode is connected with one end of a capacitor, and the other end of the capacitor is connected with the negative pole of the 2n-1 diode. The other end of a second resistor is respectively connected with the positive pole of the first diode, the negative pole of the second diode and the negative polarity input end of the operational amplifier. The high-output amplitude difference frequency indicator based on the log amplifier is simple in structure, stable, high-precision and high-amplitude difference frequency signals can be conveniently acquired, and dynamic ranges of the signals are enlarged.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a logarithmic amplifier-based high-output amplitude difference frequency converter. Background technique [0002] The frequency difference device is a nonlinear device, and the frequency of the output signal is equal to the difference between the frequencies of the two input signals. The frequency difference devices in the prior art are usually diode frequency difference devices, balanced frequency difference devices and transistor frequency difference devices, all of which are composed of inductors and transformers. [0003] In the process of realizing the present invention, the inventor finds that at least the following disadvantages and deficiencies exist in the prior art: [0004] 1) The mutual influence between the circuits of the above-mentioned frequency difference device is serious, and the combined frequency interference is also relatively large, resulting in the in...

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Problems solved by technology

[0004] 1) The mutual influence between the circuits of the above-mentioned frequency difference device is serious, and the combined frequency interference is also relatively large, resulting in the instability of the obtained difference frequency signal and the low amplitude of the output difference frequency signal;

[0005] 2) The above-mentioned difference frequency converter is greatly affected by the discreteness of component parameters, and the dynamic range of the signal that can be processed is small;

[0006] 3) The obtained difference frequency signal is an attenuated signal with low sensitivity, which is difficult to meet various needs in practical applications

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