Difference frequency device based on operational amplifier

Abstract

The invention discloses three kinds of difference frequency devices based on operational amplifiers. The difference frequency devices based on the operational amplifiers are composed of resistors and the operational amplifiers with low slew rate. According to the three kinds of the difference frequency devices, structures are simple, difference frequency signals which are stable and high in precision can be obtained conveniently, integration is completed easily, and circuit cost is reduced. Gains of the difference frequency devices are easy to change through modification of resistance value of the resistors, amplification management to the difference frequency signals can be achieved through selection of models of the operational amplifiers, and various demands in practical application are met.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a frequency difference device based on an operational amplifier. 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 frequency difference device is serious, and the combined frequency interference is also relatively large, resulting in the instability of the obtained dif...

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Problems solved by technology

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