Orthogonal signal frequency-multiplication phase-demodulation logic circuit with filter function

Abstract

The invention discloses an orthogonal signal frequency-multiplication phase-demodulation logic circuit with filter function, which mainly comprises a filter circuit module and a frequency-multiplication phase-demodulation circuit module, wherein the filter circuit module consists of eight D triggers, six phase inverters, four three-way AND gates and two JK triggers, an input end of the module receives two paths of orthogonal coding signals needing to be filtered respectively, and an output of the module has two paths of orthogonal signals filtered by the corresponding orthogonal coding signals; and the frequency-multiplication phase-demodulation circuit module consists of two XOR gates and five D triggers, an input end of the module receives two paths of signals needing phase demodulation respectively, and an output end of the module has phase-demodulation signals and fourfold frequency signals. The circuit combines filter and frequency-multiplication phase demodulation, is simple and reliable, can solve the problem of subsequent data processing error caused by signal interference, can be downloaded to a programmable chip such as CPLD or FPGA and the like, saves the space of a circuit board, is convenient to debug, and has reliable performance and utility value.

Description

technical field [0001] The invention relates to a frequency multiplication and phase discrimination circuit in the field of precision servo systems, in particular to a circuit with digital filtering function and frequency multiplication phase discrimination function mainly aimed at quadrature coded signals. Background technique [0002] In the detection link of the servo system, the increment of the rotor rotational position is often obtained from the change in the number of pulses output by the position sensor, and then the rotational angle of the rotor is accurately obtained through the correspondence between the number of pulses and the angle. The higher the accuracy of the sensor, the smaller the angle value corresponding to each pulse, and the more accurate the angle and speed calculation. The quadrature encoder is a high-precision position sensor used to realize the accurate positioning of the position in the servo system, and is often used to detect the position and s...

AI Technical Summary

Problems solved by technology

[0003] However, in the application process of the quadrature encoder, although the signal has been processed in the early stage, in most cases, there will still be noise signal pollution, which seriously affects the accuracy of counting and reduces the control accuracy of the entire system

In modern design, the filtering and frequency multiplication phase detection functions of quadrature encoders, especially the filtering functions are often implemented by hardware circuits. ensure

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