Low-power consumption and low-distortion signal generator based on direct digital frequency synthetic technology

Abstract

The invention discloses a low-power consumption and low-distortion signal generator based on a direct digital frequency synthetic technology, comprising a programmable logic device, a stage waveform signal generating circuit, a compensating sawtooth waveform signal generating circuit and an addition and subtraction arithmetic device. Based on the direct digital frequency synthetic technology, the programmable logic device respectively outputs a digital amplitude signal of a target waveform signal and a digital amplitude difference signal matched with the digital amplitude signal; then the two signals are synchronously output to the stage waveform signal generating circuit and the compensating sawtooth waveform signal generating circuit; a stage waveform voltage signal Vof and a sawtooth waveform compensating voltage signal Voc which are synchronous to each other on a time domain are output to the addition and subtraction arithmetic device; a sawtooth waveform is compensated through superposition to finally acquire a folding line waveform signal. Without increasing a sampling frequency, the low-power consumption and low-distortion signal generator can acquire signals with lower distortion to solve the conflict between the signal distortion and the sampling frequency in the prior art. The invention is suitable for the application fields where have higher requirements on signal distortion degrees, clock frequencies and power consumption and effectively suppresses stage waveform distortion inevitably brought in the application of direct digital frequency synthetic smooth waveform signals.

Description

technical field

[0001] The invention belongs to the technical field of direct digital frequency synthesis, and it uses analog circuits to compensate conventional signals, which plays a vital role in improving the performance of signal generators. Background technique

[0002] Micromechanical sensors based on silicon sensors are the cutting-edge technology of sensor development today, especially the resonant microsensor technology realized in recent years, which has the advantages of good temperature stability, long-term stability and high sensitivity. At the same time, it also has the unique advantage of direct quasi-digital output signal.

[0003] In the field of resonant microsensor sensitive components and related test instruments, in order to realize the experimental analysis of the dynamic nonlinear characteristics of the resonator itself and the nonlinear characteristics of the electrical link, and at the same time ensure the minimization and low energy consumption of ...

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