A multi-channel sinusoidal signal generator and multi-channel sinusoidal signal generation method

Abstract

The invention discloses a multi-channel sinusoidal signal generator and a method for generating multi-channel sinusoidal signals, which can directly generate tens or even hundreds of channels of sinusoidal signals, and the amplitude, frequency and initial phase of each signal can be digitally set; All or several channel signals are synchronized, and the phase difference can be set between signals of the same frequency. The waveform generation circuit is composed of a single-chip programmable logic device and multiple analog units; each analog unit is controlled by an amplitude control signal, a phase frequency control signal, and a common fundamental frequency square wave signal; the programmable logic device drives the N-channel analog unit The number of control lines is at least 2N+1. The waveform generation circuit of the present invention does not use memory, DAC, and analog multiplier, but only uses one programmable logic device, N analog multi-way switches, N four op-amps, and N dual op-amps, and the hardware cost is low, and the analog circuit Simple. It is especially suitable for applications that require one or more features such as a large number of channels, channel synchronization, and channel isolation.

Description

(1) Technical field [0001] The invention relates to a multi-channel sinusoidal signal generator, in particular to a multi-channel sinusoidal signal generator with features as high as tens or even hundreds, requiring synchronization and the like. (2) Background technology [0002] The sinusoidal signal generator is the most basic signal generator. Because it can generate sinusoidal signals with variable amplitude, frequency and phase, it is usually used as an excitation source in electronic test systems and is widely used in power system simulation, sonar excitation, In applications such as medical diagnosis, it is necessary to apply multiple sinusoidal signals, and sometimes it is necessary to maintain a synchronous relationship and a certain phase relationship between the signals, which requires the use of a multi-channel sinusoidal signal generator. [0003] The existing multi-channel function / arbitrary waveform generator can be used as a multi-channel sinusoidal signal ge...

AI Technical Summary

Problems solved by technology

If the SPWM signal is directly generated by digital logic, there will be three problems: first, the frequency of the triangle wave generated by digital logic cannot be too high, which directly determines that the frequency of the sinusoidal signal is relatively low. The frequency of the sine signal is lower; second, the state of the SPWM signal will change multiple times within a sine wave cycle, resulting in jitter. When the amplitude is small, the jitter will seriously affect the waveform quality; third, the SPWM signal needs to use a sine wave data, it needs to occupy memory resources, which in turn severely restricts the increase in the number of sinusoidal signal channels

[0005] To sum up, the existing multi-channel signal generation methods and implementation technologies cannot directly generate signals with more than ten channels. When the number of channels increases, multiple programmable logic devices need to work in parallel, which will cause output signals due to different sources of clocks. and the problem of not being able to actually sync

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