A waveform generation circuit and method based on fpga with adjustable amplitude offset

Abstract

An FPGA-based waveform generation circuit and method with adjustable amplitude bias are widely used in the fields of electronic circuits, automatic control, scientific experiments and the like. The circuit is composed of FPGA, DAC, filter circuit and program-controlled amplifier circuit. The method includes determining a waveform data width and a waveform data range. The upper computer generates a cycle of waveform data and corresponding control words according to the set waveform generation parameters. The host computer transmits the waveform data to the FPGA, and the FPGA stores the obtained waveform data in the waveform RAM. FPGA uses DDS and waveform storage RAM to generate waveforms according to the obtained frequency control word and phase control word. The waveform generated by DDS is controlled by the amplitude adjustment module. Set the offset, and adjust the offset by passing the amplitude-adjusted waveform digital quantity through the adder and subtractor. According to the actual test, the loss of waveform amplitude caused by the frequency effect is determined, and the relationship between the waveform amplitude and frequency is determined, so as to control the program-controlled amplification to compensate the waveform amplitude according to this relationship, so as to ensure the accuracy of the amplitude.

Description

technical field [0001] The invention relates to signal generation technology in the field of electronic technology, in particular to a waveform generation circuit and method based on FPGA with adjustable amplitude bias. Background technique [0002] Waveform generator is a commonly used signal source, widely used in electronic circuits, automatic control and scientific experiments and other fields. With the continuous development of modern electronic technology, the application of waveform generators is becoming more and more extensive, and the requirements are getting higher and higher. Waveform generators are developing toward high precision, high bandwidth, high stability, miniaturization, and low power consumption. High precision refers to the high precision of waveform frequency, amplitude, phase, etc. Miniaturization relies on simplifying external circuitry. The current waveform generation method with adjustable amplitude and offset relies on hardware circuit implem...

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Problems solved by technology

The current waveform generation method with adjustable amplitude and offset relies on hardw

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