Power waveform generator with four-quadrant feedback loop and control method thereof

Abstract

The invention provides a power waveform generator with a four-quadrant feedback loop and a control method thereof, the generator is controlled by a user to respectively output a first control signal and a second control signal through an upper computer and a graphical interface, the first control signal is input into an FPGA + ARM main control board, an instruction is analyzed into a secondary instruction and sent to an auxiliary FPGA, the digital-to-analog converter is controlled to generate a signal after digital-to-analog conversion, and the signal is output to the four-quadrant analog feedback ring to generate an arbitrary waveform signal; the second control signal directly controls the bias adjustment circuit and outputs a proper bias signal to the four-quadrant analog feedback ring; the four-quadrant analog feedback loop superposes the received signals and then outputs voltage and current signals to the digit expansion circuit, further pushes the bootstrap network of the operational amplifier to generate voltage driving waveforms, and further generates power waveforms in any shapes through the push-pull output network.

Description

technical field [0001] The invention relates to the technical field of program-controlled power supplies, and more specifically, to a power waveform generator with a four-quadrant feedback loop and a control method thereof. Background technique [0002] In the measurement of semiconductor and other devices, sometimes in order to meet some special requirements or measure some special indicators, it is often necessary to introduce a special waveform signal in addition to the common DC signal. The common way to do this is often to use a signal generator to generate the required signal, then output the signal to a power amplifier, and then output the signal with power to the device under test. However, this method not only requires a variety of instruments, but also the accuracy of the waveform is often limited by the signal-to-noise ratio of the signal generator and power amplifier itself, and high-speed automated measurement is not used. [0003] In the prior art, there is a ...

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of the existing four-quadrant source-load or source-measure unit is that it can only generate stable DC levels and currents, and the accuracy is not high enough, the noise is relatively large, and it cannot cover functions such as source loads that realize arbitrary power waveforms.

However, there is often a complex contradiction between DC performance and arbitrary waveform performance, which requires more complicated circuit design, technical difficulties, and high cost.

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