Programmable hysteresis comparator

Abstract

The invention relates to an electronic device for realizing hysteresis window width program adjustable of a comparator and improving the flexibility and the universality of the comparator, the window width is adjusted according to an actual demand, and the comparator can be flexibly applied to different environments. A technical scheme adopted by the invention is that a structure of a programmable hysteresis comparator is as follows: transistors M8, M9, M10 and M11 realize the conversion from the differential input to the single-end output, the transistors M5 and M14 provide bias current for a circuit, and two feedback channels are arranged: the first feedback channel is the serial current feedback through a common-source node of the transistors M1 and M2, the serial current feedback is represented as the negative feedback; the second feedback channel is the parallel voltage feedback of the source electrode and the drain electrode of the transistors M6 and M7, and the parallel voltage feedback is the positive feedback. The comparator is mainly applied to the design manufacturing of the electronic device.

Description

technical field [0001] The present invention relates to electronic devices, in particular to comparators in electronic devices, in particular to programmable hysteresis comparators. Background technique [0002] Comparators have been widely used in various circuit designs. In the conversion process of analog signals to digital signals, the input signal needs to be sampled first, and then the digital value of the analog signal is determined by the comparator. In the simplest case Next, the comparator can act as a 1-bit ADC. Typically, a comparator operates in a noisy environment and detects a signal change at a threshold point, and if the comparator is fast enough and the noise amplitude is large enough, there will be noise at its output. In this case, it can be modified by changing the transfer characteristics of the comparator, so hysteresis needs to be introduced in the comparator. Hysteresis is a property of the comparator whose threshold is a function of the input level...

AI Technical Summary

Problems solved by technology

For comparators that require different hysteresis widths, the internal device parameters must be redesigned and adjusted, so the versatility and flexibility are poor

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