Fully-differential programmable standard voltage generation circuit

Abstract

The invention relates to a fully-differential programmable standard voltage generation circuit. The circuit comprises a programmable current mirror, a reference voltage generation circuit and a comparator threshold voltage generation circuit. The programmable current mirror provides current for the reference voltage generation circuit and the comparator threshold voltage generation circuit; the reference voltage generation circuit generates standard output voltage; the comparator threshold voltage generation circuit generates comparator threshold reference voltage. According to the fully-differential programmable standard voltage generation circuit, the programmable current mirror controls the reference voltage generation circuit and the comparator threshold voltage generation circuit, sothat the quantization range is changed without affecting system functions; the fully-differential programmable standard voltage generation circuit is greatly optimized in area, power consumption and precision compared with traditional circuit implementation modes by integrating the reference voltage generating circuit and the comparator threshold voltage generation circuit; the standard voltage generation circuit is of a fully-differential structure, has a low-pass characteristic and a good function of inhibiting noise, even harmonics and high-frequency ripples and is suitable for high-precision analog-to-digital converters and other systems which have high precision requirements.

Description

technical field [0001] The patent of the invention belongs to the field of analog integrated circuit design, and specifically relates to a fully differential programmable reference voltage generation circuit used in a pipeline analog-to-digital converter of a fingerprint sensor chip. Background technique [0002] With the development of mobile Internet technology, handheld mobile devices have gradually penetrated into all aspects of our lives, and information security has attracted more and more attention. As an important means in the field of information security, fingerprint identification technology has become more and more applied. widely. Fingerprint identification chips are more and more widely used in mobile consumer electronic devices, and at the same time, the power consumption and precision requirements of chips are also getting higher and higher. [0003] The current capacitive fingerprint identification system basically consists of a capacitive voltage conversio...

AI Technical Summary

Problems solved by technology

The traditional method is usually to divide the generated quantized reference voltage by resistors, and then provide it to the input terminal of the comparator through a buffer. There are many modules, the power consumption is large, and the accuracy is greatly affected by the resistance matching.

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