Comparator Circuits for Analog-to-Digital Converters

A technology of analog-to-digital converter and comparison circuit, applied in analog/digital conversion, code conversion, instruments, etc., can solve problems such as difficulty in increasing integral voltage, large integral voltage, limited integral voltage of analog circuit, etc., to reduce input offset The effect of voltage, high precision, and low power consumption
CN104283566BActive Publication Date: 2018-06-26CHINA RESOURCES MICROELECTRONICS (CHONGQING) CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA RESOURCES MICROELECTRONICS (CHONGQING) CO LTD
Publication Date
2018-06-26

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Abstract

The invention provides a comparison circuit for an analog-digital converter. The comparison circuit comprises a first operational amplifier, a first detuning calibration capacitor, a second detuning calibration capacitor, a second operational amplifier, a comparator and a regeneration latch. According to the comparison circuit, higher precision and low power consumption can be acquired on the premise that the performance requirement for an original comparator is met, the input detuning voltage of the comparator is effectively reduced, and the comparison circuit can be applied to circuits of SAR type ADC converters and other analog-digital converters.
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Description

Technical field

[0001] The invention belongs to the field of integrated circuit design, and in particular relates to a comparison circuit for analog-to-digital converters. Background technique

[0002] Analog-to-digital converter (abbreviated as A / D converter or ADC) refers to an electronic device that converts an analog quantity into a digital quantity. The usual A / D converter collects analog voltage signals from the signal system, and after signal processing, converts the analog voltage signals into equivalent digital voltage signals. The most important performance indicators of A / D converters are conversion accuracy (abbreviated as accuracy) and conversion speed (abbreviated as speed). Accuracy represents the relative error between the actual value of the analog voltage and its corresponding digital value, which can be expressed as "trueness". In A / D converters, resolution and conversion error are usually used to describe conversion accuracy. Resolution refers to the number...

Claims

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