Charge-coupled pipeline analog-to-digital converter with digital background calibration

Abstract

The invention provides a charge coupling production line analog-digital converter having a digital background calibration function. The charge coupling production line analog-digital converter comprises a charge coupling sampling retaining circuit, a pseudorandom modulating production line sublevel circuit based on a charge coupling signal processing technology, a N-1th-level production line sublevel circuit based on the charge coupling signal processing technology, a N+1th-level N-bitFlash analog-digital converter, a pseudorandom code generating circuit, a background error correction module, a background error estimation module, an averaging module, a reference signal generating circuit and a clock signal generating circuit. The charge coupling production line analog-digital converter can automatically detect errors caused by temperature and voltage fluctuation after a circuit of the charge coupling production line analog-digital converter with a fully differential structure works, calibrate the errors, control the influence within the lowest-resolution-ratio requirement of the analog-digital converter so as to overcome the accuracy limiting problem caused by the errors caused by various non-ideal characteristics to an existing charge coupling production line analog-digital converter and further improve the conversion accuracy.

Description

technical field [0001] The invention relates to a pipeline analog-to-digital converter, in particular to a charge-coupled pipeline analog-to-digital converter with various error calibration functions. Background technique [0002] With the continuous development of digital signal processing technology, the digitization and integration of electronic systems is an inevitable trend. However, most signals in reality are continuously changing analog quantities, which need to be transformed into digital signals through analog-to-digital conversion before they can be input into digital systems for processing and control. Therefore, analog-to-digital converters are indispensable in future digital system design. made of. In applications such as broadband communications, digital high-definition television, and radar, systems require analog-to-digital converters with both very high sampling rates and resolutions. Portable terminal products in these application fields require not only...

AI Technical Summary

Problems solved by technology

However, when the patented technology ends the calibration mode and enters the normal working mode for a period of time, the error caused by temperature and voltage fluctuations cannot be calibrated, and such errors will be directly superimposed on the output result, affecting the conversion accuracy of the analog-to-digital converter.

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