Analog to digital conversion circuit and analog to digital conversion method

Abstract

An analog-to-digital conversion circuit and an analog-to-digital conversion method include a reference circuit and an analog-to-digital converter. The reference circuit provides a base voltage with one end connected to ground. The analog-to-digital converter receives an analog input signal and a basic voltage signal. The analog-to-digital converter includes a first DC buffer unit and an analog-to-digital conversion core unit. The first DC buffer unit internally receives a compensation voltage signal and a data voltage signal to be digitized to output two conversion control signals. The analog-to-digital conversion core unit receives the two conversion control signals of the first DC buffer unit and an analog-to-digital conversion input range voltage signal to output a digital code. The aforementioned compensation voltage signal, data voltage signal, and analog-to-digital conversion input range voltage signal are all added to the basic voltage signal.

Description

technical field [0001] The invention relates to an analog-to-digital conversion technology, which can reduce conversion errors caused by changes in technology, voltage, temperature or noise. Background technique [0002] Digital information format is currently a very common way to facilitate data storage or data processing. Taking video electronic devices as an example, it needs to convert analog signals into digital signals for back-end processing. Analog-to-digital conversion circuits are indispensable circuits in digitized electronic devices. [0003] However, since the video-type analog-to-digital converter (ADC) is susceptible to process (process, P) voltage (Voltage, V), temperature (Temperature, T) and noise (noise) changes, The ADC output code (digital code) will produce deviation or wrong result. [0004] figure 1 A block diagram of a conventional analog-to-digital conversion circuit is shown. refer to figure 1 , regarding the operation mechanism of the analog...

AI Technical Summary

Problems solved by technology

[0010] Under the influence of the process, voltage, temperature (PVT) or noise of the above-mentioned analog-to-digital converter 100, the operating voltage or operating current generated by the reference circuit will be affected by it, and then the voltage signals of ADC_VIP and ADC_VIM and the analog-to-digital Switching the input range signal also changes

If the difference between these signals is not consistent, an incorrect digital code will be generated

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