A Noise Shaping Successive Approximation Analog-to-Digital Converter Based on Error Feedback

Abstract

The invention discloses a noise shaping successive approximation analog-to-digital converter based on error feedback. The invention consists of a first core circuit of a positive terminal, a second core circuit of a positive terminal, a first core circuit of a negative terminal, a second core circuit of a negative terminal, a comparator, a logic control and a register module. Positive terminal first core circuit sampling save and feedback V INP , to the comparator output V COM+ , output V to the second core circuit of the positive end RES+ ; Positive second core circuit samples V RES+ , for V INP Feedback V RES+ ; The first core circuit of the negative end is sampled and saved and fed back V INN , to the comparator output V COM‑ , output V to the second core circuit at the negative end RES‑ ; The second core circuit at the negative end samples V RES‑ , for V INN Feedback V RES‑ ; the size of the ; logic control and register block according to the comparator to V COM+ and V COM‑ The judgment result is calculated, and Ctrl is output to the first core circuit of the positive end and the first core circuit of the negative end respectively. + , Ctrl ‑ , output the quantization result. The invention can improve the signal-to-noise ratio and the quantization precision of the analog-to-digital converter, and suppress the frequency band noise.

Description

technical field [0001] The invention relates to an analog-to-digital converter (analog-to-digital converter, ADC) circuit structure, which is suitable for occasions requiring high precision and low power consumption, such as the Internet of Things, wearable devices and biosensors. Background technique [0002] Most of the signals existing in nature are analog signals, such as sound, light, temperature and pressure, etc., while electronic devices such as computers process, calculate, transmit and store mostly digital signals. Therefore, there is a need for an analog-to-digital converter that converts an analog signal into a digital signal, and the analog-to-digital converter plays an irreplaceable and important role in electronic equipment. Especially with the rapid development of related industries such as the Internet of Things, wearable smart products and artificial intelligence, analog-to-digital converters are required to develop in the direction of higher precision, fas...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: it not only solves the problem that the traditional NS-SARADC quantization accuracy is limited by non-ideal factors such as quantization noise, thermal noise and comparator noise, and it is difficult to further obtain higher quantization accuracy, but also solves the problem that the existing NS-SARADC The signal attenuation problem in the noise shaping structure can effectively improve the quantization accuracy of the ADC without consuming too much power consumption

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