Successive approximation type analog-to-digital converter based on noise shaping

Abstract

The invention discloses a successive approximation type analog-to-digital converter based on noise shaping. In the successive approximation type analog-to-digital converter, a bootstrap boost sampling switch is adopted for sampling on a capacitive digital-to-analog converter, and a non-binary array is adopted for redundancy calibration; the noise shaping loop comprises a clock control module, a closed-loop dynamic amplifier and a switched capacitor module, the closed-loop dynamic amplifier amplifies the margin voltage after successive approximation, a positive feedback structure is added to improve the response speed, and in the switched capacitor module, the capacitance stacking technology is adopted for collecting, delaying and feeding back margin information to achieve the operation of adding the margin information with a sampling signal. The whole noise transmission function is realized, and the noise shaping effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a successive approximation analog-to-digital converter based on noise shaping. Background technique [0002] The rise of 5G communications and the Internet of Things (IoT) has brought unprecedented connectivity and sensing needs to emerging electronic systems. In addition to stringent requirements for power efficiency, many emerging systems are increasingly demanding higher ADC resolutions. However, in the case of SAR type ADCs, high resolution design becomes very challenging. Although the hardware complexity of a SAR-type ADC remains relatively constant in the medium resolution range (eg, 6-10 bits), its power consumption complexity increases dramatically as the resolution increases. In high-resolution SAR-type ADCs, performance is limited by thermal noise (including comparator noise and sampling kT / C noise) and capacitor mismatch. If these limitations...

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Problems solved by technology

[0006] At present, there are still some problems in the loop in the noise shaping SAR ADC: 1. The active noise shaping SARADC based on the transconductance operational amplifier has strong shaping ability, but the static power consumption is high and the compatibility of process evolution is not good; 2. Passive The noise-shaping SAR-type ADC has simple structure, low power consumption, and good PVT stability, but its noise shaping ability is weak

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