Charge-compensation-based reference technique for switched-capacitor ADCs

Author

Ya Wang ; Fule Li ; Chunying Xue ; Zhihua Wang

Author_Institution

Tsinghua Nat. Lab. for Inf. Sci. & Technol., Tsinghua Univ., Beijing, China

fYear

2015

fDate

24-27 May 2015

Firstpage

2257

Lastpage

2260

Abstract

This paper presents an enhanced voltage reference for Switched-Capacitor ADCs. Charge losing effect is analyzed and quantized. Charge-Compensation-Based (CCB) technique is introduced to reduce the signal-dependent effect. Charge Compensation Unit (CCU) is designed to compensate charge. It features in low overhead on power and chip-size. A proof-of-principle CCB reference design for a 12-bit 500MS/s pipelined ADC is implemented. Simulation results show at least 3dB SNDR and 10dB SFDR improvement achieved, with input sweeping from low frequency to nyquist rate.

Keywords

analogue-digital conversion; charge compensation; reference circuits; switched capacitor networks; CCB technique; CCU; charge compensation unit; charge-compensation-based technique; enhanced voltage reference; pipelined ADC; proof-of-principle CCB reference design; signal-dependent effect; switched-capacitor ADC; Accuracy; Capacitors; Patents; Pipelines; Simulation; Switches; System-on-chip; ADC; Switched-Capacitor; charge compensation; reference buffer;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems (ISCAS), 2015 IEEE International Symposium on

Conference_Location

Lisbon

Type

conf

DOI

10.1109/ISCAS.2015.7169132

Filename

7169132