Title :
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
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;
Conference_Titel :
Circuits and Systems (ISCAS), 2015 IEEE International Symposium on
Conference_Location :
Lisbon
DOI :
10.1109/ISCAS.2015.7169132
