Title :
A dual-VCO-based quantizer with highly improved linearity and enlarged dynamic range
Author :
Tao He ; Yun Du ; Yang Jiang ; Sai-Weng Sin ; Seng-Pan U ; Martins, Rui P.
Author_Institution :
State-Key Lab. of Analog & Mixed Signal VLSI, Univ. of Macau, Macao, China
Abstract :
In this paper, a novel structure of dual-VCO-based quantizer is introduced to significantly improve the VCO linearity. Compared with the precedent methods, the proposed structure can accomplish the linearity without sacrificing the intrinsic DEM function of the VCO-based quantizer, which greatly simplifies the structure of the circuit implementation. Moreover, a passive adder is introduced in this paper, instead normal active adder; the power consumption can be optimized. Besides, due to the dual-VCO structure, the dynamic range of the modulator can be greatly enlarged. A first order continuous-time (CT) sigma-delta (ΣΔ) modulator with the proposal quantizer is designed and simulated in 65 nm CMOS process. The performance of the modulator can reach 83.7/83 dB SNR/SNDR with 10MHz bandwidth and 1V supply voltage.
Keywords :
CMOS logic circuits; adders; power consumption; quantisation (signal); sigma-delta modulation; voltage-controlled oscillators; CMOS process; DEM function; VCO linearity; dual-VCO-based quantizer; first order continuous-time sigma-delta modulator; normal active adder; passive adder; power consumption; size 65 nm; voltage-controlled oscillator; CMOS integrated circuits; CMOS process; Logic gates; Oscillators; Quantization;
Conference_Titel :
Circuits and Systems (MWSCAS), 2011 IEEE 54th International Midwest Symposium on
Conference_Location :
Seoul
Print_ISBN :
978-1-61284-856-3
Electronic_ISBN :
1548-3746
DOI :
10.1109/MWSCAS.2011.6026520
