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

fYear

2011

fDate

7-10 Aug. 2011

Firstpage

1

Lastpage

4

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems (MWSCAS), 2011 IEEE 54th International Midwest Symposium on

Conference_Location

Seoul

ISSN

1548-3746

Print_ISBN

978-1-61284-856-3

Electronic_ISBN

1548-3746

Type

conf

DOI

10.1109/MWSCAS.2011.6026520

Filename

6026520