A 75.1dB SNDR, 80.2dB DR, 4th-order feed-forward continuous-time sigma-delta modulator with hybrid integrator for silicon TV-tuner application

Author

Ho, Chen-Yen ; Lee, Zwei-Mei ; Huang, Mu-Chen ; Huang, Sheng-Jui

Author_Institution

MediaTek Inc., Hsin-Chu, Taiwan

fYear

2011

fDate

14-16 Nov. 2011

Firstpage

261

Lastpage

264

Abstract

A 4th-order resistive feed-forward continuous time sigma-delta modulator (CTSDM) for a worldwide analog/digital TV-receiver is presented. The proposed hybrid integrator of the modulator is developed in order to save the summing amplifier and reduce total area. In addition, the modulator incorporates the proposed low power operational amplifiers (op-amp) with active feed-forward compensation to reduce power consumption in the loop filter. The prototype chip is implemented in a 55nm CMOS process which occupies 0.132 mm². Measurements show that the proposed modulator achieves 80.2dB dynamic range, 75.1dB SNDR, and an effective number of bits (ENOB) of 12.2 bits over 5 MHz signal bandwidth. The figure of merit (FOM) is 0.28 pJ/conversion at 1.3 V supply.

Keywords

CMOS integrated circuits; compensation; elemental semiconductors; feedforward; operational amplifiers; sigma-delta modulation; silicon; television receivers; 4th-order feedforward continuous-time sigma-delta modulator; CMOS process; Si; active feedforward compensation; analog-digital TV-receiver; bandwidth 5 MHz; figure of merit; hybrid integrator; loop filter; low power operational amplifiers; modulator; power consumption; silicon TV-tuner; size 55 nm; summing amplifier; voltage 1.3 V; Bandwidth; Calibration; Capacitors; Modulation; Resistors; Signal to noise ratio; Topology;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid State Circuits Conference (A-SSCC), 2011 IEEE Asian

Conference_Location

Jeju

Print_ISBN

978-1-4577-1784-0

Type

conf

DOI

10.1109/ASSCC.2011.6123560

Filename

6123560