Multistage bandpass delta sigma modulators

Author

Ribner, David B.

Author_Institution

Analog Devices Inc., Wilmington, MA, USA

Volume

41

Issue

6

fYear

1994

fDate

6/1/1994 12:00:00 AM

Firstpage

402

Lastpage

405

Abstract

A new architecture for oversampled delta sigma A/D conversion of high-frequency narrow band signals using cascaded low-order stages to obtain high overall order of noise shaping is described. The architecture involves using resonators in individual stages to suppress quantization noise at the resonant frequency. Many of the problems of previous single stage high-order architectures including poor stability, large component spread and design complexity are overcome by this new approach. Switched capacitor resonator circuit implementations and simulation results for a sixth-order modulator example are included. Estimates of the potential for 16-bit A/D conversion of 2.5 MHz signals exceed the 80 KHz capability of existing monolithic oversampled CMOS A/Ds

Keywords

CMOS integrated circuits; analogue-digital conversion; cascade networks; delta modulation; modulators; resonators; switched capacitor networks; 16-bit A/D conversion; 2.5 MHz; cascaded low-order stages; design complexity; high-frequency narrow band signals; large component spread; multistage bandpass delta sigma modulators; noise shaping; oversampled delta sigma A/D conversion; poor stability; quantization noise; resonant frequency; single stage high-order architectures; sixth-order modulator; switched capacitor resonator circuit implementations; Circuit noise; Circuit stability; Delta-sigma modulation; Multi-stage noise shaping; Narrowband; Noise shaping; Quantization; Resonant frequency; Switched capacitor circuits; Switching circuits;

fLanguage

English

Journal_Title

Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1057-7130

Type

jour

DOI

10.1109/82.300199

Filename

300199