Name
Title | ||
|---|---|---|
A Cascaded Continuous-Time Sigma Delta Modulator With 67-Db Dynamic Range In 10-Mhz Bandwidth |
Abstract | ||
|---|---|---|
This paper presents the design of a 2-2 cascaded continuous-time sigma-delta modulator. The cascaded modulator comprises two stages with second-order continuous-time resonator loopfilters, 4-bit quantizers, and feedback digital-to-analog converters. The digital noise cancellation filter design is determined using continuous-time to discrete-time transformation of the sigma-delta loopfilter transfer functions. The required matching between the analog and digital filter coefficients is achieved by means of simple digital calibration of the noise cancellation filter. Measurement results of a 0.18-mum CMOS prototype chip demonstrate 67-dB dynamic range in a 10-MHz bandwidth at 8 times oversampling for a single, continuous-time cascaded modulator. Two cascaded modulators in quadrature configuration provide 20-MHz aggregate bandwidth. Measured anti-alias suppression is over 50 dB for input signals in the band from 150 to 170 MHz around the sampling frequency of 160 MHz. |
Year | DOI | Venue |
|---|---|---|
2004 | 10.1109/JSSC.2004.836245 | IEEE JOURNAL OF SOLID-STATE CIRCUITS |
Keywords | DocType | Volume |
analog-to-digital conversion, cascaded sigmadelta modulation, continuous-time sigma-delta modulation, digital calibration, MASH | Journal | 39 |
Issue | ISSN | Citations |
12 | 0018-9200 | 17 |
PageRank | References | Authors |
3.40 | 0 | 3 |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Lucien J. Breems | 1 | 99 | 20.57 |
| Robert Rutten | 2 | 42 | 12.13 |
| Gunnar Wetzker | 3 | 17 | 3.74 |