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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Lin, N.-S. Fraenkel, B. Jacobs, G. Yiu, L. Senderowicz, D. Ulmer, R. |
| Copyright Year | 1989 |
| Description | Author affiliation: Teknekron Commun. Syst., Berkeley, CA, USA (Lin, N.-S.; Fraenkel, B.; Jacobs, G.; Yiu, L.; Senderowicz, D.) |
| Abstract | A description is given of the key aspects of the design of a single chip sigma-delta analog front end (AFE) for high-speed voiceband modem applications. The AFE includes a transmit channel D/A converter and a receive channel A/D converter, both operating at a sampling rate of 9600 Hz. The circuit is being fabricated using a combination of custom and semicustom cells designed for 1.5- mu m CMOS technology. The A/D modulator has a fully differential switched-capacitor (SC) architecture using a special sampling and integrating mechanism. The design reduces the settling time requirement of the SC circuit without sacrificing the signal-to-quantization-noise ratio (SQNR). Critical impairments of the analog components of the modulator are carefully analyzed, simulated, and traded-off. The decimation and interpolation processes are partitioned in several stages with the intermediate sample rates arranged to achieve the required SQNR at minimum hardware cost. With an oversampling ratio of 128, the simulated peak SQNR is better than 76 dB. Performance is targeted for high-speed data modems such as FAX or V.29, and the design can easily be enhanced to accommodate the more stringent requirements of a V.32 modem.< |
| Starting Page | 2472 |
| Ending Page | 2475 |
| File Size | 413131 |
| Page Count | 4 |
| File Format | |
| ISSN | 15206149 |
| DOI | 10.1109/ICASSP.1989.266968 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1989-05-23 |
| Publisher Place | UK |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Delta-sigma modulation Modems CMOS technology Sampling methods Signal sampling Signal design Analytical models Circuit simulation Interpolation Hardware |
| Content Type | Text |
| Resource Type | Article |
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