ISDN transmitter

Details ISDN transmitter ISDN transmitter

1992-05-01

1994-10-04

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 28, 341 77, 341143, H04B 1406

Patent

active

053533097

ABSTRACT:
A transmitter suitable for ISDN use feeds the 2B1Q transmit signals directly into a sigma-delta modulator. The input word is two or three bits and the datapath within the sigma-delta modulator need be only six bits wide. The sigma-delta modulator has sample-hold means which has some filtering effect. The additional filtering requirements are met with an analog filter. No digital interpolation filter is required.

REFERENCES:
patent: 4896335 (1990-01-01), Wong et al.
patent: 4901077 (1990-02-01), Christopher
patent: 4995031 (1991-02-01), Aly et al.
patent: 4999830 (1991-03-01), Agazzi et al.
patent: 5144308 (1992-09-01), Norsworthy
patent: 5208594 (1993-05-01), Yamazaki
IEEE, ISSCC, "An ANSI Standard ISDN Transceiver Chip Set," by H. Khorramabadi et al., Feb. 17, 1989, pp. 256, 257, 357.
IEEE, Journal of Solid State Circuits, vol. SC-22, No. 6, Dec. 1987, "A Single-Chip U-Interface Transceiver for ISDN," by D. Sallaerts et al., pp. 1-11-1021.
IEEE, Journal of Solid State Circuits, vol. 24, No. 6, Dec. 1989, "A Single-Chip 2B1Q U-Interface Transceiver," by R. Colbeck et al., pp. 1614-1624.

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