Tunable digital modulator integrated circuit using multiplexed D

Details Tunable digital modulator integrated circuit using multiplexed D Tunable digital modulator integrated circuit using multiplexed D

1997-02-11

1998-09-29

Grimm, Siegfried H.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

375261, 375279, 375298, 375308, 341118, 341144, H04L 2720, H04L 2736, H03M 108

Patent

active

058150463

ABSTRACT:
A tunable digital modulator is tunable across an R.F. frequency range for transmission without additional frequency conversion and includes two toggled multiplexed analog-to-digital converters for reducing spurious frequency components in the output. The modulator and digital-to-analog converters are fabricated in a single integrated circuit with the two converters laid out physically in adjacent spaces with their gain and voltage characteristics matched. By alternating the two digital-to-analog converters in producing the analog modulated signal output, transients from switching of the converters have a chance to die out before the output of each converter is sampled. Thus, any spurious glitch energy is greatly attenuated.

REFERENCES:
patent: 3877023 (1975-04-01), Spicer et al.
patent: 5293407 (1994-03-01), Shibata
patent: 5412352 (1995-05-01), Graham
Kushner et al., "Spurious Reduction for Direct Digital Synthesizers," Applied Microwave & Wireless, Summer 1996, pp. 44, 46, 48, 50, 52, 55, 56, 58, 60, 63.
Samueli et al., "VLSI Architectures for a High-Speed Tunable Digital Modulator/Demodulator/Bandpass-Filter Chip Set," 1992 IEEE International Symposium on Circuits and Systems, vol. 3 of 6, May 10-13, 1992, pp. 1065-1068.

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