Reducing spurious modulation products in broadband multicarrier

Details Reducing spurious modulation products in broadband multicarrier Reducing spurious modulation products in broadband multicarrier

1996-12-20

1999-04-13

Bocure, Tesfaldet

Pulse or digital communications

Transmitters

455 91, H04L 2704

Patent

active

058944974

ABSTRACT:
The Spurious-Free Dynamic Range (SFDR) in a broadband digital radio transceiver is typically limited by the required digital-to-analog converter which introduces differential nonlinearities that cause harmonic distortion in intermodulation products. The invention was a digital-to-analog conversion subsystem that coherently combines the outputs of two or more digital-to-analog converters that have different internal architectures. As a result, spurious responses are not correlated with one another while desired signal components do add coherently. The spurious responses therefore cancel in the combined output while the desired signal components add in phase. The overall result is to increase spurious-free dynamic range at the radio transmitter output.

REFERENCES:
patent: 5537435 (1996-07-01), Carney et al.
patent: 5588022 (1996-12-01), Dapper et al.
patent: 5675572 (1997-10-01), Hidejima et al.
patent: 5748677 (1998-05-01), Kumar

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