Digital-to-analog signal converting apparatus and method to...

Details Digital-to-analog signal converting apparatus and method to... Digital-to-analog signal converting apparatus and method to...

2006-04-04

2006-04-04

Wamsley, Patrick (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Multiplex

C327S105000, C708S271000

Reexamination Certificate

active

07023368

ABSTRACT:
A digital-circuit return-to-zero device and method for digital-to-analog conversion is disclosed that uses an internal multiplexer alternatively selecting, or selecting in a scheduled fashion, digital input data and an expansion code. By the using the disclosed multiplexing process, where the expansion code is a null code, the usable analog spectrum of the digital-to-analog converter (DAC) extends beyond that of DACs. With the multiplexing process applied to a complementary interpolation process, the disclosed device is adapted for selective enhancement of the frequency spectrum proximate to the clock frequency. While extending the usable frequency spectrum beyond conventional DACs, the present invention, in its several embodiments, features low complexity and high portability relative to known response expansion solutions.

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