High performance mixed signal circuit

Details High performance mixed signal circuit High performance mixed signal circuit

2008-05-05

2011-10-18

Lugo, David (Department: 2611)

Pulse or digital communications

Transmitters

C327S107000, C327S551000, C708S271000

Reexamination Certificate

active

08040971

ABSTRACT:
The present invention is related to a digital circuit for use in a mixed-signal circuit. The digital circuit comprises:a first circuit for direct digital synthesis comprising a first phase generator (PG1) arranged for being fed with a phase generator input signal, a first phase-to-amplitude converter (PAC1) arranged for being fed with a phase from the first phase generator and for generating a first carrier wave output, and first signal combining means (R1) for combining the first carrier wave output with a first input signal,a noise generator (NG) arranged for generating a pseudo-random noise signal,combining means (S) for combining the pseudo-random noise signal and the phase generator input signal such that the phase generator input signal to the first phase generator (PG1) is randomised,a second circuit for direct digital synthesis comprising a second phase generator (PG2) arranged for being fed with the pseudo-random noise signal, a second phase-to-amplitude converter (PAC2) arranged for being fed with a phase from the second phase generator and for generating a second carrier wave output, and second signal combining means (R2) for combining the second carrier wave output with a second input signal, whereby the second carrier wave output combined with the second input signal is comprised in the first input signal.

REFERENCES:
patent: 5761101 (1998-06-01), Erhage
patent: 6522176 (2003-02-01), Davis
Great Britain search report dated Sep. 18, 2007.

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