Circuit arrangement and method for sigma-delta conversion...

Details Circuit arrangement and method for sigma-delta conversion... Circuit arrangement and method for sigma-delta conversion...

2006-06-20

2006-06-20

Mai, Lam T. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S155000

Reexamination Certificate

active

07064698

ABSTRACT:
The circuit arrangement has a sigma-delta converter (2) for converting an analog input signal into a digital output signal. The sigma-delta converter (2) contains a loop filter, a comparator connected downstream of the latter and a feedback loop to feed the output signal back to the input signal. To reduce idle tones a dither signal is fed to the comparator by means of a dither-signal line (27.1). The dither signal is not however generated by a complex dither-signal generator. Instead, what is used as a dither signal is a signal that is available in the circuit but is not specifically generated for this purpose, e.g. an output signal from a second sigma-delta converter (2′). The circuit arrangement is thus simpler and less expensive than conventional circuit arrangements without its reduction of idle tones suffering.

REFERENCES:
patent: 6426714 (2002-07-01), Ruha et al.
patent: 6445318 (2002-09-01), Ruha et al.
patent: 6473019 (2002-10-01), Ruha et al.
patent: 6744392 (2004-06-01), Melanson
patent: 6768437 (2004-07-01), Ruotsalainen et al.
patent: 2002/0057214 (2002-05-01), Brooks

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