Variable rate sigma delta modulator

Details Variable rate sigma delta modulator Variable rate sigma delta modulator

2005-09-13

2005-09-13

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S200000

Reexamination Certificate

active

06943716

ABSTRACT:
A sigma delta circuit is provided having a sigma delta modulator configured to operate according to a first clock signal and a quantizer connected to the sigma delta modulator, where the quantizer is configured to operate according to a second clock signal. In operation, if a small amplitude signal is received by the sigma delta circuit, the circuit is configured to operate at a fixed output frequency. When a large amplitude signal is received, the circuit is configured to adjust to a different frequency to accommodate the larger signal. The second clock signal may be a variable clock signal, where the quantizer operates according to a variable clock signal in order to adjust to different input signals.

REFERENCES:
patent: 5303346 (1994-04-01), Fesseler et al.
patent: 5347310 (1994-09-01), Yamada et al.
patent: 5963160 (1999-10-01), Wilson et al.
patent: 6661362 (2003-12-01), Brooks
patent: 6664908 (2003-12-01), Sundquist et al.

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