Title:
NOISE SHAPING CIRCUITS AND METHODS WITH FEEDBACK STEERING OVERLOAD COMPENSATION AND SYSTEMS USING THE SAME
Document Type and Number:
WIPO Patent Application WO2004032333
Kind Code:
A8
Abstract:
A noise shaper includes a first feedback loop for noise shaping a first feedback signal under normal operating conditions and having a first filter (201) with a first signal transfer function and a second feedback loop that is stable under overload conditions and has a second filter (202) having a second signal transfer function differing from the first signal transfer function. The noise shaper also includes an output circuit block including a quantizer (203) and steering circuitry (204). The quantizer (203) includes an input simultaneously responsive to outputs of the first (201) and second filters (202). The steering circuitry (204) steers a feedback from an output of the quantizer (203) to input of the first and second feedback loops. The steering circuitry (204) steers feedback from output of the quantizer (203) to inputs of the first and second feedback loops, the steering circuitry (204) including a first output for providing the first feedback signal to the first feedback loop and a second output for providing a second feedback signal to the second feedback loop.
Inventors:
MELANSON JOHN LAURENCE
Application Number:
PCT/US2003/024243
Publication Date:
October 14, 2004
Filing Date:
August 01, 2003
Export Citation:
Assignee:
CIRRUS LOGIC INC (US)
International Classes:
H03M7/32; H03M3/04; H03M7/36; (IPC1-7): H03M3/00
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