Pulse or digital communications – Equalizers
Reexamination Certificate
2005-04-05
2005-04-05
Chin, Stephen (Department: 2634)
Pulse or digital communications
Equalizers
C375S222000, C341S143000, C379S387010
Reexamination Certificate
active
06876698
ABSTRACT:
A tunable narrow-band filter that includes a sigma-delta modulator. In one embodiment, a conventional DC canceler is modified to include a re-quantizer in the feedback loop in the form of a ΣΔ modulator. In another embodiment, a digital receiver employs a processing chip, such as an FPGA, that includes a ΣΔ modulator to requantize oversampled control signals in the digital receiver. In still another embodiment, a wide-bandwidth sigma-delta loop has a tunable center frequency.
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Dick Christopher H.
Harris Frederic J.
Behiel Arthur J.
Chin Stephen
Hoffman Bernard S.
Liu Justin
Pathak Sudhanshu C.
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