Automatic adjustment circuit for amplitude of differential...

Details Automatic adjustment circuit for amplitude of differential... Automatic adjustment circuit for amplitude of differential...

2007-08-31

2010-11-09

Anderson, Matthew D (Department: 2618)

Telecommunications

Transmitter

Measuring, testing, or monitoring of transmitter

C455S126000

Reexamination Certificate

active

07831223

ABSTRACT:
An automatic adjustment circuit for amplitude of differential signal has a differential signal transceiver that transmits differential signals, an amplitude setting register in which plural setting values for setting amplitude of the differential signals are stored, an amplitude control circuit that controls the amplitude of the differential signals, a pattern generating circuit that outputs a test pattern, a multiplexer, a squelch detection receiver, a test loop-back circuit, a squelch-signal-change-detection expected-value memory that stores an expected value of a change in a squelch signal, a squelch-signal-change detection counter that counts the change in the squelch signal, a comparator that compares the expected value and a count value and outputs a difference value of the values, a comparison result memory that stores the difference value, and a controller.

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patent: 6653870 (2003-11-01), Nakada
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patent: 2005/0135489 (2005-06-01), Ho et al.
patent: 2005/0193275 (2005-09-01), Gohel
patent: 2002-344541 (2002-11-01), None

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