H - Electricity – 03 – H
Patent
H - Electricity
03
H
H03H 11/04 (2006.01) H03H 11/12 (2006.01) H03H 17/02 (2006.01)
Patent
CA 2226610
A circuit for training a trainable filter circuit having an adjustable time constant, the circuit having a clock generator operative to generate first and second clock signals on first and second clock signal outputs, respectively, of substantially the same amplitude and frequency. A first circuit has a reference filter circuit coupled to the first clock signal output and the second clock signal has the trainable filter circuit coupled to the second clock signal output. Means for adjusting one of the voltage input to and time constant of the reference circuit are provided. An amplifier coupled to an output of the reference circuit and to an output of the trainable filter circuit is operative to produce a DC output when the amplitudes of signals on the reference circuit output and the training circuit output are equal and an AC signal when they are unequal. A separator circuit coupled to an output of said amplifier is operative to rectify the AC signal and to subtract therefrom the DC signal and a feedback line couples an output of the separator circuit to the trainable filter circuit whereby an RC time constant of the trainable loop is modified until said AC signal is zero.
Nexus Law Group Llp
Pmc-Sierra Inc.
Pmc-Sierra Ltd.
LandOfFree
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