H - Electricity – 04 – M
Patent
H - Electricity
04
M
H04M 1/738 (2006.01) H04L 27/00 (2006.01) H04M 11/06 (2006.01)
Patent
CA 2329109
A directional coupler for a modem has a high common mode noise rejection characteristic with low transmit signal leakage, and reduced distortion of components mixed with a received signal. A primary filter network is connected to a communications circuit. The primary filter network has an output connected to an input of an amplifier. A feedback network is connected between the input and output of the amplifier. The primary filter network, the amplifier and the feedback network are arranged to provide a virtual ground at the input of the amplifier, and a filter characteristic which attenuates frequencies in the transmit signal band. The advantage is reduced component count while providing excellent transmit signal rejection and reducing received signal distortion.
Gorcea Dan V.
Thomas Robert M.
Nortel Networks Limited
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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