Hybrid circuit including capacitive charge-transfer means

Details Hybrid circuit including capacitive charge-transfer means Hybrid circuit including capacitive charge-transfer means

H - Electricity

04

B

379/69, 340/98

H04B 3/36 (2006.01) H04B 1/58 (2006.01)

Patent

CA 1157124

HYBRID CIRCUIT INCLUDING CAPACITIVE CHARGE-TRANSFER MEANS Abstract of the Disclosure A hybrid circuit includes a capacitive charge-transfer arrangement, comprising parallel capacitors and series switches, for coupling signals in one or both directions between a four-wire line and a two-wire line. The switches are constituted by VMOS power FETs. In one embodiment, the charge-transfer arrangement is provided in the receive Path to give the desired properties of electrical isolation and unbalanced to balanced conversion of receive path signals. Signals from the two-wire line are coupled to a transmit path of the four-wire line via an attenuating and high-pass filtering arrangement and a differential amplifier, thereby providing good common mode rejection of high voltage signals, especially at power line frequencies. In another embodiment, the charge-transfer arrangement is provided, commonly for the receive and transmit paths, for coupling the two-wire line to the remainder of the hybrid circuit. - i -

390377

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