Hybrid circuit including capacitive charge-transfer means

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

1981-11-20

1983-11-15

Rubinson, G. Z.

179170T, H04B 158

Patent

active

044157770

ABSTRACT:
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.

REFERENCES:
patent: 4251785 (1981-02-01), Pfleiderer

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