Apparatus and method for providing AC isolation while supplying

Details Apparatus and method for providing AC isolation while supplying Apparatus and method for providing AC isolation while supplying

1993-07-20

1996-02-13

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

34031008, 307125, 363 80, G05F 140, H04M 1104

Patent

active

054914027

ABSTRACT:
A source power coupler for coupling a power source to a first transmission line and a second transmission line. DC power from the power source is conducted by the source power coupler to the first and the second transmission lines while AC signals on the first and the second transmission lines are isolated from the power source by the source power coupler. The source power coupler is comprised of an operational amplifier having a non-inverting input and an inverting input. The gate of a transistor is coupled to an output of the operational amplifier. The transistor's drain is coupled to one of the transmission lines. And the transistor's source is coupled to the inverting input of the op-amp. Thereby, a control loop is formed, which provides an AC impedance between the power source and one of the transmission lines. A resistor is coupled between the source of the transistor and the power source, and a capacitor is coupled between the non-inverting input of the op-amp and the power source. Another resistor is coupled between the non-inverting input of the op-amp one of the transmission lines. The capacitor and the second resistor provide a second control loop. This control loop provides a constant direct current voltage across the transistor.

REFERENCES:
patent: 4211894 (1980-07-01), Watanabe et al.
patent: 4631491 (1986-12-01), Smithers
patent: 4969147 (1990-11-01), Markkula, Jr. et al.
patent: 5212815 (1993-05-01), Schumacher
patent: 5228083 (1993-07-01), Lozowick et al.
patent: 5391932 (1995-02-01), Small et al.

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