Bias control circuit for RF switch

Details Bias control circuit for RF switch Bias control circuit for RF switch

1986-06-20

1987-12-08

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307259, 307311, 250551, H03K 1774, H03K 1914

Patent

active

047120207

ABSTRACT:
An RF switch employing a PIN diode as the switching element includes a first bias circuit providing forward dc current through the diode to enable RF transmission therethrough, and a second bias circuit providing reverse dc voltage across the diode to disable RF transmission through the switch. Status circuitry monitors the switch for failure modes of the diode, and control circuitry selectively enables the bias circuits. A short circuit failure of the PIN diode is indicated by the flow of reverse current in the second bias circuit in excess of the diode leakage current. Under this condition, the reverse current is latched by a thyristor in the second bias circuit and the status circuitry generates an alarm signal to the control circuitry inhibiting further selection of the first bias circuit. Optical couplers provide electrical isolation of the first and second bias circuit from the control and status circuitry.

REFERENCES:
patent: 4251742 (1981-02-01), Beelitz
patent: 4369371 (1983-01-01), Hara et al.
patent: 4477817 (1984-10-01), Anderson
patent: 4532433 (1985-07-01), Basile

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