Single pole double throw switch

Details Single pole double throw switch Single pole double throw switch

1998-03-05

1999-11-23

Elms, Richard T.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307116, 307130, 327427, H01H 4700

Patent

active

059905808

ABSTRACT:
An electronic SPDT switch (1) has, a series FET (9) in a first circuit arm (4) between a common port (2) and a first port (3), a shunt FET (10) in a second circuit arm (6) between the common port (2) and a second port (5), the shunt FET (10) being isolated 90 degrees or 1/4 wavelength from the common port (2), a source applying pull-up voltage to sources of respective FETs (9, 10) and to the common port (2), to provide a connection of the common port (2) with said second port (5), a source applying a first control voltage of opposite logic state to said gates, and the FETs (9, 10) being depletion mode FETs that conduct at a zero sum of said bias voltage and said control voltage, and that conduct when DC power is interrupted, to provide a connection of the common port (2) with the first port (3).

REFERENCES:
patent: 5274343 (1993-12-01), Russell et al.
patent: 5350957 (1994-09-01), Cooper et al.
patent: 5731607 (1998-03-01), Kohama
patent: 5812939 (1998-09-01), Kohama
patent: 5825227 (1998-10-01), Kohama et al.

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