Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1994-12-14
1996-09-10
Cunningham, Terry
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327427, 327430, 327431, 327432, G05F 302
Patent
active
055549543
ABSTRACT:
A power supply circuit disclosed herein includes a three-terminal regulator for stabilizing a positive voltage applied thereto, a voltage converter for converting the stabilized voltage into a negative voltage, a power-supply section for stabilizing a voltage by a light-emitting diode, and a control circuit for applying a bias voltage across a drain and source of a GaAs FET amplifier only when a voltage is being applied across the gate and source of the amplifier. When power is introduced from a power supply, the presence of the negative voltage supplied from the voltage converter is sensed by the control circuit and a bias begins to be applied to the gate. Therefore, when it is sensed that a predetermined voltage is applied to the gate, a bias begins to be applied to the drain of the FET thereafter. When power from the power supply is cut off, a drop in voltage is sensed and the drain bias begins being cut off while the gate bias for the FET is cut off thereafter.
REFERENCES:
patent: 3140408 (1964-07-01), May
patent: 3742830 (1973-07-01), Matsuzaki et al.
patent: 4605866 (1986-08-01), Conn
patent: 5134323 (1992-07-01), Congdon
patent: 5361007 (1994-11-01), Ohta
patent: 5371415 (1994-12-01), Dixon et al.
patent: 5396132 (1995-03-01), Shiga
patent: 5442562 (1995-06-01), Mammano et al.
Cunningham Terry
NEC Corporation
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