Semiconductor output circuit for controlling power supply to...

Details Semiconductor output circuit for controlling power supply to... Semiconductor output circuit for controlling power supply to...

2008-12-10

2010-11-16

Zweizig, Jeffrey S (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

Reexamination Certificate

active

07834669

ABSTRACT:
Between a control terminal (gate) of an output transistor of a source follower configuration and an output terminal to which a load is coupled, a depletion transistor having a relatively lower breakdown voltage (that is, smaller device-area) is provided as a shutdown transistor of the output transistor, to thereby control a conductive state
onconductive state of the depletion transistor. There are provided: the output transistor of the source follower configuration coupled between a first power supply line and the output terminal; the load coupled between the output terminal and a second power supply line; the depletion transistor coupled between the gate of the output transistor and the output terminal; and a control circuit controlling the conductive state
onconductive state of the depletion transistor by applying, between a gate and a source thereof, a voltage smaller than a voltage deference between a potential of the first power supply line and a potential of the second power supply line.

REFERENCES:
patent: 5272399 (1993-12-01), Tihanyi et al.
patent: 5352932 (1994-10-01), Tihanyi
patent: 5910738 (1999-06-01), Shinohe et al.
patent: 5914619 (1999-06-01), Tihanyi
patent: 3-248619 (1991-11-01), None
patent: 6-188710 (1994-07-01), None
patent: 2646786 (1997-05-01), None

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