Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Patent
1995-05-17
1997-04-01
Krishnan, Aditya
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
G05F 320
Patent
active
056170173
ABSTRACT:
An improved output driver is disclosed having a pull-off diode-connected transistor and a resistor for keeping a pass transistor off when no load current is desired. An MOS transistor is coupled in parallel with the pull-off diode. As the input voltage increases beyond a threshold level, the diode is no longer able to pull-off the pass transistor's base due to increasing leakage currents in the pass transistor and is thus unable to turn off the pass transistor. The MOS transistor turns on at this threshold voltage and pulls-off the pass transistor's base hard enough to keep the pass transistor off. In one embodiment, the MOS transistor is incorporated into an unadjusted field region of the diode-connected transistor without any additional masking or processing steps. Further, since it is formed in the field region of the diode, the inclusion of the MOS transistor requires no additional surface area.
REFERENCES:
patent: 4868703 (1989-09-01), Bozkowicz
patent: 5148099 (1992-09-01), Ong
patent: 5149988 (1992-09-01), Smith et al.
patent: 5373228 (1994-12-01), Holle
Krishnan Aditya
Micrel Incorporated
Paradice III William L.
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