Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2005-05-31
2005-05-31
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S543000, C323S316000
Reexamination Certificate
active
06900689
ABSTRACT:
A CMOS reference voltage circuit, preferably formed on a semiconductor integrated circuit, and outputting a reference voltage having a temperature-independent characteristic, comprises first and second diode-connected transistors (or diodes), respectively grounded and driven with two constant currents bearing a constant current ratio to each other, and a unit for amplifying a differential voltage of output voltages from the first and second transistors by a preset factor and for summing the amplified differential voltage to an output voltage of the first or second transistor. The amplifying and summing unit is formed by two OTAs11, 12and a current mirror circuit13. The first OTA11is fed with the differential voltage and the second OTA12has a reverse phase input terminal fed with an output voltage from the first or second transistor and a forward phase input terminal connected to its output terminal and driven with a current proportional to an output current of the first OTA11, with an output terminal voltage of the second OTA12being used as an output voltage.
REFERENCES:
patent: 4857823 (1989-08-01), Bitting
patent: 5867054 (1999-02-01), Kotowski
patent: 6091287 (2000-07-01), Salter et al.
patent: 6150872 (2000-11-01), McNeill et al.
patent: A 8-314561 (1996-11-01), None
Callahan Timothy P.
Englund Terry L.
Hayes & Soloway P.C.
NEC Electronics Corporation
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