Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2006-10-31
2006-10-31
Patel, Rajnikant B. (Department: 2838)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S561000, C323S313000, C323S277000
Reexamination Certificate
active
07129773
ABSTRACT:
A band-gap type constant voltage generating circuit is produced in a semiconductor chip, and has a first potential terminal and a second potential terminal. A band-gap circuit includes first and second transistors having respective bases connected to each other, a first resistor connected between emitters of the first and second transistors, and a second resistor connected between the emitter of the second transistor and the first potential terminal. A constant voltage production circuit is provided between the first and second potential terminals to produce and output a constant voltage based on a base-emitter voltage of the second transistor of the band-gap circuit, and the constant voltage is fed as a feedback signal to the base of the second transistor of the band-gap circuit. A driver circuit is provided between the first and second potential terminals and connected to collectors of the first and second transistors to drive the band-gap circuit. The driver circuit is constituted such that an influence of absolute process fluctuation, to which the semiconductor chip is subjected during a production process thereof, is eliminated from the constant voltage.
REFERENCES:
patent: 5428687 (1995-06-01), Willcocks et al.
patent: 6815998 (2004-11-01), Samad
Ito Masahiro
Tatewaki Masafumi
McGinn IP Law Group PLLC
NEC Electronics Corporation
Patel Rajnikant B.
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