Reference voltage generation circuit

Details Reference voltage generation circuit Reference voltage generation circuit

2005-02-14

2009-02-24

Nguyen, Long (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

C327S538000, C327S540000, C323S312000, C323S313000

Reexamination Certificate

active

07495504

ABSTRACT:
In a reference voltage generation circuit, a bandgap reference circuit (BGR circuit)1includes diode element D1and D2having different current densities, three resistive elements R1, R2and R3, a P-type first transistor Tr1for supplying a current to a reference voltage output terminal O, a P-type second transistor Tr2for determining a drain current flowing through the first transistor Tr1by a current mirror structure, and a feedback type control circuit11. The BGR circuit1is connected to a pull-down circuit2. The pull-down circuit2includes a resistive element R4and a P-type transistor Tr4which are connected in series. The resistive element R4is connected to a drain terminal of the second P-type transistor Tr2. The P-type transistor Tr4has a gate terminal connected to the reference voltage output terminal O and a grounded drain terminal. Thus, the number of elements and current consumption in the start-up circuit which shifts the operation from an abnormal stabilization point to a normal stabilization point are reduced.

REFERENCES:
patent: 6018235 (2000-01-01), Mikuni
patent: 6201435 (2001-03-01), Chou
patent: 6891433 (2005-05-01), Schrader
patent: 2003/0080806 (2003-05-01), Naoki
patent: 2000-181554 (2000-06-01), None
patent: 3185698 (2001-05-01), None
patent: 2003-131749 (2003-05-01), None
Design and Analysis of Integrator-Based Log-Domain Filter Circuits by Gordon W. Roberts, Vincent W. Leung http://books.google.com/books?id=g4A4yTP-TZ4C&pg=PA2&lpg=PA2&dq=transistor+acting+as+resistor&source=web&ots=rM3nE3NmCA&sig=hkD0mF3pX8NWFsBtQbw1ptGL0fQ#PPA3,M1.
Diode Resistance http://www.geocities.com/tube—theory/Diode.htm?200828.

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