Low power band-gap current reference

Details Low power band-gap current reference Low power band-gap current reference

2006-05-02

2006-05-02

Kuntz, Curtis (Department: 2643)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S127100, C455S318000, C455S334000, C323S313000, C323S314000, C327S539000, C327S542000, C327S543000

Reexamination Certificate

active

07039384

ABSTRACT:
A low power supply band-gap current reference includes a 1stP-N junction device, a 2ndand P-N junction device, a 1stcurrent source, a 2ndcurrent source, a 1stresistor, a 2ndresistor, a 3rdresistor, an operational amplifier, and a current mirror. The 1stand 2ndP-N junction devices are operably coupled to the 1stand 2ndcurrent sources, respectively. The 2ndP-N junction device is a larger device than the 1stP-N junction device. The 2ndresistor is operably coupled in parallel with the 1stP-N junction device and the 2ndresistor is coupled in series with the 2ndP-N junction device. The 3rdresistor is coupled in parallel with the series combination of the 2ndresistor and 2ndP-N junction device. The operational amplifier is coupled to control the 1stand 2ndcurrent sources based on the voltage imposed across the 1stand 2ndresistors. The current mirror is operably coupled to mirror the current of the 1stand/or 2ndcurrent source to provide a band-gap reference current.

REFERENCES:
patent: 2002/0070793 (2002-06-01), Ochi
patent: 2003/0006831 (2003-01-01), Coady
patent: 2003/0087617 (2003-05-01), Shohara

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