Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2006-07-18
2009-02-24
Ullah, Akm E (Department: 2838)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S538000, C327S513000, C327S540000, C327S541000, C327S512000, C323S313000, C323S315000, C323S316000
Reexamination Certificate
active
07495505
ABSTRACT:
A low supply voltage band-gap reference circuit is provided, which includes a positive temperature coefficient current generation unit and a negative temperature coefficient current generation unit, and it is implemented by way of current summing. Through the current-mode temperature compensation technique, the present invention is able to reduce the voltage headroom and the number of operational amplifiers required by the conventional voltage-summing method, as well as the influence to the output voltage due to the offset voltage, thereby providing a stable and low voltage band-gap reference voltage level. In addition, by reducing the number of operational amplifiers and resistors of high resistance, the circuit area is reduced, and chip cost is saved.
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Chang Kuen-Shan
Chen Mei-Show
Hong Chia-Ming
Uang Uei-Shan
Faraday Technology Corp.
J.C. Patents
Ullah Akm E
Zhang Jue
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