Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2008-03-14
2010-06-15
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
C327S539000, C327S543000
Reexamination Certificate
active
07737769
ABSTRACT:
A circuit includes an OPAMP-less bandgap voltage generating core circuit connected between a regulated voltage and a ground reference to generate an output bandgap voltage. A preregulator circuit generates the regulated voltage from an unregulated supply voltage. The preregulator circuit includes a negative feedback loop operable to stabilize the regulated voltage and a current source operable to source current for the regulated voltage, the current source mirroring a PTAT current of the OPAMP-less bandgap voltage generating core circuit. The core circuit further includes a negative feedback loop and a positive feedback loop, the negative and positive feedback loops functioning to equalize two internal voltages within the core.
REFERENCES:
patent: 6222399 (2001-04-01), Imbornone et al.
patent: 6294902 (2001-09-01), Moreland et al.
patent: 6815941 (2004-11-01), Butler
patent: 7193402 (2007-03-01), Lee et al.
patent: 7408335 (2008-08-01), Wong et al.
patent: 2009/0231770 (2009-09-01), Schuelke et al.
Deng Yun Fei
Tang Shun Bai
Chen Sibin
Jorgenson Lisa K.
Nguyen Long
Shenzhen STS Microelectronics Co. Ltd.
Szuwalski Andre M.
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