Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2007-06-26
2007-06-26
Zweizig, Jeffrey (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
Reexamination Certificate
active
11260176
ABSTRACT:
A band gap circuit includes a voltage generating circuit, and a first and a second switched capacitor circuits (SCC). Operational amplifier in the first and the second SCC are connected though a coupling capacitor. Capacitance of the coupling capacitor is smaller than that of a feedback capacitor in the first SCC. A PTAT voltage is obtained by multiplying a thermal voltage by a coefficient determined based on capacitances of input capacitors and feedback capacitors in each of the first and the second SCC, and the coupling capacitor. The voltage generating circuit generates a forward bias voltage that has a negative temperature-dependency at a p-n junction. The PTAT voltage is added to the forward bias voltage to generate a reference voltage independent of temperature.
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Mike Tuthill; “A Switched-Current, Switched-Capacitor Temperature Sensor in 0.6-μm CMOS”; IEEE Journal of Solid-State Circuits; vol. 33, No. 7, Jul. 1998.
Kato Tatsuo
Mitsuda Kazuhiro
Tachibana Suguru
Arent & Fox LLP
Fujitsu Limited
Zweizig Jeffrey
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