Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2006-07-04
2006-07-04
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
07071767
ABSTRACT:
A voltage/current reference circuit includes a first bipolar transistor and a second bipolar transistor that exhibit a first voltage drop VBE1and a second voltage drop VBE2, respectively. A first resistor, having a resistance R1, is configured to draw a first current equal to (VBE1−VBE2)/R1. A second resistor, having a resistance R2, is configured to draw a second current equal to VBE1/R2. A first transistor supplies the first and second currents to the first and second resistors. A second transistor, having a current mirror configuration with respect to the first transistor, directly provides a reference current equal to (VBE1−VBE2)/R1+VBE1/R2. A third transistor, having a current mirror configuration with respect to the first transistor, provides a current equal to the reference current to a third resistor having a resistance R3and a third bipolar transistor that exhibits a third voltage drop VBE3, thereby generating a reference voltage.
REFERENCES:
patent: 6452437 (2002-09-01), Takeuchi et al.
patent: 6489835 (2002-12-01), Yu et al.
patent: 6690228 (2004-02-01), Chen et al.
patent: 6724176 (2004-04-01), Wong et al.
patent: 6885178 (2005-04-01), Marinca
Gu YuFei
Ou-yang Qing
Yang Howard
Bever Hoffman & Harms
Integrated Device Technology Inc.
Zweizig Jeffrey
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