Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2006-05-30
2006-05-30
Tra, Quan (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S560000
Reexamination Certificate
active
07053695
ABSTRACT:
There is provided a current source circuit in which a outflow current of an output terminal is equal to an inflow current thereof. The current source circuit includes a first transistor group converting a reference current from a reference current source into a voltage and a first transistor having a current mirror relationship with the first transistor group, and allowing an output current to flow therethrough. An error amplifier compares a voltage generated in the first transistor group and supplied to one input terminal with a voltage supplied to the other input terminal. A second transistor is driven with an output voltage of the error amplifier. A third transistor is driven with the output voltage of the error amplifier, and allows an output current to flow therethrough in a direction opposite to the output current of the first transistor with respect to an output terminal. A second transistor group converts a current flowing through the second transistor into a voltage to supply the voltage to the other input terminal of the error amplifier.
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“CMOS Analog Circuit Design Second Edition”, p. 196, published by OXFORD, Phillip E. Allen and Douglas R. Holberg.
Ozasa Masayuki
Shimaoka Hiroyasu
Hamre Schumann Mueller & Larson P.C.
Matsushita Electric - Industrial Co., Ltd.
Tra Quan
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