Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2002-12-27
2004-08-17
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
C327S427000
Reexamination Certificate
active
06778005
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to current sources, and in particular, current sources capable of providing a high power supply rejection ratio (“PSRR”).
BACKGROUND OF THE INVENTION
PSRR refers to the change in input offset voltage of an operational amplifier (“op-amp”) to the change in the power supply voltage that causes it. The offset voltage refers to the difference in voltage at the two inputs of an op-amp required to bring the output voltage to zero.
SUMMARY OF THE INVENTION
The present invention improves on the topology of a conventional current source by interposing an RC circuit and additional MOS between the output of the buffer and the output of the current source. The topology of the present invention advantageously provides a clean current output by shunting noise to ground.
REFERENCES:
patent: 5373226 (1994-12-01), Kimura
patent: 6255897 (2001-07-01), Klemmer
patent: 6509727 (2003-01-01), Fahrenbruch
Fujiwara Futoshi
Miyanohara Akihiko
Brady W. James
Nguyen Long
Swayze, Jr. W. Daniel
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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