Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2007-04-03
2007-04-03
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C323S314000, C323S315000
Reexamination Certificate
active
10940184
ABSTRACT:
A bandgap circuit comprising a current generation circuit and a current replication circuit is provided herein. The output current of the current generation circuit is generated as a weighted sum of two currents. The circuit configuration of the current generation circuit allows it to function at low power supply voltages, e.g., on the order of 1 V. The current replication circuit includes an operational amplifier, which when configured in conjunction with MOS cascode current sources and the current generation circuit, significantly increases the accuracy and insensitivity to power supply noise of the bandgap circuit output current. A resistor may be included between the bandgap circuit output node and ground for generating a reference voltage with increased accuracy and insensitivity to power supply noise.
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Meyers Steven
Zupcau Dan Laurentiu
Callahan Timothy P.
Cypress Semiconductor Corp.
Daffer Kevin L.
Daffer McDaniel LLP
Englund Terry L.
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