Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2007-05-31
2009-08-11
Donovan, Lincoln (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S540000, C327S541000, C327S543000
Reexamination Certificate
active
07573323
ABSTRACT:
A reference current is generated by a current mirror circuit. An operational amplifier of a feedback circuit generates a control voltage for control of the feedback circuit transistor. The size of the feedback circuit transistor is trimmed, and the current through the feedback circuit transistor remains relatively constant via operation of the feedback circuit. The feedback circuit transistor is scaled in size relative to the size of current reference transistor(s) (e.g., current sources or sinks), which are tied to the same control voltage. The reference current of the current reference transistors thus varies with the size of the feedback circuit transistor. Further advantageously, transistors providing reference currents for resistor ladders can also be tied to the same control voltage, but scaled proportionally with changes in size to the feedback circuit transistor, thereby maintaining relatively constant voltage from taps of the resistor ladder, even when the feedback circuit transistor is trimmed.
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Martinussen Tore
Moholt Jørgen
Pahr Per Olaf
Aptina Imaging Corporation
Donovan Lincoln
Houston Adam D
Kramer Levin Naftalis & Frankel LLP
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