Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2006-03-21
2006-03-21
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
C327S143000, C327S408000
Reexamination Certificate
active
07015746
ABSTRACT:
A biasing circuit is arranged to provide relatively well controlled startup and steady state behavior for a reference circuit such as noise immunity and reduced dependence on supplies. The biasing circuit initially employs an independent bias current for biasing the reference circuit at startup until a large enough bootstrapped (output voltage referenced) bias current can be generated that can take over the subsequent biasing of the circuit in the steady state. In one embodiment, a Power On Reset (POR) signal can be generated during the transition from an initial biasing of the reference circuit by the independent bias current to a subsequent steady state biasing provided by the bootstrapped bias current. Also, the assertion of the POR signal can be employed to turn off the transistors providing the independent bias current.
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Martinez Steve A.
Megaw David J.
Ranucci Paul D.
Branch John W.
Darby & Darby PC
National Semiconductor Corporation
Zweizig Jeffrey
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