Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2006-11-28
2006-11-28
Nguyen, Linh My (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S540000
Reexamination Certificate
active
07142042
ABSTRACT:
A multi-stage amplifier circuit that is arranged to minimize offset related errors in a reference circuit. The first stage circuit includes an array of amplifier circuits that receive feedback signals. The outputs of the first stage amplifier circuits are coupled together to a common node. The second stage circuit is also coupled to the common node, and arranged to drive a feedback circuit to generate the feedback signals. In one example, the feedback circuit includes a band-gap core. The second stage circuit can be arranged as part of a low-drop out (LDO) regulator. Each of the amplifier circuits in the first stage can be nulled in response to null control signals from a null control logic circuit. The overall offset in the resulting reference circuit is reduced by the selective nulling of the arrayed amplifiers in the first stage circuit.
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Hertzberg Brett A.
Merchant & Gould P,C,
National Semiconductor Corporation
Nguyen Linh My
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