Amplifiers – With periodic switching input-output
Reexamination Certificate
2007-05-17
2009-08-11
Pascal, Robert (Department: 2817)
Amplifiers
With periodic switching input-output
C327S124000
Reexamination Certificate
active
07573327
ABSTRACT:
An embodiment of the present invention is directed to an instrumentation amplifier. The amplifier includes a first amplification sub-circuit, which includes an input stage for sensing a differential input and generating an intermediate current based thereon, a feedback stage, and an auto-zeroing circuit. The feedback stage is operable to generate a feedback current based on an output voltage of the amplifier. The auto-zeroing circuit is operable to generate a nulling current, which compensates for errors in the intermediate and feedback currents resulting from input offsets in the input and feedback stages. The amplifier further includes a second amplification sub-circuit, an output stage, and a switching circuit. The switching circuit switches the amplifier between first and second configurations. In the first configuration, the first amplification sub-circuit provides a first amplification path for the amplifier. In the second configuration, the second amplification sub-circuit provides a second amplification path for the amplifier.
REFERENCES:
patent: 7132883 (2006-11-01), Huijsing et al.
Pertijs Michiel
Reitsma George
National Semiconductor Corporation
Nguyen Hieu P
Pascal Robert
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