Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2007-05-08
2007-05-08
Lee, Benny (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S258000, C330S260000
Reexamination Certificate
active
11116427
ABSTRACT:
An amplifier includes differential current sensing circuitry and an input bridge. Two paths of the input bridge receive the input signals and provide proportional current flows to the differential current sensing circuitry. The input bridge is configured to provide a differential offset voltage in one current path, and a complimentary voltage drop of equal magnitude in the other current path. In the examples, the input bridge includes a matched pair of transistors. To remove parallel incremental or small-signal conductance-related error sources, both transistors are operated at matched VDS(drain-to-source) voltages. The voltage offset, provided in association with one of the input transistors, serves to extend the range of certain circuits using the amplifier. The complimentary voltage drop in association with the other input transistor maintains the match of the VDSvoltages for the two transistors.
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Flanagan Krista
Lee Benny
Linear Technology Corporation
McDermott Will & Emery LLP
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