Signal amplifier device
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United States of America Patent
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May 25, 2021
Grant Date -
Jun 27, 2019
app pub date -
Jun 20, 2017
filing date -
Aug 23, 2016
priority date (Note) -
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Abstract
A signal amplifier device is provided to ensure the continuity of the gain of an amplifier. The signal amplifier device includes a main path and a sub path connected in parallel to the main path. A main path first amplifier circuit amplifies an input signal on the main path. A main path second amplifier circuit includes a common-gate transistor connected in series with an output of the main path first amplifier circuit without sharing a DC current. On the main sub path, the sub path amplifier circuit amplifies the input signal by using a gain lower than the maximum gain in the main path.
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