Signal amplifier device
AssigneeSony Semiconductor Solutions Corporation
InventorYoshikatsu Jingu
Life of this patent
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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.
Claims9
A signal amplifier device, comprising:
- a main path first amplifier circuit configured to amplify an input signal on a main path;
- a main path second amplifier circuit that includes:
- a first common-gate transistor connected in series to an output of the main path first amplifier circuit without a direct current being shared between the main path first amplifier circuit and the main path second amplifier circuit;
- a first bias element configured to supply a first direct current to a source of the first common-gate transistor, wherein the first bias element is a constant current source;
- and
- a second bias element configured to supply a second direct current to a drain of the first common-gate transistor;
- and
- a sub path amplifier circuit configured to amplify, on a sub path connected in parallel to the main path, the input signal based on a gain lower than a maximum gain on the main path.
Dependencies are inferred from the claim text.