Broadband amplifier with improved noise figure and distortion characteristics
AssigneeAlps Electric Co., Ltd.
InventorMasaki Yamamoto
Life of this patent
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Abstract
A broadcast transistor includes an amplifier transistor, and a negative feedback circuit connected to the amplifier transistor. A collector bias current in the amplifier transistor is switched to high and low within a range larger than a range of a current exhibiting the minimum noise figure, and the amount of feedback performed by the negative feedback circuit is changed in association with the switching of the collector bias current. When the collector bias current is switched to high, the amount of feedback becomes large; when the collector bias current is switched to low, the amount of feedback becomes small.
Claims13
A broadband amplifier comprising:
- an amplifier transistor;
- and
- a negative feedback circuit connected to the amplifier transistor,
- wherein a collector bias current value in the amplifier transistor is switched to a high current value and a low current value within a range of a current value larger than a value of a current exhibiting a minimum noise figure, and an amount of feedback performed by the negative feedback circuit is changed in association with the switching of the collector bias current, the amount of feedback being large when the collector bias current is switched to high, the amount of feedback being small when the collector bias current is switched to low.
Dependencies are inferred from the claim text.