Common gate with resistive feed-through low noise amplifier

Details Common gate with resistive feed-through low noise amplifier Common gate with resistive feed-through low noise amplifier

2006-12-05

2009-02-10

Nguyen, Khanh V (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including field effect transistor

C330S310000

Reexamination Certificate

active

07489194

ABSTRACT:
A radio-frequency amplifier is provided. The radio-frequency amplifier includes a transistor having an input terminal, an output terminal, a control terminal, and a transconductance gm. A series-connected feed-through resistance Rfand feed-through capacitance Cfis connected in parallel with the input terminal and the output terminal of the transistor. A load resistance RLis connected to the output terminal. The control terminal of the transistor is biased at a fixed voltage. Part of the transistor noise follows the looped path through the feed-through resistor instead of passing on to the load, which reduces the noise figure of the amplifier. The value of gm, Rfand RLare chosen in a way to keep the input impedance of the amplifier matched to a well-defined signal source impedance.

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