Low noise amplifier

Amplifiers – With semiconductor amplifying device – Including balanced to unbalanced circuits and vice versa

Reexamination Certificate

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C330S079000, C330S292000

Reexamination Certificate

active

07843272

ABSTRACT:
A low noise amplifier having a wide operating frequency band and a high dynamic range is provided. A transformer having a secondary winding connected between an input terminal to which an input signal is applied and a positive differential output terminal, and a primary winding connected between a negative differential output terminal and an input node is provided as a feedback circuit between a cascode amplifier circuit, which includes transistors and a resistor, and an output circuit, which includes a transistor and a constant current source. Selective use of a transformer whose leakage inductance has an adequate value as the feedback transformer can realize a low noise amplifier which has a wide operating frequency band and a high dynamic range.

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