Input matching circuit for multiband low noise amplifier

Details Input matching circuit for multiband low noise amplifier Input matching circuit for multiband low noise amplifier

2007-08-07

2007-08-07

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

C330S311000

Reexamination Certificate

active

11088591

ABSTRACT:
Provided is a multiband low noise amplifier including a first transistor, an input matching circuit, and a first capacitor. The first transistor includes a collector electrically connected to a first power supply, a grounded emitter, and a base connected to the other end of a first inductor having one end as an input end of the low noise amplifier. The input matching circuit is connected between the collector and the base of the first transistor. The first capacitor connected to the collector of the first transistior. The input matching circuit includes a varactor. The input matching circuit includes a second capacitor connected to the varactor. The input matching circuit includes a first resistor connected to the varactor. In the multiband low noise amplifier, a varactor having a variable capacitance is installed at an input end, thereby easily performing band switching through bias voltage control by a small amount and minimizing noises that may be caused by a control signal.

REFERENCES:
patent: 4114105 (1978-09-01), Duncan
patent: 5117203 (1992-05-01), Tennyson
patent: 6586993 (2003-07-01), Macedo
Sharaf et al, “A Compact Approach for the Design of a Dual-Band Low-Noise Amplifier”, pp. 890-893, 2001 IEEE.
Lee et al., “A SiGe Low Noise Amplifier for 2.4/5.2/5.7 GHz WLAN Applications”, 2003 IEEE.

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