Continuous variable-gain low-noise amplifier

Details Continuous variable-gain low-noise amplifier Continuous variable-gain low-noise amplifier

2007-01-16

2007-01-16

Nguyen, Khanh Van (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S100000, C330S278000, C330S311000

Reexamination Certificate

active

10928713

ABSTRACT:
Continuous variable-gain low-noise amplifier. The amplifier continuously adjusts its gain between well-defined high and low values by using a cascode current-steering circuit to partition signal current between two different nodes of an output loading network. A shunt feedback network connected from an intermediate node of the loading network to the input provides negative feedback that linearizes the amplifier as its gain is decreased. The circuit degrades the noise figure at lower gains by varying the gain without directly dumping the signal current to the power supply. The circuit produces only small changes in input and output impedances and preserves an improved reverse-isolation cascode characteristic as the gain is controlled.

REFERENCES:
patent: 5999056 (1999-12-01), Fong
patent: 6211737 (2001-04-01), Fong
patent: 6255889 (2001-07-01), Branson
W.R. Davie and J.E. Solomon, “A High Performance Monolithic IF Amplifier Incorporating Electronic Gain Control” ISSCC Symposium, pp. 118-119, Feb. 16, 1968, Univ. Pennsylvania.
K. Fong, Dual-Band High-Linearity Variable Gain Low-Noise Amplifiers for Wireless Applications, ISSCC Symposium, (pp. 194-195, 224-225, 463), Feb. 1999.
Josef Fenk, “RF IC Design for Wireless Communication Systems”, Monterey, CA, 33-35, May 12-16, 1997.

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