Low noise amplifier

Details Low noise amplifier Low noise amplifier

1997-06-11

1999-08-03

Mottola, Steven J.

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

330311, H03F 3191

Patent

active

059330570

ABSTRACT:
The invention relates to a low noise amplifier comprising an input stage and an output stage. The input matching and amplification of the amplifier are carried out by means of a common-base amplifier stage in a first cascade. An additional improvement is the use of a White's cascode with a high input impedance as a second stage of the cascade for matching the high output impedance of the common-base stage. The White's cascode also has a very low and stable output impedance, which serves the output matching very well. Furthermore, both stages have been so modified according to the invention that the collectors of their amplifier transistors are connected to the operating voltage by means of coils instead of resistors.

REFERENCES:
patent: 3805164 (1974-04-01), Callaway
patent: 3886467 (1975-05-01), Watanabe et al.
patent: 3973214 (1976-08-01), Rheinfelder
patent: 4890069 (1989-12-01), Duffalo et al.
O.V. Golovin and I. Khardon Agilar, "Methods of Improving Amplifier Linearity in Professional SW Receivers", Telecommunications & Radio Engineering, vol. 38/39 (1984), Jan., No. 1, Silver Spring, MD, USA, pp. 69-74.

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