Radio-frequency variable attenuator

Details Radio-frequency variable attenuator Radio-frequency variable attenuator

1999-02-26

2000-11-14

Gensler, Paul

Wave transmission lines and networks

Attenuators

330284, 327308, H03H 724

Patent

active

061475688

ABSTRACT:
A variable attenuator comprises bipolar transistors Q1 and Q2 connected in reverse parallel between a point 1 and ground potential G. The base electrodes of the transistors Q1 and Q2 are biased independently by a control circuit 3. The collector of transistor Q1 and the emitter of transistor Q2 are commonly connected to a bias voltage provided by resistor R2 and voltage source Vr. The attenuator provides means by which the linearity, gain, power handling capabilities and noise figure of a front-end receiver can be altered. The attenuator is susceptible to integration in, for example, a radio receiver front-end.

REFERENCES:
patent: 3902077 (1975-08-01), Takemura et al.
patent: 4055818 (1977-10-01), Gay
patent: 4564863 (1986-01-01), Chameroy et al.

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