Radio-frequency variable attenuator

Details Radio-frequency variable attenuator Radio-frequency variable attenuator

H - Electricity

03

G

H03G 11/00 (2006.01) H03H 11/24 (2006.01)

Patent

CA 2263225

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.

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