| CPC H03H 11/24 (2013.01) [G01K 3/08 (2013.01); G01K 7/01 (2013.01); H03H 7/256 (2013.01); H03K 17/60 (2013.01)] | 20 Claims |

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1. A variable attenuator circuit comprising:
a plurality of varactor diodes configured to attenuate a radio frequency (RF) signal between an RF input and an RF output, the plurality of varactor diodes being arranged in a pi-type attenuator configuration;
a reference voltage input; and
a control voltage input configured to vary the attenuation of the variable attenuator circuit based upon a control voltage.
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