Patent ID: 9584096
Date: 2017-02-28
CPC Classifications: H03H,H04L

Claim:
1. A digital step attenuator comprising: a radio frequency input terminal; a radio frequency output terminal; an attenuation control circuit configured to generate a plurality of mode control signals operable to control an amount of attenuation between the radio frequency input terminal and the radio frequency output terminal; and a plurality of attenuation stages configured to receive the plurality of mode control signals, the plurality of attenuation stages arranged in a cascade between the radio frequency input terminal and the radio frequency output terminal, the plurality of attenuation stages including a first attenuation stage including an attenuation circuit, a bypass switching circuit, and a plurality of phase compensation capacitors configured to compensate for a phase difference between a first signal path through the attenuation circuit from a stage input to a stage output and a second signal path through the bypass switching circuit from the stage input to the stage output, the plurality of phase compensation capacitors including a first phase compensation capacitor and a second phase compensation capacitor electrically connected in series with one another between the stage input and the stage output.