DIGITALLY CONTROLLED ATTENUATORS WITH LOW PHASE SHIFT

摘要

Digitally controlled attenuators with low phase shift are provided herein. In certain configurations, a digitally controlled attenuator includes an attenuation circuit electrically connected between an input terminal and an output terminal, a bypass circuit electrically connected in parallel with the attenuation circuit between the input terminal and the output terminal, and a plurality of phase compensation capacitors including a first phase compensation capacitor and a second phase compensation capacitor electrically connected in series between the input terminal and the output terminal. The bypass circuit is configured to receive a mode control signal for selecting the bypass circuit to control an amount of attenuation between the input terminal and the output terminal. Additionally, the phase compensation capacitors are operable to compensate for a phase difference between a first signal path through the attenuation circuit and a second signal path through the bypass circuit.

主权项

1. A digitally controlled attenuator comprising:
an attenuation circuit electrically connected between an input terminal and an output terminal; a bypass circuit electrically connected in parallel with the attenuation circuit between the input terminal and the output terminal, the bypass circuit configured to receive a mode control signal for selecting the bypass circuit to control an amount of attenuation between the input terminal and the output terminal; and a plurality of phase compensation capacitors including a first phase compensation capacitor and a second phase compensation capacitor electrically connected in series between the input terminal and the output terminal, the plurality of phase compensation capacitors operable to compensate for a phase difference between a first signal path through the attenuation circuit and a second signal path through the bypass circuit.