A low pass T-section digital shifter apparatus
Abstract
A low pass T-section digital phase shifter apparatus has a pair of serially connected inductor-diode combinations connected in series which includes a parallel circuit connected between the common junction and ground. The parallel circuit has an inductor in parallel with a series capacitor and diode to provide a balanced insertion loss at each diode switching state. When the diodes are in the forward-biased state, they act as closed short circuit switches. When the diodes are reversed-biased, the inductance in the series circuit resonates with the diode capacitance to provide a short circuit path to the RF signal to pass the center frequency of the RF signal at the desired phase.
- Publication:
-
Patent Application Department of the Air Force
- Pub Date:
- August 1985
- Bibcode:
- 1985pad..reptV....Y
- Keywords:
-
- Capacitance Switches;
- Diodes;
- Phase Shift Circuits;
- Radio Frequencies;
- Short Circuits;
- Switching;
- Bias;
- Frequencies;
- Inductance;
- Insertion Loss;
- Patent Applications;
- Electronics and Electrical Engineering