Widebandwidth IMPATT and Gunn Voltage Tuned Oscillators

This paper describes circuit techniques for obtaining wide frequency tuning capability from IMPATT and Gunn devices using varactor tuning. Using the coaxial circuit described here, an IMPATT VTO with a half octave tuning bandwidth (35%) was developed and a Gunn oscillator with a 52% bandwidth was achieved. Similar results have been reported previously by Large for a Gunn device circuit. The circuit described here applies equally well to IMPATT devices.