>300GHz fixed-frequency and voltage-controlled fundamental oscillators in an InP DHBT process

Abstract

We report fundamental fixed-frequency and voltage-controlled oscillators operating at >300GHz fabricated in a 256nm InP DHBT technology. Oscillator designs are based on a differential series-tuned topology followed by a common-base buffer. Measured oscillation frequencies of fixed-frequency designs are 267.4, 286.8, 310.2, and 346.2GHz, at PDC=35mW. At optimum bias, the output power was measured to be −5.1, −6.9, −9.2, and −11.0 dBm for each design (no probe loss correction), with PDC≤115mW. Measured phase noise was −96.6dBc/Hz at 10MHz offset. Varactor-tuned designs demonstrated 10.6–12.3 GHz of tuning bandwidth.