A 275‐GHz push–push voltage‐controlled oscillator with −3.2 dBm output power using capacitance splitting feedback technique in 40‐nm CMOS

In this letter, we present a 275‐GHz push–push voltage‐controlled oscillator (VCO) employing the capacitance splitting feedback (CSF) technique. The proposed CSF technique improves the oscillation frequency as well as the oscillator's harmonic output power and DC‐RF efficiency. The proposed VCO is fabricated in 40‐nm CMOS technology. From the measurement, a high output power of −3.2 dBm is achieved at 273.6 GHz with a frequency tuning range of 2.47% and a DC‐RF efficiency of 1.26%.