A 20-Ghz Differential Push-Push Vco For 60-Ghz Frequency Synthesizer Toward 256 Qam Wireless Transmission In 65-Nm Cmos

This paper present a 20-GHz differential push-push voltage controlled oscillator (VCO) for 60-GHz frequency synthesizer. The 20-GHz VCO consists of a 10-GHz in-phase injection-coupled QVCO (IPIC-QVCO) with tail-filter and a differential output push-push doubler for 20-GHz output. The VCO fabricated in 65-nm CMOS technology, it achieves tuning range of 3 GHz from 17.5 GHz to 20.4 GHz with a phase noise of -113.8 dBc/Hz at 1MHz offset. The core oscillator consumes up to 71-mW power and a FoM of -180.2 dBc/Hz is achieved.