High-Frequency CNTFET-Based Voltage-Controlled Oscillator for PLL Application

Abstract

In this paper, a high-frequency differential ring dual-delay voltage-controlled oscillator (DR-VCO) is proposed. This 9 GHz DR-VCO is designed using 45 nm CNTFET technology. CNTFET is faster than MOSFET, and hence it provides a high tuning range. VCO with four-delay cells is designed in this work. This design consists of four-stage delay cells, and every delay cell is designed on dual-delay path topology. This topology results in high-output oscillation frequency which includes the range from 3 to 9 GHz. The observed phase noise at offset of 1 MHz frequency is −66 dBc/Hz.