Low Power and High Frequency Voltage Controlled Oscillator for PLL Application

This paper presents NMOS-DTMOS Technique for designing ring voltage controlled oscillator (RVCO) for low power PLL application. A 1.2 GHz RVCO is designed in SCL 180nm CMOS technology. By using DTMOS technique switching of MOSFET is improved. Power switching is used to improved the power dissipation of proposed RVCO. A single ended five stage power switching RVCO is designed for frequency of 1.22 GHz with 1mW power Dissipation. The Phase Noise at 1MHz offset frequency is -94dBc/Hz.