Design and Simulation of Low Power Voltage Controlled Oscillator for Biomedical Applications

In current scenario the need of low power VLSI applications is of high importance for biomedical applications. Voltage Controlled Oscillator is one of the CMOS devices which is used in Phase Locked Loop circuits, clock circuits, frequency generation circuits etc. For biomedical applications (Pacemaker) frequency should be low in corresponding to the heartbeat. This paper presents a novel approach on frequency modulation in Voltage Controlled Oscillators. The design of Current Starved VCO is taken into consideration and various analysis is done in accordance to modulate the output oscillating frequency of a VCO. The normal frequency of oscillations of a VCO from 7.2 GHz is reduced to 1.3 Hz and less. Various analysis like Transient response, Frequency Response, Power and Parametric analysis has been observed through simulation results in 45nm CMOS Technology using Cadence Virtuoso Tool. Output frequency is analyzed with respect to varying input voltage in range of 0.5V to 1V using parametric analysis. An approach to use VCO as a low power, low frequency device for various applications is explored.