Low Power Voltage Controlled Oscillator for PLL using Operational Transconductance Amplifier

International Journal of Research and Scientific Innovation (IJRSI) | Volume VI, Issue III, March 2019 | ISSN 2321–2705

Low Power Voltage Controlled Oscillator for PLL using Operational Transconductance Amplifier

Sruthin Balachandran V V, Raghavendra Havaldar

Assistant Professor, Department of Electronic and Communication, AJ Institute of Engineering and Technology, Mangaluru 575006, Karnataka, India

Abstract:-Voltage Controlled Oscillator (VCO) using Operational Transconductance Amplifier (OTA) for Phase Locked Loop (PLL) is designed in 180 nm technology. The designed VTO has a voltage to current converter (V-I converter), a Current Controlled Oscillator (CCO) and three CMOS inverters. The CCO design is based on single ended rail to rail OTA The free running frequency range of OTA based VCO is 60 to 435 MHz. The design of the circuit is done using Cadence VLSI design suite and this VCO is power efficient and would result in a low cost compact IC when fabricated.

Keywords— Cadence VLSI design suite; OTA; PLL; VCO.

I. INTRODUCTION

Phase Locked Loop is one of the mostly used circuit for various applications such as clock generator for processors, in frequency synthesizer, in FM demodulating circuit ect. [1].
It is used to generate high frequency stable output signal from a fixed low-frequency signal.
A PLL is a combination of Phase Frequency Detector (PFD), Charge Pump, Loop Filter, VCO, and a Frequency Divider (which is usually connected externally). Because of the frequency matching performance has to be performed by the VCO and it is the major part in PLL circuit, VCO decides the power consumed and area occupied by the PLL [1].

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