A Low Phase Noise, Low Power and Wide Tuning Range VCO with Filtering Technique in ISM Band

Abbas Majdabadi,Masoud Sabaghi,Saeid Marjani

doi:10.4236/cs.2016.72006

Abstract

In this paper, a novel voltage controlled oscillator (VCO) with low phase noise, low power consumption and wide tuning range in the industrial, scientific and medical (ISM) band is proposed for communication systems applications. For improving the phase noise, filtering technique is used and VCO is designed with TSMC CMOS 0.18 μm technology and the power supply is 1.5 V. The simulation results with advanced design system (ADS) shows that phase noise in 1 MHz offset frequency from the carrier is -122 dBc/Hz and tuning range is 2 to 2.8 GHz. The power consumption of the core is 2.49 mW.

Highlights

One of the most important parts in transmitters is phase locked loop (PLL), and their performance is strongly influenced by the voltage controlled oscillators (VCO) [1]
VCO is one of the most difficult circuits to integrate for the following reasons: 1) poor quality factor of the monolithic inductor; 2) limited tuning range of the varactor; and 3) poor flicker noise in CMOS technology compared with the other technologies such as SiGe HBT [34]
The proposed VCO is simulated by Advanced Design System (ADS) in TSMC 0.18 μm CMOS process

Summary

Introduction

One of the most important parts in transmitters is phase locked loop (PLL), and their performance is strongly influenced by the voltage controlled oscillators (VCO) [1]. (2016) A Low Phase Noise, Low Power and Wide Tuning Range VCO with Filtering Technique in ISM Band. VCO is one of the most difficult circuits to integrate for the following reasons: 1) poor quality factor of the monolithic inductor; 2) limited tuning range of the varactor; and 3) poor flicker noise in CMOS technology compared with the other technologies such as SiGe HBT [34]. The important goals in designing of VCO are low power dissipation, low phase noise and wide tuning range. With using the filtering technique and good selecting of the inductor and the varactor, a LC-VCO with low power (2.49 mW), low phase noise (−122 dBc/Hz) and wide band is proposed.

Proposed Voltage-Controlled Oscillator

Simulation Results

Conclusion