Analysis and Design of a Low-Phase Noise QVCO in 0.18um CMOS Technology for mobile Transceivers

Subject Areas :

Saeed Aalipoor ¹ , Najmeh Cheraghi Shirazi ² , R. Hamzehyan ³

1 - Islamic Azad University Bushehr Branch
2 - Electrical Engineering, Islamic Azad University Bushehr Branch, Bushehr, Iran
3 - Islamic Azad University Boushehr Branch

Received: 2015-04-21 Accepted : 2015-11-11 Published : 2016-02-02

Keywords:

Abstract :

This article presents analysis and design quadrature voltage controlled oscillator (QVCO) for 3G transceiver in 0.18um CMOS.The proposed VCO consist of two NMOS cross coupled voltage controlled oscillators (VCO). The main idea in the proposed QVCO is to used the intrinsic capacitance of the cross coupled transistoer as coupling elements,because of avoiding flicker noise of transistor, can be injected through the body of the main transistor (cross coupled).in other word, applying a differential output of the one VCO to body of other VCO’s cross coupled transistors. the frequency of proposed QVCO is tuneable from 1.886GHZ to 2.272GHZ as the tuning voltage is varied from 0.0V to 0.8V.At the supply voltage of 0.8V, the total power consumption is 7.67mW. The achieved phase noise at 1MHZ frequency offset is -143.49dBc/HZ at the oscillation frequency of 1.923GHZ and the figure of merit (FOM) of the proposed QVCO is -199.6dBc/HZ.