Design of a 4 GHz quadrature LC -VCO with transformer coupling

Author

Xiushan, Wu ; Zhigong, Wang ; Zhiqun, Li ; Qing, Li

Author_Institution

Coll. of Electr. & Mech. Eng. of China, Jiliang Univ., Hangzhou

Volume

2

fYear

2008

fDate

21-24 April 2008

Firstpage

855

Lastpage

858

Abstract

A 4 GHz quadrature voltage-controlled oscillator (QVCO) topology is proposed where a planar spiral transformer is used as coupling terminals. Two identical LC oscillators are cross-coupled by the transformer to generate the quadrature outputs. The transformer also serves as filtering network for the oscillators to improve the phase noise performance. The quadrature oscillator based on the proposed topology with additional design ideas has been implemented in a 0.18 um mixed-signal 1P6M CMOS technology for 4 GHz-band operation. The simulation gave a phase noise of -122 dBc/Hz at 1 MHz offset with an output power of 1 dBm, while dissipating 7.8 mA under a 1.8 V supply.

Keywords

CMOS integrated circuits; MMIC oscillators; couplings; integrated circuit design; mixed analogue-digital integrated circuits; phase noise; transformers; voltage-controlled oscillators; current 7.8 mA; filtering network; frequency 1 MHz; frequency 4 GHz; phase noise performance; planar spiral transformer; quadrature LC-VCO; quadrature voltage-controlled oscillator topology; size 0.18 mum; transformer coupling; voltage 1.8 V; CMOS technology; Educational institutions; Mechanical engineering; Network topology; Phase noise; Power dissipation; Ring oscillators; Signal generators; Transceivers; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave and Millimeter Wave Technology, 2008. ICMMT 2008. International Conference on

Conference_Location

Nanjing

Print_ISBN

978-1-4244-1879-4

Electronic_ISBN

978-1-4244-1880-0

Type

conf

DOI

10.1109/ICMMT.2008.4540536

Filename

4540536