Title :
A K-band quadrature VCO based on asymmetric coupled transmission lines
Author :
Kim, Choul-Young ; Yang, Jaemo ; Kim, Dong-Wook ; Hong, Songcheol
Author_Institution :
School of EECS, Korea Advanced Institute of Science and Technology (KAIST), 373-1, Guseong-dong, Yuseong-gu, Daejeon, 305-701, Republic of Korea
Abstract :
A K-band quadrature voltage-controlled oscillator (QVCO) based on asymmetric coupled transmission lines is presented. Asymmetric coupled transmission lines are used to couple two identical LC tank oscillators for generation of a quadarature signal with comparable phase noise with reported QVCOs at the frequencies. The fabricated QVCO using InGaP/GaAs HBT technology shows the oscillation frequencies from 22.07 to 22.9 GHz. The frequency tuning range is about 830 MHz. The peak output power is 6 dBm. The phase noise of - 121.17 dBc/Hz at 1 MHz offset and 185.6 of FOM are achieved at the operating frequency of 22.83 GHz.
Keywords :
gallium arsenide; heterojunction bipolar transistors; indium compounds; transmission lines; voltage-controlled oscillators; HBT technology; InGaP-GaAs; K-band quadrature VCO; LC tank oscillators; asymmetric coupled transmission lines; frequency 22.07 GHz to 22.9 GHz; Couplings; Frequency; Gallium arsenide; Heterojunction bipolar transistors; K-band; Phase noise; Power transmission lines; Signal generators; Transmission lines; Voltage-controlled oscillators; Asymmetric coupled transmission line; QVCO; VCO; oscillator; quadrature; transformer;
Conference_Titel :
Microwave Symposium Digest, 2008 IEEE MTT-S International
Conference_Location :
Atlanta, GA
Print_ISBN :
978-1-4244-1780-3
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2008.4633178
