Title :
A push-push VCO using a phase shifter with 90° branch line hybrid circuit
Author :
Tanaka, Takayuki ; Mizoguchi, Shuhei ; Kawasaki, Kengo ; Aikawa, Masayoshi
Author_Institution :
Dept. of Electr. & Electron. Eng., Saga Univ., Saga, Japan
Abstract :
In this paper, a wideband push-push VCO using a phase shifter is presented. The phase shifter consists of a 90° branch line hybrid circuit and varactor diodes. The oscillator is a positive feedback type oscillator. In the oscillator, the oscillating frequency can be changed by using the phase shifter as the electrical length of the feedback loops determine the oscillating frequency. The circuit structure is very simple and compact due to the double-sided MIC structure. This type of push-push oscillator is suitable for a wideband VCO compared with a negative resistance type one. In the experiment, the developed push-push VCO in Ku-band achieves wide tuning frequency range of 1.2 GHz (relative bandwidth =7.5%).
Keywords :
circuit feedback; circuit tuning; negative resistance; phase shifters; varactors; voltage-controlled oscillators; Ku-band; branch line hybrid circuit; circuit structure; double-sided MIC structure; electrical length; feedback loop; frequency 1.2 GHz; negative resistance; oscillating frequency; phase shifter; positive feedback type oscillator; tuning frequency; varactor diode; voltage controlled oscillator; wideband push-push VCO; Harmonic analysis; Phase shifters; Power generation; Tuning; Varactors; Voltage-controlled oscillators; branch line hybrid circuit; double-sided MIC technology; phase shifter; push-push oscillator; varactor diode; voltage controlled oscillator (VCO);
Conference_Titel :
Antenna Technology and Applied Electromagnetics & the American Electromagnetics Conference (ANTEM-AMEREM), 2010 14th International Symposium on
Conference_Location :
Ottawa, ON
Print_ISBN :
978-1-4244-5049-7
Electronic_ISBN :
978-1-4244-5050-3
DOI :
10.1109/ANTEM.2010.5552560
