A wideband push-push VCO jusing a phase shifter in the common feedback loop

Author

Tanaka, Takayuki ; Tsutsumi, Masanori ; Aikawa, Masayoshi

Author_Institution

Saga Univ., Saga

fYear

2007

fDate

9-12 Oct. 2007

Firstpage

747

Lastpage

750

Abstract

In this paper, a very wideband push-push VCO using a phase shifter with varactor diodes is presented. In the circuit, the phase shifter is arranged in the common part of the positive feedback loops that 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 1.85 GHz (relative bandwidth =11.6 %). The phase noise is -97.7 to -103.3 dBc/Hz at the offset frequency of 1 MHz.

Keywords

microwave oscillators; phase shifters; varactors; voltage-controlled oscillators; Ku-band; common feedback loop; double-sided MIC structure; phase shifter; positive feedback loop; varactor diode; wideband push-push VCO; Circuit optimization; Diodes; Feedback circuits; Feedback loop; Frequency; Microwave integrated circuits; Phase shifters; Varactors; Voltage-controlled oscillators; Wideband; double-sided circuit technology; phase shifter; push-push oscillator; varactor diode; voltage controlled oscillator (VCO);

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2007. European

Conference_Location

Munich

Print_ISBN

978-2-87487-001-9

Type

conf

DOI

10.1109/EUMC.2007.4405300

Filename

4405300