학술논문
Frequency Domain Phase Shift Measurement Technique Applied to a Multiphase Rotary Travelling-Wave VCO
Document Type
Periodical
Author
Source
IEEE Microwave and Wireless Components Letters IEEE Microw. Wireless Compon. Lett. Microwave and Wireless Components Letters, IEEE. 25(12):820-822 Dec, 2015
Subject
Language
ISSN
1531-1309
1558-1764
1558-1764
Abstract
In this letter, the design of a multiphase 18.5 GHz Rotary Travelling-Wave Oscillator (RTWO) is presented. Lack of symmetry in such a structure can result in oscillation in a standing wave rather than the travelling wave mode. In order to determine the mode of the signal, before going through the time consuming steps of time domain phase shift measurement, we have proposed a preliminary phase shift measurement technique in the frequency domain for a high frequency RTWO. This new technique was verified against direct phase measurements for a multiphase RTWO fabricated in a 0.25 $\mu{\rm m}$ BiCMOS process with good agreement. In other measurements, the VCO achieved a tuning range of 1.1 GHz and output power of $-$5.3 ${\rm dBm}$.