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delay-line-discriminators
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Phase-noise measurement of microwave oscillators using phase-shifterless delay-line discriminator
, Article IEEE Transactions on Microwave Theory and Techniques ; Volume 58, Issue 2 , January , 2010 , Pages 468-477 ; 00189480 (ISSN) ; Banai, A ; Sharif University of Technology
2010
Abstract
In this paper, a modified method based on the frequency discriminator technique for measuring phase noise of microwave oscillators is presented. In the proposed method, the phase shifter is omitted. In contrast, a 90° hybrid with one more channel containing a phase detector, and a low-noise amplifier is added to the measurement setup. It can be said that an in-phase/quadrature phase-noise detection has been developed. With the proposed method, tuning of the variable phase shifter is not needed anymore. Therefore, the measurement is done automatically, and as a result, the measurement time is decreased. Another considerable advantage of this method is that the method is theoretically...
Sensitivity improvement of Phase-Noise Measurement of mcrowave oscillators using if delay line based discriminator
, Article IEEE Microwave and Wireless Components Letters ; Volume 26, Issue 7 , 2016 , Pages 546-548 ; 15311309 (ISSN) ; Banai, A ; Farzaneh, F ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
Abstract
The conventional delay-line discriminator method for phase noise measurement is modified to achieve better sensitivity. In the proposed technique, to decrease delay-line loss, the under-test oscillator's microwave frequency is down-converted by another oscillator, and delay-line is implemented in the IF range. Full validation of the technique is presented. In adition, we experimentally demonstrate that system sensitivity is considerably improved compared to the conventional method