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An AM-PM Noise Mitigation Technique in Class-C VCO

Kento KIMURA, Aravind THARAYIL NARAYANAN, Kenichi OKADA, Akira MATSUZAWA

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Kento KIMURA
Deparment of Physical Electronics, Tokyo Institute of Technology
Aravind THARAYIL NARAYANAN
Deparment of Physical Electronics, Tokyo Institute of Technology
Kenichi OKADA
Deparment of Physical Electronics, Tokyo Institute of Technology
Akira MATSUZAWA
Deparment of Physical Electronics, Tokyo Institute of Technology

Corresponding author

Keywords:VCO,Class-C,AM-PM conversion,parasitic capacitance,cross coupled pair,noise sensitivity

JOURNALRESTRICTED ACCESS

2015 Volume E98.CIssue 12Pages 1161-1170

DOIhttps://doi.org/10.1587/transele.E98.C.1161

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Published: December 01, 2015Manuscript Received: April 06, 2015Released on J-STAGE: December 01, 2015Accepted: -Advance online publication: -Manuscript Revised: July 11, 2015

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Article overview

Abstract

This paper presents a 20GHz Class-C VCO using a noise sensitivity mitigation technique. A radio frequency Class-C VCO suffers from the AM-PM conversion, caused by the non-linear capacitance of cross coupled pair. In this paper, the phase noise degradation mechanism is discussed, and a desensitization technique of AM-PM noise is proposed. In the proposed technique, AM-PM sensitivity is canceled by tuning the tail impedance, which consists of 4-bit resistor switches. A 65-nm CMOS prototype of the proposed VCO demonstrates the oscillation frequency from 19.27 to 22.4GHz, and the phase noise of -105.7dBc/Hz at 1-MHz offset with the power dissipation of 6.84mW, which is equivalent to a Figure-of-Merit of -183.73dBc/Hz.

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