A Class-F CMOS Oscillator

Files in This Item:
File Description SizeFormat 
2013-12_jssc_babaie_class-f-osc.pdf3.96 MBAdobe PDFDownload
Title: A Class-F CMOS Oscillator
Authors: Babaie, Masoud
Staszewski, Robert Bogdan
Permanent link: http://hdl.handle.net/10197/8419
Date: 7-Aug-2013
Online since: 2017-04-06T15:46:25Z
Abstract: An oscillator topology demonstrating an improved phase noise performance is proposed in this paper. It exploits the time-variant phase noise model with insights into the phase noise conversion mechanisms. The proposed oscillator is based on enforcing a pseudo-square voltage waveform around the LC tank by increasing the third-harmonic of the fundamental oscillation voltage through an additional impedance peak. This auxiliary impedance peak is realized by a transformer with moderately coupled resonating windings. As a result, the effective impulse sensitivity function (ISF) decreases thus reducing the oscillator's effective noise factor such that a significant improvement in the oscillator phase noise and power efficiency are achieved. A comprehensive study of circuit-to-phase-noise conversion mechanisms of different oscillators' structures shows the proposed class-F exhibits the lowest phase noise at the same tank's quality factor and supply voltage. The prototype of the class-F oscillator is implemented in TSMC 65-nm standard CMOS. It exhibits average phase noise of -136 dBc/Hz at 3 MHz offset from the carrier over 5.9-7.6 GHz tuning range with figure-of-merit of 192 dBc/Hz. The oscillator occupies 0.12 mm2 while drawing 12 mA from 1.25 V supply.
Funding Details: European Research Council
Type of material: Journal Article
Publisher: IEEE
Journal: IEEE Journal of Solid-State Circuits
Volume: 48
Issue: 12
Start page: 3120
End page: 3133
Copyright (published version): 2013 IEEE
Keywords: VCOTransformerClass-F oscillatorImpulse sensitivity functionPhase noiseDigitally controlled oscillator
DOI: 10.1109/JSSC.2013.2273823
Language: en
Status of Item: Peer reviewed
Appears in Collections:Electrical and Electronic Engineering Research Collection

Show full item record

Citations 5

Last Week
Last month
checked on Feb 20, 2019

Download(s) 50

checked on May 25, 2018

Google ScholarTM



This item is available under the Attribution-NonCommercial-NoDerivs 3.0 Ireland. No item may be reproduced for commercial purposes. For other possible restrictions on use please refer to the publisher's URL where this is made available, or to notes contained in the item itself. Other terms may apply.