A Class-F CMOS Oscillator
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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: | VCO; Transformer; Class-F oscillator; Impulse sensitivity function; Phase noise; Digitally controlled oscillator | DOI: | 10.1109/JSSC.2013.2273823 | Language: | en | Status of Item: | Peer reviewed |
Appears in Collections: | Electrical and Electronic Engineering Research Collection |
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