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Open Access
A Pulse-Tail-Feedback LC-VCO with 700Hz Flicker Noise Corner and -195dBc FoM

Aravind Tharayil NARAYANAN, Kenichi OKADA

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Summary :

This paper proposes a pulse-tail-feedback VCO, in which the tail transistor is driven using pulse-shaped voltage signals with rail-to-rail swing. The proposed pulse-tail-feedback (PTFB) VCO relies on reducing the current conduction period of the tail transistor and operating the tail transistors in triode region for reducing the flicker and thermal noise from the active elements. Mathematical analysis and circuit level simulations of the phase noise mechanism in the proposed PTFB-VCO is also presented in this paper for validating the effectiveness of the proposed technique. A prototype LC-VCO with the proposed PTFB technique is fabricated in a standard 180nm CMOS. Laboratory measurement shows a power consumption of 1.35mW from a 1.2V supply at 4.6GHz. The proposed PTFB-VCO achieves a flicker corner of 700Hz, which enables the VCO to maintain a fairly constant figure-of-merit (FoM) of -195dB within a wide offset frequency range of 1kHz-10MHz.

Publication
IEICE TRANSACTIONS on Electronics Vol.E102-C No.7 pp.595-606
Publication Date
2019/07/01
Publicized
Online ISSN
1745-1353
DOI
10.1587/transele.2018ECP5044
Type of Manuscript
PAPER
Category
Electronic Circuits

Authors

Aravind Tharayil NARAYANAN
  Tokyo Institute of Technology
Kenichi OKADA
  Tokyo Institute of Technology

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