A Fast AFC Loop with A Low Power Consumption, Low Phase Noise LC VCO

DOI

10.2991/icmt-13.2013.193How to use a DOI?

Keywords

LC VCO; low power; phase noise; auto current calibration; fast AFC;

Abstract

This paper presents a fast Automatic Frequency Calibration (AFC) Loop with a low power consumption low phase noise LC voltage controlled oscillator (VCO) at 4.8GHz for WSN Application. The VCO adopts complementary differential negative resistance structure with switch resistor biasing which achieves good phase noise performance and realizing low power consumption. The 6-bits switch resistors array is controlled by auto current calibration (ACC) to get smallest biasing current which can drive the divider-by-two. The 4-bit switch capacitor array provides wide tuning range. We utilize the high frequency prescaler output signal as a discriminating clock and use binary search algorithm to reduce AFC time. The AFC loop circuit is designed in TSMC 0.18 m RF-CMOS process. The post simulated phase noise is 119dBc/Hz@1MHz at frequency of 4.8GHz when the operating current of the VCO core is 0.35mA. The maximum AFC time is 21.8 s with 4-bit AFC. The whole chip size is 0.8×1.2mm2 with testing buffer and pads.

Copyright

© 2013, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Shu Jiayun
AU  - Li Zhiqun
PY  - 2013/11
DA  - 2013/11
TI  - A Fast AFC Loop with A Low Power Consumption, Low Phase Noise LC VCO
BT  - Proceedings of 3rd International Conference on Multimedia Technology(ICMT-13)
PB  - Atlantis Press
SP  - 1581
EP  - 1588
SN  - 1951-6851
UR  - https://doi.org/10.2991/icmt-13.2013.193
DO  - 10.2991/icmt-13.2013.193
ID  - Jiayun2013/11
ER  -