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Sensors 2017, 17(1), 140; doi:10.3390/s17010140

A Low Power Low Phase Noise Oscillator for MICS Transceivers

School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430000, China
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Author to whom correspondence should be addressed.
Academic Editors: Pak Kwong Chan and Holden King-Ho Li
Received: 22 July 2016 / Revised: 23 November 2016 / Accepted: 7 December 2016 / Published: 12 January 2017
(This article belongs to the Special Issue Smart Sensor Interface Circuits and Systems)
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Abstract

A low-power, low-phase-noise quadrature oscillator for Medical Implantable Communications Service (MICS) transceivers is presented. The proposed quadrature oscillator generates 349~689 MHz I/Q (In-phase and Quadrature) signals covering the MICS band. The oscillator is based on a differential pair with positive feedback. Each delay cell consists of a few transistors enabling lower voltage operation. Since the oscillator is very sensitive to disturbances in the supply voltage and ground, a self-bias circuit for isolating the voltage disturbance is proposed to achieve bias voltages which can track the disturbances from the supply and ground. The oscillation frequency, which is controlled by the bias voltages, is less sensitive to the supply and ground noise, and a low phase noise is achieved. The chip is fabricated in the UMC (United Microelectronics Corporation) 0.18 μm CMOS (Complementary Metal Oxide Semiconductor) process; the core just occupies a 28.5 × 22 μm2 area. The measured phase noise is −108.45 dBc/Hz at a 1 MHz offset with a center frequency of 540 MHz. The gain of the oscillator is 0.309 MHz/mV with a control voltage from 0 V to 1.1 V. The circuit can work with a supply voltage as low as 1.2 V and the power consumption is only 0.46 mW at a 1.8 V supply voltage. View Full-Text
Keywords: low power; low phase noise; oscillator; MICS low power; low phase noise; oscillator; MICS
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Li, D.; Liu, D.; Kang, C.; Zou, X. A Low Power Low Phase Noise Oscillator for MICS Transceivers. Sensors 2017, 17, 140.

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