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An Integrated LC Oscillator with Self Compensation for Frequency Drift and PVT Corners Variations

Guilherme, J.G. ; Zangpo, J. Z. ; Póvoa , R. P. ; Horta, N.

An Integrated LC Oscillator with Self Compensation for Frequency Drift and PVT Corners Variations, Proc IEEE International Conf. on Electronics, Circuits and Integrated Systems - ICECS, Bordeaux, France, Vol. 1, pp. 333 - 336, December, 2018.

Digital Object Identifier: 978-1-5386-9562-3/18/$31.00

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Abstract
This work addresses the design of integrated LC oscillators with a central frequency of 1.024 GHz and frequency drift compensation suitable for space applications. The circuit uses a frequency divider, to have an output of 16 MHz allowing to replace an equivalent crystal oscillator. In order to compensate the frequency drift with temperature, a voltage controller connected to a varactor is used. Moreover, to compensate for variations due to PVT corners, a calibration structure is considered. A temperature sensor generates the reference voltage to be used by the voltage controller. The designed LC Oscillator dissipates 27.8mW, while exhibiting ±256ppm frequency error over a temperature range between -10 oC and 90 oC and voltage supply variations of ±10%. The LC Oscillator was designed using a standard 130 nm CMOS Technology.