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Analytical model for CMOS cross-coupled LC-tank oscillator

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2 Author(s)
Mojtaba Daliri ; Electr. Eng. Dept., Ferdowsi Univ. of Mashhad, Mashhad, Iran ; Mohammad Maymandi-Nejad

Periodic steady-state behaviour of cross-coupled LC-tank oscillator is of critical importance in ultra-low power, low-voltage transceiver circuits. Understanding the major factors affecting amplitude, oscillation frequency and power consumption would lead to more optimised oscillator design particularly for short-range wireless transceivers. This study presents a new approach for evaluating the amplitude of the main component, oscillation frequency and power consumption of cross-coupled LC-tank oscillator. Three major factors, affecting oscillator functionality are examined. In order to obtain a general design methodology, the effects of oscillator parameters such as transistors' sizes, inductor and capacitor values are investigated. An intuitive discussion about oscillator behaviour and a design procedure are presented. The theoretical results are verified by circuit simulations in the 0.18 μm CMOS process.

Published in:

IET Circuits, Devices & Systems  (Volume:8 ,  Issue: 1 )