Analysis and design of oscillators based on low-voltage self-oscillating active inductors
Szczepkowski, Grzegorz and Farrell, Ronan (2010) Analysis and design of oscillators based on low-voltage self-oscillating active inductors. In: ISSC 2010, June 23–24 2010, UCC, Cork, Ireland.
This paper presents a new consistent analysis of self-oscillating active in- ductors together with a complete design example of a 90 nm CMOS current controlled oscillator (CCO) for ISMapplications. Using the proposed passive compensation method in place of a standard negative impedance converter, typical performance of active induc- tor oscillator is achieved with reduced static power consumption. The article presents a small signal, large signal and phase noise analysis of the proposed oscillator together with related design trade-offs. Theoretical results are confirmed by a simulation of cur- rent controlled oscillator designed using UMC 90 nm 1P9M RF process libraries. The proposed circuit achieves a relative tuning range of 26% with a 434 MHz carrier fre- quency and average in band phase noise of -92 dBc/Hz at 1 MHz offset. The maximum power consumption of the oscillator core is only 2 mW from a 1 V supply.
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