A 300-MHz-Band, Sub-1 V and Sub-1 mW CMOS SAW Oscillator Suitable for Use in RF Transmitters

Minoru KOZAKI  Norio HAMA  

IEICE TRANSACTIONS on Electronics   Vol.E88-C   No.4   pp.502-508
Publication Date: 2005/04/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.4.502
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Low-Power LSI and Low-Power IP)
Category: Analog
ultra low power,  fully depleted SOI,  SAW oscillator,  remote keyless entry,  

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An ultra low power CMOS SAW oscillator in the 300-MHz-band that operates on a sub-1 V supply voltage and at sub-1 mW power consumption has been developed. The SAW oscillator is fabricated in a 0.35-µm fully depleted SOI (FD-SOI) process with low voltage operation capability. The SAW oscillator is configured as a type of Colpitts oscillator but consists of 3 cascaded amplifiers instead of a single amplifier. Although the circuit configuration is quite similar to the conventional Colpitts oscillator, this proposed configuration generates an excessively high negative resistance that even exceeds the theoretical limit of the conventional one.