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High-frequency voltage-controlled-oscillator for use with inverted-mesa quartz resonators

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1 Author(s)
Wessendorf, K.O. ; Sandia Nat. Labs., Albuquerque, NM, USA

An oscillator circuit has been developed at Sandia National Laboratories that uses inverted-mesa resonators, in a high-precision VCO application, at frequencies historically dominated by SAW designs. This design incorporates a frequency tripler that provides a 600 MHz output capability using a 200 MHz 3rd overtone resonator. This design has some advantages over equivalent SAW alternatives: lower power-consumption, superior aging characteristics, linear frequency pulling and low frequency versus temperature sensitivity. The VCO presented demonstrates >+/-60 ppm pullability (0 to 7V control), tuning linearity better than +/-5% with phase noise at 1 kHz <-110 dBc/Hz. This oscillator-tripler exploits the nonlinear characteristics of an emitter-coupled-pair differential amplifier to obtain a high-performance oscillator design

Published in:

Frequency Control Symposium, 1996. 50th., Proceedings of the 1996 IEEE International.

Date of Conference:

5-7 Jun 1996