Linear frequency tuning of SAW resonators
| Autor: | M.M. Driscoll |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Physics
Engineering Acoustics and Ultrasonics business.industry Acoustics Surface acoustic wave Electrical engineering Linearity Physics::Classical Physics Inductance Resonator Optoelectronics Flicker noise Electrical and Electronic Engineering Center frequency business Frequency modulation Instrumentation Varicap Electrical impedance Phase shift module Diode Voltage |
| Zdroj: | IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control. 38:366-369 |
| ISSN: | 0885-3010 |
| Popis: | Linear, voltage-frequency tuning of SAW resonators with 500-p.p.m. tuning range using conventional, abrupt-junction varactor diodes is shown to be possible. The technique implemented uses varactor diode parallel inductance to provide a linear reactance vs. voltage network, which is effectively connected in series with the resonator motional impedance. Typical tuning ranges are significantly larger than those achievable using the phase-shifter approach, and are on the order of 300-500 p.p.m. for the 320-MHz resonator used. Experimental measurements indicate no resultant degradation in oscillator short-term frequency stability when a low flicker noise-sustaining stage is utilized. The achievable degree of tuning will allow nonovenized, phase-locked, and/or temperature-compensated oscillator operation over a wide temperature range. Low-distortion, oscillator-signal FM modulation is also possible. > |
| Databáze: | OpenAIRE |
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