A new technique for the temperature compensation of SAW oscillators

Author

Cracknell, M.P. ; Harrison, A.M. ; Sharpe, D.J.

Author_Institution

STC Components, Harlow, UK

fYear

1989

fDate

10-13 Apr 1989

Firstpage

49

Lastpage

52

Abstract

A new method for the compensation of surface acoustic wave (SAW) oscillators is described. This work is a development of a technique first used for the compensation of oscillators employing AT-cut bulk wave resonators. The benefits that result for SAW oscillators are high compensation performance, low power consumption, low complexity and relatively small physical size. Compensation is achieved by the application of a control voltage to the oscillator, such that the oscillators frequency remains constant for variations in temperature. A custom bipolar integrated circuit has been designed which generates a power series representation of the control voltage. Prototype oscillators have been constructed at 600 MHz and show a compensated performance of +/- 3 p.p.m. over a 120 deg C operating temperature range (-40 to 80 deg C). The potential to improve the performance to better than +/-2 p.p.m. exists

Keywords

compensation; crystal resonators; frequency control; frequency stability; oscillators; surface acoustic wave devices; variable-frequency oscillators; -40 to 80 C; 600 MHz; SAW VCO; SAW oscillators; UHF; compensated performance; control voltage; custom bipolar integrated circuit; high compensation performance; low complexity; low power consumption; operating temperature range; power series representation; power series voltage control signal; small physical size; temperature compensation;

fLanguage

English

Publisher

iet

Conference_Titel

Frequency Control and Synthesis, 1989. Second International Conference on

Conference_Location

Leicester

Type

conf

Filename

20760