Oscillator comprising two one-port surface wave resonators
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United States of America Patent
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Mar 31, 2009
Grant Date -
May 8, 2008
app pub date -
Dec 13, 2005
filing date -
Dec 14, 2004
priority date (Note) -
Expired
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Abstract
The invention relates to an oscillator containing two one-port surface wave resonators as frequency-determining elements. The aim of the invention is to modify known oscillators such that the variable /S21/ for the oscillator frequency, that is adapted according to the respective temperature, only slightly depends on the temperature. The inventive oscillator is characterized in that, in relation to a pre-determined temperature, the first-order temperature coefficients of the synchronous frequency of the two one-port surface wave resonators (2; 3; 12; 13; 42; 43) have different signs or are equal to zero, and the second-order temperature coefficients of the synchronous frequency of the two one-port surface wave resonators have the same signs. The circuit consisting of the two one-port surface wave resonators is either two-terminal or four-terminal. The relationship between the openings in the converters and the relationship between the number of teeth are selected in such a way that, in the operating temperature range of the oscillator, the influence of the temperature on the oscillator frequency is kept to a minimum.
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