Patent ID: 7692517

Claim:
An oscillator comprising a composite of two frequency-determining elements, each element comprising at least one interdigital converter for acoustic surface waves, a feedback from an output to an input of the composite including an amplifier, and the frequency-determining elements differing from one another due to a temperature dependence of the synchronous frequency wherein: a) the frequency-determining elements are first and second acoustic surface wave resonators; b) first-order temperature coefficients of the synchronous frequencies of the two surface wave resonators have different algebraic signs and second-order temperature coefficients of the synchronous frequencies of the two surface wave resonators have the same algebraic sign, or the second-order temperature coefficients of the synchronous frequency of the two surface acoustic wave resonators have the same sign and the first-order temperature coefficients for the synchronous frequencies of the two surface acoustic wave resonators are equal to zero; and c) a ratio of an aperture of the of the first surface acoustic wave resonator to an aperture of the converter for the second surface acoustic wave resonator and a ratio of a number teeth of the converter of the first surface acoustic wave resonator to a number of teeth of the converter of the second surface acoustic wave resonator are selected so that variation in an oscillator frequency of the oscillator is a minimum in a given temperature range, and wherein: the surface wave resonators comprise a coupling converter as a coupling element and the coupling converters of the first surface wave resonator are connected with the coupling converters of the second surface wave resonator over two electrical connections; and the number of teeth of the coupling converters differ from one another and the apertures of the coupling converters are the same.