Oscillators – Solid state active element oscillator – Significant distributed parameter resonator
Reexamination Certificate
2007-06-07
2010-12-07
Mis, David (Department: 2817)
Oscillators
Solid state active element oscillator
Significant distributed parameter resonator
C331S176000
Reexamination Certificate
active
07847647
ABSTRACT:
An oscillator circuit includes a combination of two frequency-determining elements, designed as single-port surface wave resonators with interdigital converters, and one active electronic circuit. The two single-port surface wave resonators are connected to each other, avoiding inductive components. In the case of a combination in a parallel circuit, the connection is designed as a combination oscillating at high-frequency anti-resonance, and in the case of a combination in a series circuit, the combination is designed as a combination oscillating at high-frequency resonance. A ratio of apertures of the interdigital converters to one another, a ratio of their number of prongs to one another, and the thickness of the electrode layer of the single-port surface wave resonators as well as the propagation direction for acoustic surface waves of the single-port surface wave resonators are selected so that the temperature-dependent change of the phase of the combination and the temperature-dependent change of the total phase of the rest of the elements of the oscillator circuit have signs opposite to one another and that the sum of these phase changes in a thermal operating range of the oscillator circuit is smaller than a value of the phase change of the combination and smaller than a value of the phase change of the rest of the elements of the oscillator circuit.
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Martin Guenter
Wall Bert
Jordan and Hamburg LLP
Mis David
Vectron International GmbH & Co. KG
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