Coupled resonator phase shift oscillator
First Claim
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1. A coupled resonator phase shift oscillator comprising:
- a. an amplifier having an input and an output and a predetermined phase shift between said input and output,b. a surface acoustic wave coupled resonator having;
i. an input and an output,ii. a frequency response curve passing through 3 dB points; and
iii. a phase shift occurring between the 3 dB points which, when added to said amplifier phase shift, causes oscillation, andc. means for connecting the output of said amplifier as an input to said coupled resonator and the output of said coupled resonator as the input of said amplifier to form an inductorless phase shift oscillator.
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Abstract
A phase shift oscillator formed with a surface acoustic wave coupled resonator in series with an amplifier and wherein the coupled resonator has a substantially 180° phase shift occurring between the 3dB points of the frequency response curve of the coupled resonator.
13 Citations
11 Claims
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1. A coupled resonator phase shift oscillator comprising:
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a. an amplifier having an input and an output and a predetermined phase shift between said input and output, b. a surface acoustic wave coupled resonator having; i. an input and an output, ii. a frequency response curve passing through 3 dB points; and iii. a phase shift occurring between the 3 dB points which, when added to said amplifier phase shift, causes oscillation, and c. means for connecting the output of said amplifier as an input to said coupled resonator and the output of said coupled resonator as the input of said amplifier to form an inductorless phase shift oscillator. - View Dependent Claims (2, 3, 4, 5)
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6. A method of forming a coupled resonator phase shift oscillator comprising the steps of:
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a. forming an amplifier having an input and an output and a predetermined phase shift between said input and output, b. forming a surface acoustic wave coupled resonator having i. an input and an output, ii. a frequency response curve passing through the 3 dB points, and iii. a phase shift occurring substantially between the 3 dB points and which, when added to said amplifier phase shift, causes oscillations, and c. connecting the output of said amplifier to the input of said coupled resonator and the output of said coupled resonator to the input of said amplifier so as to form an inductorless phase shift oscillator. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification