Oscillators – Solid state active element oscillator – Significant distributed parameter resonator
Patent
1988-06-24
1989-10-03
LaRoche, Eugene R.
Oscillators
Solid state active element oscillator
Significant distributed parameter resonator
331 76, 307522, H03B 512
Patent
active
048719846
ABSTRACT:
A microwave surface acoustic wave resonator stabilized oscillator includes an amplifier having an input terminal and an output terminal and a feedback circuit disposed around said amplifier for providing a closed loop about said amplifier having an integral multiple of 2.pi. radians of phase shift and excess small signal gain at a frequency f.sub.o. The SAW resonator is disposed in the feedback means and is selected to operate in a fundamental mode of operation and provides a resonant circuit having a resonant frequency f.sub.o. The feedback circuit around the amplifier causes the loop to oscillate at a frequency at which the phase shift is an integral multiple of 2.pi. radians and which has excess small signal gain. As the circuit starts to oscillate, the overall gain in the loop is compressed and the loop amplifier is forced to operate in a non-linear region. Operation in non-linear region causes the amplifier to generate harmonics of the fundamental frequency and thus, by providing a circuit which extracts the harmonics of the fundamental frequency, rather than the fundamental frequency itself, the frequency range of the amplifier can be extended. Furthermore, by keeping the fundamental frequency signal in the oscillator loop, the required gain of the loop amplifier may be decreased by up to 3 db and thus can potentially lower the noise floor of the oscillator by comparable figure.
REFERENCES:
patent: 4249146 (1981-02-01), Yen et al.
patent: 4433315 (1984-02-01), Vandegraaf
Dodson et al., Saw Stabilized Radiosondes, Conference: 1981 IEEE MTT-S Int. Microwave Symp. Digest, Los Angeles, CA. (Jun. 15-19, 1981), pp. 377-379.
Dodson et al., Injection Locked Saw Oscillators, Conference: 1980 Ultrasonics Symp. Proceedings, Boston, MA. (Nov. 5-7, 1980), pp. 268-271.
Chase, Jr. Charles E.
Laton Richard W.
Montress Gary K.
LaRoche Eugene R.
Maloney Denis G.
Pascal Robert J.
Raytheon Company
Sharkansky Richard M.
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