Oscillators – Beat frequency
Patent
1992-11-02
1994-05-03
Grimm, Siegfried H.
Oscillators
Beat frequency
331 41, 331 43, 331 60, 331116R, 331158, 331176, H03B 536, H03B 2101, H03B 2500
Patent
active
053091167
ABSTRACT:
A multimode oscillator is disclosed which employs a single gain loop for exciting at least two modes of a resonator to cause the oscillator to oscillate simultaneously at at least two frequencies. The multimode oscillator comprises the resonator, an amplifier to provide gain at the appropriate operating frequencies to support simultaneous oscillation at such frequencies and an equalizing network with amplitude and phase characteristics versus frequency to support the simultaneous modes of oscillation. The single loop oscillator permits separate control of the two simultaneous different frequencies of oscillation. In order to minimize thermal hysteresis, at least the active portion of the feedback loop does not include inductors. In some applications, the multimode oscillator may include one or more rejection networks to suppress unwanted oscillations. The useful outputs of the multimode oscillator are one or more of the operating frequencies, harmonics and intermodulation products. In one specific embodiment, one output is at the frequency of the fundamental C-mode resonance of an SC-cut lateral field quartz crystal, and a second output is at the beat frequency between the third harmonic of that fundamental and the third overtone. The beat frequency is a measurement of effects, such as temperature, upon the frequencies of operation of the oscillator.
REFERENCES:
patent: 3826931 (1974-07-01), Hammond
patent: 4079280 (1978-03-01), Kusters et al.
patent: 4468634 (1984-08-01), Takagi et al.
patent: 4740761 (1988-04-01), Barnes et al.
patent: 4748367 (1988-05-01), Bloch et al.
patent: 4839613 (1989-06-01), Echols et al.
Schodowski et al., "Resonator Self-Temperature-Sensing Using a Dual-Harmonic-Mode Crystal Oscillator", Pro. 43rd Ann. Symp. on Frequency Control, pp. 2-7, May 22-25, 1989.
Filler, Raymond L. Vig, John R., "Resonators for the Microcomputer Compensated Crystal Oscillator" Pro. 43rd Ann. Symp. on Frequency Control, pp. 8-15, May 22-25, 1989.
Bloch, Martin, Meirs, Marvin & Ho, John, "The Microcomputer Compensated Crystal Oscillator (MCXO)" Pro. 43rd Ann. Symp. on Frequency Control, pp. 16-19 May 22-25, 1989.
Benjaminson, A. & Stallings, S. C., "A Microcomputer-Compensated Crystal Oscillator Using A Dual-Mode Resonator" Pro. 43rd Ann. Symp. on Frequency Control, pp. 20-26, May 22-25, 1989.
Filler, R. L., Messina J. A. & Rosati, V. J., "Frequency-Temperature and Aging Performance of Microcomputer-Controlled Crystal Oscillators", Pro. 43rd Ann. Symp. on Frequency Control, pp. 27-33, May 22-25, 1989.
Bloch, Martin, Meirs, Marvin, Ho, John Vig. John R. & Schodowski, Stanley S., "Low Power Timekeeping", Pro. 43rd Ann. Symp. on Frequency Control, pp. 34-36 May 22-25, 1989.
Frequency Electronics, Inc.
Grimm Siegfried H.
LandOfFree
Multimode crystal oscillator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multimode crystal oscillator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multimode crystal oscillator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2117595