Oscillators – Automatic frequency stabilization using a phase or frequency... – With reference oscillator or source
Patent
1979-10-03
1981-11-24
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
With reference oscillator or source
310316, 318116, 331 64, 331154, 366116, H03B 538, H03L 708
Patent
active
043027288
ABSTRACT:
An oscillation system, having a vibrator, a resonant bridge and a low resistance, oscillates at desirable frequencies by receiving an excitation signal amplified to a predetermined value by an amplifier. A detection feedback signal containing the resonant frequency of the vibrator is input to a phase shift circuit. The phase shift circuit adjusts the phase of the detection feedback signal and the excitation signal to satisfy the oscillation condition. The output signal from the phase shift circuit is input to a PLL comprised of a phase comparator, a low pass filter, an amplifier and a voltage controlled oscillator. The frequency of the output signal from the PLL follows the resonant frequency of the vibrator and is locked. Its output signal is applied to the amplifier which feeds the oscillation system. An analog multiplier circuit is fed with signals proportional to the current and voltage from the resonant bridge circuit, and outputs the product of these signals. The output of the multiplier circuit is rectified and applied to a DC meter for indicating power consumption of the vibrator.
REFERENCES:
patent: 1745722 (1930-02-01), Simpson
patent: 3068411 (1962-12-01), Galman
patent: 4056761 (1977-11-01), Jacoby et al.
Grimm Siegfried H.
Ohtake Works Company, Ltd.
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