Oscillators – With parasitic oscillation control or prevention means
Patent
1995-12-21
1998-01-27
Grimm, Siegfried H.
Oscillators
With parasitic oscillation control or prevention means
331158, H03B 532
Patent
active
057125988
ABSTRACT:
A driving circuit and a Self-oscillating circuit incorporating a piezoelectric oscillator having one terminal connected to ground. In the driving circuit, an alternating driving power is supplied to a first terminal of the piezoelectric oscillator, and the second terminal of the piezoelectric oscillator is connected to ground. The damping capacitance of the piezoelectric oscillator is effectively canceled by connecting the first terminal to an input of an amplifier, and forming a feedback loop by connecting an output of the amplifier to the input through a electrostatic capacitance whose value is 1/N times the damping capacitance of the piezoelectric oscillator, where the amplifier has a gain of (N+1). In the self-oscillating circuit, a frequency selection circuit is provided which includes a positive feedback circuit connected between an output and a non-inverting input of an amplifier, and an electrostatic converter including a first terminal connected to the positive feedback circuit, and a second terminal connected to ground. The positive feedback circuit includes an electrostatic capacitance and a resistor selected such that a self-oscillation frequency of the self-oscillation circuit is determined by said frequency selection circuit.
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Bever Patrick T.
Grimm Siegfried H.
Shoup Guy W.
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