Fail-safe square-wave oscillator
First Claim
1. A vital oscillating circuit comprising, an operational amplifier having an inverting and a noninverting input terminal and an output terminal, a voltage dividing network for providing a reference voltage at one-half the voltage of a voltage supply source to said inverting input terminal, a resonant circuit for determining the frequency of oscillation coupled between said inverting and noninverting input terminals, a starting capacitor for providing a pulse of current when the voltage source is initially applied to start oscillation, and a feedback circuit coupled between said output terminal and said noninverting input terminal for sustaining oscillation.
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Accused Products
Abstract
A vital integrated circuit square-wave oscillator having an integrated circuit operational amplifier. A reference voltage dividing resistor network connected to an inverting input of the amplifier for providing a 50--50 duty cycle. An L-C tank circuit connected between the inverting input and a noninverting input for determining the frequency of oscillation. A starting capacitor for initiating the oscillating action and a regenerative feedback circuit for sustaining the oscillations.
23 Citations
10 Claims
- 1. A vital oscillating circuit comprising, an operational amplifier having an inverting and a noninverting input terminal and an output terminal, a voltage dividing network for providing a reference voltage at one-half the voltage of a voltage supply source to said inverting input terminal, a resonant circuit for determining the frequency of oscillation coupled between said inverting and noninverting input terminals, a starting capacitor for providing a pulse of current when the voltage source is initially applied to start oscillation, and a feedback circuit coupled between said output terminal and said noninverting input terminal for sustaining oscillation.
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10. A fail-safe electronic square-wave oscillator in which the frequency of oscillation is unable to decrease appreciably during a component or circuit failure comprising, an integrated circuit operational amplifier having an inverting and noninverting input terminal and an output terminal, a voltage divider having a pair of series-connected resistors connected between a positive voltage supply source and ground, the junction point of said series-connected resistors connected to said inverting input terminal to provide a reference voltage which is at one-half the voltage of the positive voltage supply source, a parallel L-C resonant circuit connected between said inverting and non-inverting input terminal for determining the frequency of oscillation and for providing a 50--50 duty cycle, a starting capacitor connected between the positive voltage supply source and said inverting input terminal to provide a pulse of current when the positive voltage supply source is initially applied to initiate the oscillating action, and a regenerative feedback circuit having a current-limiting resistor connected between said output terminal and said noninverting input terminal for sustaining the oscillations.
Specification