Patent
Monolithic integrated circuit for an rc oscillator
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TLDR
In this paper, a monolithic integrated circuit for an RC oscillator includes a differential amplifier acting as a switching stage for comparing a threshold voltage corresponding to the maximum oscillator voltage with the capacitor voltage of the RC circuit.Abstract:
A monolithic integrated circuit for an RC oscillator includes a differential amplifier acting as a switching stage for comparing a threshold voltage corresponding to the maximum oscillator voltage with the capacitor voltage of the RC circuit. An output of the differential amplifier is connected to the S input of an R-S flip-flop which is set when the capacitor voltage reaches the threshold voltage. A switching transistor has its collector and emitter connected across the capacitor and a base connected to the output of the R-S flip-flop for discharging the capacitor when the flip-flop is set. A second transistor has its base-emitter junction connected across the base-collector junction of the switching transistors so that when the switching transistor has discharged the capacitor to a point that only its collector-to-emitter saturation voltage dropped across it, the second transistor is turned on to provide a signal to the reset input of the flip-flop, thereby inhibiting the discharge of the capacitor and allowing the capacitor to recharge through a current source.read more
Citations
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Patent
Wide frequency range current-controlled oscillator
TL;DR: In this paper, a CCO includes a differential voltage comparator coupled to a timing capacitor for controlling charging and discharging currents applied to the timing capacitor, depending on the input control current.
References
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Patent
Electronic switching circuit
TL;DR: In this paper, a monolithic integrated sawtooth oscillator includes an electronic switching circuit for controlling the charging and discharging of a capacitor through a pair of current sources, one of which is used to charge the capacitor and the second of which operates to remove charge from the capacitor when the switching circuit is rendered operative.