Topic
Comparator applications
About: Comparator applications is a research topic. Over the lifetime, 2518 publications have been published within this topic receiving 26639 citations.
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TL;DR: The results are compared with theoretical values derived in terms of the finite gain-bandwidth (GB) product and the slew rate of an op-amp and the response delay of a comparator to validate the theoretical derivation which gives the design criteria of a relaxation oscillator for capacitance measurements and sensor signal processing.
Abstract: Oscillation periods of a relaxation oscillator consisting of an op-amp-based integrator and a comparator are measured over a wide range of RC integration constants, and the results are compared with theoretical values derived in terms of the finite gain-bandwidth (GB) product and the slew rate of an op-amp and the response delay of a comparator The comparison validates the theoretical derivation which gives the design criteria of a relaxation oscillator for capacitance measurements and sensor signal processing
30 citations
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27 Dec 1988TL;DR: In this paper, a voltage comparator circuit with hysteresis characteristics is proposed, which includes a resistor element connected between the reference potential terminal and the comparison reference voltage input terminal, a first constant current source for supplying current into the comparison voltage terminal and a second constant current Source for deriving current out of the comparison Reference Voltage input terminal.
Abstract: A voltage comparator circuit with hysteresis characteristics includes a voltage comparator circuit for comparing an input signal voltage with a comparison reference voltage and outputting a comparison result, a resistor element connected between the reference potential terminal and the comparison reference voltage input terminal of the voltage comparator circuit, a first constant current source for supplying current into the comparison reference voltage terminal and a second constant current source for deriving current out of the comparison reference voltage input terminal, and a control circuit for selectively activating one of the first and second current sources, in accordance with the logic level of an output of the voltage comparator circuit.
30 citations
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19 Aug 1980TL;DR: In this paper, the average temperature of the cabinet air is measured using a thermistor and a potentiometer, and a second comparator is interposed between the first comparator and the second comparators to provide high noise immunity.
Abstract: A refrigerator includes a compressor, a condenser, an evaporator, an evaporator fan and a temperature sensing circuit which includes a thermistor located to sense the average temperature of the cabinet air and a potentiometer manually adjustable to a desired temperature set point. The temperature sensing circuit also includes a first comparator stage which indicates whether the average temperature of the cabinet air is above or below a first value, the first comparator having little or no hysteresis in its response so that small changes in temperature can be detected. A second comparator stage indicates whether a signal at its input is greater or less than a second value, the second comparator stage having substantial hysteresis in its response to provide high noise immunity. An integrator is interposed between the first comparator stage and the second comparator stage to further enhance noise suppression.
30 citations
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08 Sep 1982TL;DR: In this paper, a phase-locked loop circuit is proposed to obtain a signal synchronized with a phase of an input signal, including a synchronizing portion, and a data portion having a voltage controlled oscillator, a frequency phase comparator, and an output of the phase comparators.
Abstract: A phase-locked loop circuit, which obtains a signal synchronized with a phase of an input signal, including a synchronizing portion, and a data portion having a voltage controlled oscillator, a frequency phase comparator, a phase comparator, and a control circuit. The frequency phase comparator detects the phase difference and the frequency difference between the input signal and the output of the voltage controlled oscillator and the phase comparator detects the phase difference between the input signal and the output of the voltage controlled oscillator. The control circuit controls the voltage controlled oscillator, at least during a portion of the synchronizing signal portion, in accordance with the output of the frequency phase comparator, and, during the data signal portion, in accordance with the output of the phase comparator.
30 citations