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Comparator applications

About: Comparator applications is a research topic. Over the lifetime, 2518 publications have been published within this topic receiving 26639 citations.


Papers
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Patent
20 Sep 1971
TL;DR: In this article, a comparator having two output states and two input connections is used to develop an indication of the polarity of an alternating voltage, which is coupled with one of two inputs of the comparator.
Abstract: A comparator having two output states and two input connections is used to develop an indication of the polarity of an alternating voltage. The comparator output is coupled with one of two inputs of the comparator. Two voltage controlled switches including opposite conductivity type transistors and oppositely poled diodes are connected such that the voltage being sensed is applied to the second input to the comparator when it changes polarity, thereby changing the state of the comparator output. Control of the switches in accordance with the comparator output and the sensed voltage provides a disconnect feature whereby the detector draws power from the sensed voltage only during switching intervals; no power is drawn after a change in polarity by the sensed voltage until it again reverses its polarity.

16 citations

Patent
21 May 1990
TL;DR: In this article, a self-oscillating power supply circuit comprises a series arrangement of the primary winding of a transformer, the main current path of a first semiconductor switch and a current measuring resistor.
Abstract: A self-oscillating power supply circuit comprises a series arrangement of the primary winding (N 1 ) of a transformer (TR), the main current path of a first semiconductor switch (T 1 ) and a current measuring resistor (R 1 ). The first semiconductor switch is driven by a second semiconductor switch (T 2 ) which in turn is controlled by a comparator (CP). The voltage across the current measuring resistor is applied to the non-inverting input (6) of the comparator and, a reference voltage obtained from a reference voltage source (RS) is applied to the comparator inverting input (5). By arranging a capacitor (C 2 ) between the output of the second semiconductor switch and the inverting input (5) of the comparator, the first semiconductor switch rapidly turns-off at the end of the forward phase at an accurately determined current through the primary winding. By applying a lower reference voltage to the comparator at a higher mains voltage, an output current is obtained from the transformer secondary winding (N 2 ) for the load L, which is substantially independent of the mains voltage.

16 citations

Patent
03 Nov 1997
TL;DR: In this paper, an improved thermal asperity detector using a variable time threshold was presented, which includes a polarity latch, a processor, a level comparator, and a timing comparator.
Abstract: An improved thermal asperity detector is disclosed for detecting short thermal asperities using a variable time threshold. The thermal asperity detector includes a saturation detector, and a comparator system. The comparator system may include a polarity latch, a processor, a level comparator and a timing comparator. The saturation detector compares a programmable saturation threshold to an A/D sample to generate an enable signal in response to the A/D sample exceeding the saturation threshold. The polarity latch receives the A/D sample and the enable signal, and records the most significant bit of the A/D sample to identify the polarity of the saturation and to provide an output signal representative thereof in response to the enable signal. The processor generates a threshold level control signal based upon a programmable level threshold and the polarity latch output signal. The level comparator compares the A/D sample and the output from the polarity latch in response to the enable signal, and generates a timing output signal to a timing comparator in response to the comparison of the A/D sample and the output from the polarity latch. The timing output signal represents a number of succeeding A/D samples that surpasses the dynamically shifted level threshold. The timing comparator compares the timing output signal from the level comparator and a programmable time threshold in response to the enable signal. Finally, the timing comparator generates a thermal asperity indication when the succeeding A/D samples surpass the dynamically shifted level threshold for the programmable time threshold.

16 citations

Patent
Isamu Shibata1, Yoshiaki Kanmoto1
08 Feb 1985
TL;DR: In this article, an up/down counter is controlled an output signal from the comparator to supply the semiconductor laser with a current proportional to a count output from the up and down counter.
Abstract: A device detects the radiating output from a semiconductor laser and compares a detected signal with a reference signal in a comparator. An up/down counter is controlled an output signal from the comparator to supply the semiconductor laser with a current proportional to a count output from the up/down counter. The current supplied to the semiconductor laser is controlled and held so as to equalize the input signals to the comparator at all times.

16 citations

Patent
Yamaguchi Motoi1
07 Sep 1995
TL;DR: In this article, a chopper type comparator is described and implemented with a differential configuration with inverter amplifiers each having a control terminal, which successfully cancels noise of the same phase while preventing a current from constantly flowing therethrough.
Abstract: A chopper type comparator is disclosed and implements a differential configuration with inverter amplifiers each having a control terminal. The comparator, therefore, successfully cancels noise of the same phase while preventing a current from constantly flowing therethrough. The cancellation of noise of the same phase, coupled with differential signals, doubles the signal range in the same voltage range, compared to a single end configuration. Hence, a high resolution is achievable even when a power source voltage is low.

16 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202319
202269
20185
201747
201687
2015100