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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.


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Patent
Heinz Zitta1
26 Sep 1988
TL;DR: In this paper, the offset voltage is impressed by the design of the transistors in complementary MOS technology, and a circuit arrangement is proposed to generate an impressed offset voltage for a differential comparator, where the geometries (W/L) of the input differential transistors (M1, M2, M11, M12) are designed symmetrically and the associated load transistors are designed asymmetrically.
Abstract: To generate an impressed offset voltage for a differential comparator, a circuit arrangement in complementary MOS technology is proposed in which the offset voltage is impressed by the design of the transistors. For this purpose, the geometries (W/L) of the input differential transistors (M1, M2; M11, M12) are designed symmetrically and geometries (W/L) of the associated load transistors (M3, M4; M13, M14) are designed asymmetrically, and the geometries (W/L) of the transistors of the output driver circuit (M6 to M9; M16, M17) are matched to the operating characteristic thus generated in the differential comparator.

21 citations

Patent
07 Jun 1990
TL;DR: In this paper, an integrated semiconductor circuit for thermal measurements, consisting of at least a temperature or a heat current sensor and a signal comparator, is presented, with the comparator being provided with a signal feed-back loop containing a DA signal converter.
Abstract: Integrated semiconductor circuit for thermal measurements, com­prising at least a temperature or a heat current sensor and a signal comparator (8), the comparator (8) being provided with a signal feed­back loop containing a DA signal converter (3), more specifically, the comparator (8) being a temperature or a heat current comparator, the DA signal-converter (3) comprising a power output and the signal feedback loop comprising components for the transfer of thermal signals.

21 citations

Patent
Lloyd P. Matthews1
19 Dec 1988
TL;DR: In this article, the phase comparator is coupled with a filter with multiple bandwidths, a voltage controlled oscillator and a frequency divider to complete the phase-locked loop and the control circuit is implemented with circuitry which accurately detects either condition and is capable of blocking any premature change of bandwidth.
Abstract: A phase locked loop has a digital phase comparator, a filter with multiple bandwidths, a voltage controlled oscillator and a frequency divider connected to the phase comparator to complete the loop. Control circuitry is coupled to both the phase comparator and filter for controlling switching between a wide bandwidth and a narrow bandwidth. The switching in bandwidth is in response to either detecting when the output signal is within a predetermined range of the reference frequency for a predetermined time period or detecting when the output signal exceeds and falls below the reference frequency a predetermined number of times. The control circuit is implemented with circuitry which accurately detects either condition and is capable of blocking any premature change of bandwidth.

21 citations

Patent
27 Sep 1991
TL;DR: In this article, the gate of a P-channel transistor of a first comparator is supplied with an input signal, and the second comparator outputs a voltage equal to a stand-by time output voltage of the first comparators, which is then sent to the non-inversion input terminal of a third comparator which is connected to a voltage generating circuit.
Abstract: The gate of a first P-channel transistor of a first comparator is supplied with an input signal, and the gate of a second P-channel transistor of the first comparator is supplied with a reference voltage. An output terminal of the first comparator is connected to an output circuit and the gates of first and second P-channel transistors of a second comparator are supplied with the reference voltage. The second comparator outputs a voltage equal to a stand-by time output voltage of the first comparator and the output voltage from the second comparator is supplied to the non-inversion input terminal of a third comparator which is connected to a voltage generating circuit. The voltage generating circuit has substantially the same dimension ratio as the output circuit and generates a voltage equal to the threshold voltage of the output circuit. A third comparator controls the first P-channel transistors of the first and second comparators in accordance with a difference voltage between the output voltage of the second comparator and the output voltage of the voltage generating circuit to thereby automatically set a stand-by time output voltage of the first comparator at a value close to the threshold of the output circuit.

21 citations

Patent
04 Nov 1992
TL;DR: In this article, a comparator includes a P-channel MOS transistor connected at the source thereof to a power source and at the drain thereof to the comparator output and the drain of an N-channel mOS transistor.
Abstract: A comparator includes a P-channel MOS transistor connected at the source thereof to a power source and at the drain thereof to a comparator output and the drain of an N-channel MOS transistor. The source of the N-channel MOS transistor is connected to the ground. The gates of the P-channel MOS transistor and the N-channel MOS transistor are connected to a comparator input. The logic threshold voltage of the comparator is adjusted in accordance with a circuit parameter regarding the P-channel MOS transistor and the N-channel MOS transistor such as, a gate length, a gate width or a voltage of the power source. A result of comparison by the comparator between an analog input value inputted to the comparator input and the logic threshold voltage of the comparator is outputted to the comparator output. An analog to digital converter is constructed using the comparator. The analog to digital converter is reduced in size and allows high speed analog to digital conversion.

21 citations


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