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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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Journal ArticleDOI
TL;DR: In this paper, a double-tail latched comparator with a self-neutralization technique has been proposed for biomedical applications with a power-delay product of 0.0172 fJ at 100 kHz clock frequency.
Abstract: This paper presents a new ultra-low power double-tail latched comparator suited for biomedical applications. The proposed comparator benefits from a positive feedback to achieve high resolution with low kickback noise. It is shown by time analysis and simulation that the delay time is significantly reduced compared to a conventional double-tail latched comparator. The presented circuit is designed and simulated in 0.18-μm CMOS technology. The post-layout simulation results show that the designed comparator consumes only 1.56 nW power, at 600 mV supply voltage and 100 kHz clock frequency. This amount is 54.35 % of power consumption of a conventional double-tail latched comparator with the same input referred offset of 7.5 mV. Furthermore, the proposed circuit provides a self-neutralization technique which results 8.8 % reduction of kick-back noise in comparison to the conventional latched comparator. The maximum clock frequency of this circuit is 200 MHz at 1 V supply voltage. The proposed circuit has a power-delay product of 0.0172 fJ at 100 kHz clock frequency. The proposed comparator is well designed to operate with supply voltages between 400 mV and 1 V.

19 citations

Journal ArticleDOI
TL;DR: Multilevel hysteresis comparators are discussed, including a new quasi-form, which incorporates standard hysteensis with error reference levels, for use in direct torque control schemes for induction motors.
Abstract: Multilevel hysteresis comparators are discussed, including a new quasi-form, which incorporates standard hysteresis with error reference levels, for use in direct torque control schemes for induction motors.

19 citations

Patent
28 Jan 1999
TL;DR: In this paper, a phase comparator is used to compare the reference signal with a feedback signal, which is then fed to a variable frequency divider circuit under control of a Σ/Δ converter to generate a lower frequency signal.
Abstract: A method and apparatus for generating two disparate frequency reference signals using a single phase locked loop. The circuit includes a local oscillator for generating a reference signal and a phase comparator for comparing the reference signal with a feedback signal. The output of the phase comparator is converted to a first one of the desired output frequencies by a voltage controlled oscillator. That signal is also fed to a variable frequency divider circuit under control of a Σ/Δ converter which generates a lower frequency signal without creating a secondary frequency tone. The lower frequency signal is the second of the output frequencies. This signal also is fed back to the second input of the phase comparator through a fixed frequency divider.

19 citations

Patent
18 Sep 1991
TL;DR: In this paper, a comparator with switching hysteresis is used for converting an analog sensor signal into a digital switching signal, and an apparatus is provided at the input side of the comparator in order to alternately supply each comparator inputs, as a function of the switching signal at the output side, symmetrically with a given hystresis signal as a switching threshold.
Abstract: A processing circuit for a magnetoresistive rotary speed sensor (13) or the like having a comparator (11) with switching hysteresis for converting an analog sensor signal into a digital switching signal. An apparatus is provided at the input side of the comparator in order to alternately supply each of the comparator inputs, as a function of the switching signal at the output side of the comparator, symmetrically with a given hysteresis signal as a switching threshold. This apparatus also includes a preamplifier (15) which precedes the comparator non-inverting input and which amplifies the sensor signal, and an offset amplifier (18) of the same construction which precedes the comparator inverting input and which amplifiers an offset signal of a preceding offset network (21). The processing circuit provides a simple, integrable circuit which suppresses offsets and compensates for temperature and supply voltage fluctuations and any spread in tolerances of the circuit components.

19 citations

Patent
Miura Tadahiko1, Takahashi1
31 Jan 1990
TL;DR: In this article, a power supply voltage monitoring circuit for use in a semiconductor circuit which is used with a plurality of power supply systems and is operable by switching the high and low power supply voltages, includes at least two power supply lines, a reference voltage source, a first comparator, a second comparator and a switching transistor disposed between the first and second comparators.
Abstract: A power supply voltage monitoring circuit for use in a semiconductor circuit which is used with a plurality of power supply systems and is operable by switching the high and low power supply voltages, includes at least two power supply lines, a reference voltage source, a first comparator, a second comparator and a switching transistor disposed between the first comparator and second comparator. The first comparator operates under a threshold value of a supply voltage which is an intermediate voltage between the high and low power supply voltages. The second comparator receives a voltage to be compared with a reference voltage supplied from the reference voltage source and the switching transistor changes, in response to an output from the first comparator, a voltage to be compared by the second comparator. An alarm signal indicating as to whether the supply voltage is normal or abnormal is obtained at an output of the second comparator.

19 citations


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