Comparator applications

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

High-precision and high-speed analog/digital converter having low power consumption

Abstract: This invention discloses an analog/digital converter including comparator groups in which each comparator is constituted by bipolar transistors, for comparing reference voltages with an analog input voltage, and means for obtaining a digital converted value corresponding to the analog input voltage, in accordance with comparison results of in the comparator groups.

&Dgr -&Sgr modulator and &Dgr -&Sgr A/D converter

Abstract: A Δ-Σ converter comprises a Δ-Σ modulator and a digital filter. The Δ-Σ modulator has a comparator having two resonant tunnel diodes connected to each other in series between two terminals and a field effect transistor connected in parallel to one of the resonant tunnel diodes, a conversion input transistor for converting an input voltage into electric current, a capacitor provided so that charge amount thereof is decreased by flow of electric current through the conversion input transistor and an electric potential proportional to the charge amount is used for the input electric potential to the comparator, and a feedback transistor, to which an output of the comparator is inputted, operating in such a way as to increase the charge amount of the capacitance element when the output of the comparator becomes a high level.

Insulation resistance detecting apparatus

Abstract: There is provided an insulation resistance detecting apparatus that accurately calculates an insulation resistance value in real time. The insulation resistance detecting apparatus includes: pulse generator 10 , comparator 11 to which reference voltage V REF is supplied as one input and an output from pulse generator 10 is supplied as the other input, comparator 11 that outputs a low-level signal when the level of the other input exceeds reference voltage V REF , and that outputs a high-level signal when the level of the other input is lower than reference voltage V REF ; resistance R 1 provided on the output line of pulse generator 10 in series; coupling capacitor C 2 one end of which is connected to the other input line of comparator 11 and the other end of which is connected to the output line of high-voltage DC power supply 21 ; capacitor C 1 one end of which is connected to the other input line of comparator 11 and the other end of which is connected to a ground; and pulse width measuring device 12 that calculates the value of insulation resistance on the output line of high-voltage DC power supply 21 from the duty ratio of an output waveform of comparator 11.

Quickly variable frequency generator

Abstract: 1. A quickly variable frequency generator of the fractional division type, comprising a phase comparator (1), a first input (E1) of which is coupled to the comparison signal (Fr) input (E) of the generator, and having a second input (E2), a variable oscillator (5) having a control input which is coupled to the comparator, and an output which constitutes the generator output, and comprising a variable-module divider (7-8-9) which is inserted between the oscillator and the second input (E2) of the phase comparator (1), characterized in that the frequency generator comprises in series between the comparator (1) and the control input of the oscillator (5) a window circuit (2) which truncates the duration of each output signal of the comparator (1) by a given value T which depends on the maximum duration (d phi) of the phase shift due to the fractional division in the operational frequency bandwidth of the generator, in such a way that the phase jitter due to the fractional division does not impair the spectrum of the generator output signal.

NMOS analog voltage comparator

Abstract: An NMOS analog voltage comparator is disclosed having two matching cascaded inverter-pairs. The comparator has fast response time, is not sensitive to temperature variations while operating, and operates independent of integrated circuit parameter variations encountered during circuit manufacture.