Comparator applications

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

Step-up continuous mode DC-to-DC converter with integrated fuzzy logic current control

Abstract: A step-up continuous-mode DC-to-DC converter with integrated current control, comprising a comparator for comparing a voltage signal output from the converter and a reference signal for generating an error signal and circuitry for generating a compensation ramp which generates a ramp signal which is added to a signal which is proportional to a current ramp that flows across the converter. The signal output from the comparator and the signal obtained from the sum are sent to an additional comparator, the output whereof, together with an oscillator signal, is used for driving a power transistor of the converter. A fuzzy logic control unit is interposed between the comparator and the additional comparator, the fuzzy logic control unit receiving at its input the error signal output by the comparator and emitting in an output signal which depends on the variation of the error signal over time to be sent to the additional

Communication system equipped with an AC coupling receiver circuit

Abstract: An AC coupling receiver circuit for use in a communication system comprises a comparator connected to transmission lines forming a twisted pair wire, through AC coupling capacitors, and a non-linear element connected between the transmission lines at a position close to the comparator with respect to the capacitors When positive and negative pulses are respectively applied to the transmission lines, the voltages of the transmission lines are respectively increased and decreased to bring the non-linear element to a substantially cut-off state, thus causing the comparator output to be inverted As the positive and negative pulses decay, the comparator output is again inverted, thus effectng signal transmission During the application of pulses, the charge stored in the capacitors is quickly discharged through the non-linear element, whereby fluctuation of the received threshold voltage resulting from the stored charge can be eliminated even if pulse inputs are continuous A high-reliability communication system can be realized by incorporating circuits which enable signal transmission even in the event of a short circuit or disconnection of the transmission lines

High-speed modified successive approximation analog to digital converter

Abstract: A high-speed algorithmic successive approximation analog to digital converter includes a system input terminal, and a tri-state comparator having an input terminal connected to the signal sampler. The comparator produces a first indication of a signal on its input terminal exceeds an upper reference voltage and the comparator produces a second indication if a signal on its input terminal exceeds the lower reference voltage, and does not exceed the upper reference voltage. A subtractor is connected to the system input terminal and to the comparator for subtracting from a received signal a first value corresponding to the upper reference voltage if the comparator produces the first indication, or a second value corresponding to the lower reference voltage if the comparator produces the second indication. The system additionally includes a multiplier having an input terminal connected to the output of the subtractor for doubling the output of the subtractor for further processing by the same or similar comparator assemblies. The comparator preferably includes first and second comparators, each for comparing the signal input with one of the upper and lower reference voltages, and logic connected to the output terminals of the comparators for producing the second indication only if the first indication is not produced.

Phase comparator circuit for high speed signals in delay locked loop circuit

Abstract: A phase comparator compares the phases of first and second signals with each other. The phase comparator has a first control circuit, a second control circuit, and a phase comparator unit. The first control circuit divides the frequency of the first signal by n in response to a third signal where n is an integer equal to or larger than 2. The second control circuit divides the frequency of the second signal by n in response to the third signal. The phase comparator unit compares the phases of signals provided by the first and second control circuits with each other. The phase comparator unit is capable of correctly comparing the phases of even high-speed signals with each other, and therefore, is applicable to a DLL circuit that operates on high-speed clock signals.

Differential chopper type comparator

Abstract: Differential chopper type comparator including a switching circuit which switches between a reference signal and an input signal according to a connected first period and second period, first and second comparator circuits, and a differential comparator circuit differentially comparing the outputs of the first and second comparator circuits. Each of the first and second comparator circuits comprises a capacitor, an inverter serially connected to the capacitor, and a switch that short-circuits the input/output terminal of the inverter during the first period. The first and second comparator circuits operate in tandem such that the reference signal is input to the firs comparator circuit during the first period when the inverter is short-circuited, while conversely the input signal is input to the second comparator circuit during the first period when its inverter is short-circuited, with the reverse occurring with respect to the first and second comparator circuits during the second period. A comparison as between the size of the input and reference signals is accomplished by the first comparator circuit, and a comparison as between the size of the reference and input signals is accomplished by the second comparator circuit. The outputs of the first and second comparator circuits are then provided to the differential comparator circuit which produces a resultant comparative output effectively free of noise even when the environment is of a high noise level.