Topic
Comparator applications
About: Comparator applications is a research topic. Over the lifetime, 2518 publications have been published within this topic receiving 26639 citations.
Papers published on a yearly basis
Papers
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01 Jun 1971
TL;DR: In this paper, a phase locked loop with a voltage controlled oscillator, a phase comparator and filtering means all of which are integrated into a single monolithic block is presented, where the collector load of the multivibrator is provided by the diode drops of the comparator transistors.
Abstract: Phase locked loop having a voltage controlled oscillator, a phase comparator and filtering means all of which are integrated into a single monolithic block The comparator is of The balanced bipolar analog multiplier type and is supplied a control voltage by a multivibrator of the voltage controlled oscillator The collector load of the multivibrator is provided by the diode drops of the comparator's transistors The multivibrator is driven by a differential current divider which in turn is provided current by a constant common current source
15 citations
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25 Jan 1993TL;DR: In this paper, a fully differential relaxation-type voltage controlled oscillator (VCO) includes an operational transconductance amplifier (OTA) for receiving a differential input voltage, and a comparator having hysteresis detects the charge on the capacitor.
Abstract: A fully-differential relaxation-type voltage controlled oscillator (VCO) (30) includes an operational transconductance amplifier (OTA) (31) for receiving a differential input voltage. The OTA (31) provides a charging current to a capacitor (33) proportional to the differential input voltage during a first phase of an output signal, and provides a discharging current to the capacitor (33) proportional to the differential input voltage during a secon d phase of the output signal. A comparator having hysteresis (34) detects the charge on the capacitor. A latching portion (35) latches the output of the comparator (34) to provide non-overlapping clock signals.
15 citations
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03 Oct 1996TL;DR: In this paper, a comparator has a simple high frequency signal path from input to output formed by two differentially connected transistors (Q1, Q2) with an output transistor (Q8, Q3) connected to each.
Abstract: A comparator has a simple high frequency signal path from input to output formed by two differentially connected transistors (Q1, Q2) with an output transistor (Q8, Q3) connected to each. A current control circuit maintains a constant total current flowing through the differentially connected transistors (Q1, Q2). The ratio of currents flowing through the differentially connected transistors (Q1, Q2) is initially set by a control circuit (I1, I2), so that the output of the comparator is predictable when powered up. The control circuit then gradually releases control, so that there is a smooth transfer to control by a reference signal input to the comparator.
15 citations
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07 Dec 1970
TL;DR: In this paper, a temperature stable integrated oscillator has a control loop including a flip-flop, a series resistor-capacitor timing circuit, reference voltage means and a comparator.
Abstract: A temperature stable integrated oscillator has a control loop including a flip-flop, a series resistor-capacitor timing circuit, reference voltage means and a comparator. The comparator compares the reference voltages to the voltage swing across the capacitor to actuate the flip-flop and thereby provide the oscillator output frequency. Temperature stability is provided by making both the voltage swing across the flip-flop and the reference voltage proportional to the difference between the power supply voltage and the base emitter drop of associated integrated transistors.
15 citations
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05 Aug 1996TL;DR: In this paper, a first phase comparator 22 of digital type and a second-phase comparator 32 of sampling type are provided, and a noise detecting/removing circuit 60 detects and removes noise from the reference signals fs, permits the reference signal fs to be fed to the first and second phase comparators 22 and 23, and halts the operations of the two phase-controllers 22 and 32 for only a predetermined period of time after the noise has been detected.
Abstract: A first phase comparator 22 of digital type and a second phase comparator 32 of sampling type are provided. Near a lock phase, an output current Iout2 is fed from the second phase comparator 32 to a voltage-controlled oscillator 14 through a change-over switch 40. In other phases, an output current Iout1 is fed thereto from the first phase comparator 22. When a reference signal fs is missing, a complementing circuit 50 complements a pulse to at least the reference signal fs input to the first phase comparator 22. A noise detecting/removing circuit 60 detects and removes noise from the reference signals fs, permits the reference signals fs to be fed to the first and second phase comparators 22 and 23, and halts the operations of the two phase comparators 22 and 32 for only a predetermined period of time after the noise has been detected. Therefore, the PLL circuit stably operates and characters are clearly displayed on a screen even when the noise is contained in the horizontal synchronizing signals of the video signals or even when the signals are missing.
15 citations