LB-6: Fast Voltage Comparators with Low Input
Current - Application Note. . . [National Semiconductor]
Light Sensor With Hysteresis - It is quite a simple circuit but rather more effective than the one using the 741. It uses a
simple comparator LM311 as the master piece. This comparator is powered from a +12V DC supply and does not
require negative supply to work efficiently. The feedback given to the comparator provides some hysteresis and
the potentiometer allows to adjust the sensitivity of the detector for darkness. I am quite sure you could
inverse R1 and R2 positions to inverse the action of the detector but I haven't tried it!. . . . [by Frank
Rivard]
LM139/LM239/LM339 a Quad of Independently
Functioning Comparators - Application Note 24-Feb-1999. .
. [National Semiconductor]
Low Power Comparator with <10uV Hysteresis - The opamp is used as a precision comparator that drives an NPN transistor to form a
logic-level output. Controlled positive feedback into a trim pin makes precision microvolt hysteresis control
practical. . . . [Linear Technology App Note - , Jun 21st 2011]
Low Voltage Alarm - NE555 Low Voltage Battery Disconnect Circuit. . . [Design by Aaron Cake]
Microvolt Compararator with TTL Output - Amplifiers can easily be used as comparators although somewhat slower than dedicated
circuits. Very accurate comparison threshold is provided by the low offset of the Amplifier. Feedback to one of
the offset adjust pins adds hysteresis to prevent oscillations when the inputs are close to each other. . . .
[Linear Technology App Note - , Jun 21, 2011]
MicroVolt Comparator - App Note - first published 28-Jun-1996 . . . [National Semiconductor]
Microvolt Comparator with Hysteresis - Very low offset, 20uV typical, can produce extremely accurate comparator functions. Small
input voltages can produce oscillations without hysteresis. Here hysteresis is added to a Vos trim pin to as to
not degrade the input precision. . . . [Linear Technology App Note - , Jun 21, 2011]
Missing Pulse Detector Basic - This circuit is a one-shot that is continually retriggered by incoming pulses. . . . [Tony
van Roon's circuit]
Missing-codes tester checks 16-bit ADC in 7 sec - 06/10/99 EDN Design Idea As the resolution of ADCs increases from 12 to 16 bits and
higher, the difficulty in testing the"nomissing-codes"specification grows proportionately. To fully guarantee no
missing codes for a 16-bit ADC requires testing all 2 16-. . . [by Mark A Shill, Burr-Brown Corp, Tucson, AZ]
One-Shot Provides Frequency Discrimination - 05/01/03 EDN Design Idea You use a frequency discriminator to compare one signal
frequency with another one. A functional feature, retriggering, of a monostable, one-shot 74xx123 multivibrator
can yield frequency discrimination. Figure 1 shows a frequency discriminator that determines the relation of
input-pulse frequency to a reference frequency. . . [by Victor Aksenenka, CSRI Elektropribor, St Petersburg,
Russia]
Pilot Light Flame Detector with Low-Battery
Lockout using a Type R Thermocouple - The LTC1541 combine
a micropower Amplifier, comparator and bandgap reference in an 8-pin package. The part operates from a single 2.
5V to 12. 6V or dual ±1. 25V to ±6. 3V supply with a typical supply current of 5µA. Both the op Amp and
comparator feature a common mode input voltage range that extends from the negative supply . . . [Linear
Technology App Note - , Apr 8th 2010]
Precision AC Peak Detector - This unique circuit uses a very inexpensive voltage comparator to form a peak detector. The
DC voltage produced tracks the positive peak of the input signal. It works from about ten millivolts to about 10
volts peak to peak. The maximum frequency is about . . . [Circuit by Dave Johnson P.E., 02/11/02]
Precision IC Comparator Runs from Plus 5 Volt
Logic Supply - Application Note 04-Nov-1995. . .
[National Semiconductor]
Pulse Generator Has 0ns to 10ns Width, 520ps
Transitions - It is sometimes desirable to produce
extremely short width pulses in response to an input trigger. Such a predictable, programmable short time
interval generator has broad use in fast pulse circuitry, particularly in sampling applications. This circuit,
built around a quad high speed comparator and a fast gate, has a settable . . . [Linear Technology App Note - , Mar
25th 2010] |