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Comparator Circuits

Comparators:  #B        C       D - K       L - S       T - Z

 

Last Updated: November 30, 2017 07:38 AM

Circuits Designed by Dave Johnson, P.E.

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.-February, 2002


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

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 mater piece.   This comparator is powered from a +12V DC supply and does not require negative supply to work efficiently. __ Designed by Frank Rivard

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/Analog Devices App Note, Jun 21st 2011

Low Voltage Alarm NE555 Low Voltage Battery Disconnect Circuit __ Designed by Aaron Cake

Method Calculates Comparator Trip Points 06/10/99 EDN-Design Ideas Using Millman's Theorem to calculate the resistor ratio reduces the time it takes to calculate the trip points on a comparator with hysteresis.  This method eliminates lengthy computations and substitutions.  Using this resistor ratio, you select two resistors, assign convenient values, and then calculate the third value__ Circuit Design by Virgil Lawrence, Micro Linear, San Jose, CA

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/Analog Devices App Note, Jun 21, 2011

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/Analog Devices App Note, Jun 21, 2011

Missing-codes tester checks 16-bit ADC in 7 sec 06/10/99 EDN-Design Ideas 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 16-1 possible output__ Circuit Design by Mark A Shill, Burr-Brown Corp, Tucson, AZ

Multiple Relay Drive Circuit Ideas for Designers App Note___ Advanced Linear Devices, Inc

New Comparators Feature Micropower Operation Under All Conditions DN137 Design Notes___ Linear Technology/Analog Devices

Op Amp Comparator & Reference IC Provides Micropower Monitoring Capability Design Note 190 DN190 Design Notes___ Linear Technology/Analog Devices

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/Analog Devices App Note, Apr 8th 2010

PLL implements FPGA-based SDRAM controller EDN-Design Ideas March 26, 1998    [ NOTE : File has multiple design, scroll for this one.]  As FPGA capabilities increase and time to market decreases, FPGAs gain more acceptance for implementing both data and control paths. Thus, they find wide use as controllers and datapath glue logic for fast-page DRAMs.__ Circuit Design by Eddy Debaere, Barco Graphics, Ghent, Belgium

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.-February, 2002

Precision Ramp Generator & Comparator Circuit Ideas for Designers App Note___ Advanced Linear Devices, Inc

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/Analog Devices App Note, Mar 25th 2010

Push-Pull Complementary Power MOSFET Driver Circuit Ideas for Designers App Note___ Advanced Linear Devices, Inc

Quad Comparator Regulates Temperature 10/26/95 EDN-Design Ideas Using a negative-temperature-coefficient thermistor, the circuit in Fig 1a controls temperature within 1°C or better with a minimum of components, cost, and complexity.  The circuit includes protection against a short or open temperature sensor.  You can purchase all of the key components, except the actual heating element, at the local Radio Shack.__ Circuit Design by H Randall Moore, Lake Forest, CA

Rail-to-Rail Voltage Comparator-23007.0 Circuit Ideas for Designers App Note___ Advanced Linear Devices, Inc

Rail-to-Rail Voltage Comparator-23008.0 Circuit Ideas for Designers App Note___ Advanced Linear Devices, Inc

Rail-to-Rail Window Comparator-23008.0 Circuit Ideas for Designers App Note___ Advanced Linear Devices, Inc

Reset Supervisor Waits for Stable Supply 17-Apr-03 EDN-Design Ideas Get more power with a boosted triodeThe power-up cycle of the supply voltage in embedded-system applications is sometimes not a clean event.  This fact holds especially true in battery-operated systems, because the insertion of a battery often causes significant ringing or glitching on the supply line(Figure 1).  In products with on-off switches, the contact bounce of the switch can cause an unclean power-up__ Circuit Design by Mike Mitchell, Texas Instruments, Dallas, TX

SC Schmitt Comparator Head A simple little Design by Martin Keen and Wilf Rigter __ Designed by Wilf Rigter

Schottky Diodes Improve Comparator’s Transient Response 21-Jan-10 EDN-Design Ideas Two Schottky barrier diodes clamp error voltages, cut output glitches__ Circuit Design by Marián Stofka, Slovak University of Technology, Bratislava, Slovakia

Seven Nanosecond Comparator for Single Supply Operation AN72 AN72 is an extensive discussion of the causes and cures of problems in very high speed comparator circuits.  A separate applications section uses the 7ns LT1394 in V-to-F converters, crystal oscillators, clock skew generators, triggers, sampling configurations and a nanosecond pulse stretcher.  Appendices cover related topics. __ Linear Technology/Analog Devices

Synchronized Window Comparator Eliminates Error 05/11/95 EDN-Design Ideas Precision A/D converters need a window comparator.  The window comparator in Fig 1a is synchronized to the clock signal.  This synchronization eliminates errors that could arise when the input signal crosses the high or low threshold(Fig 1b]unsynchronized to clock.  In operation, comparator IC1A sets flip-flop IC2__ Circuit Design by Sergey Velichko, Consultant, Bosie, ID


Comparators:  #B        C       D - K       L - S       T - Z


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