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# Comparator Circuits/Schematics

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 Absolute Value Circuit Delivers High Bandwidth - 05/15/03 EDN-Design Ideas: Most absolute-value circuits have limited bandwidth and high component count, and y require several matched resistors. The circuit in Figure 1 uses three fewer components than most absolute-value circuits require, and only two of  resistors must have 1% tolerance to obtain 1% accuracy. This circuit's output voltage is an accurate representation....  When you connect remote sensors to a central process controller, a simple, robust, and commonly used interface is the 4to 20-mA loop. The advantages of this current loop include the simplicity of just two twisted wires that share both power and signal, the loop's high noise immunity in harsh environments Absolute Value Comparator Touts Accuracy Size - 03/07/02 EDN-Design Ideas: A typical window comparator uses two comparators and a single op amp to determine where a voltage is inside or outside a boundary region. Figure 1 shows a typical implementation. IC1 is an inverting op amp with a gain of –1. VREF and –VREF create  window limits. When VIN becomes more positive than VREF,  output of IC2A goes low Acceptable Voltage Indictor - I have used this circuit many times in custom test fixtures where a simple go-no go indication was needed.  The circuit can also be used to adjust a particular voltage be within specific high or low limits.  The three LEDs will indicate if the voltage is high, low or OK.  When connected to other converters, such as a frequency to voltage converter, a current to voltage converter or a power to voltage meter, it could provide a quick indication of a proper level. ….(designed by David A. Johnson) An IC Voltage Comparator for High Impedance Circuitry - National Semiconductor Application Note AN-25: Applying the OP06 Op Amp as a High Precision Comparator - AN-25 Analog Devices Application Notes AN-345: Grounding for Low-and-High-Frequency Circuits - AN-345 Analog Devices Application Notes. Know Your Ground and Signal Paths for Effective Designs. Current Flow Seeks Path of Least Impedance-Not Just Resistance.... AN-348: Avoiding Passive-Component Pitfalls - AN-348 Analog Devices Application Notes. The Wrong Passive Component Can Derail Even  Best Op Amp or Data Converter. Here Are Some Basic Traps to Watch For. AN-349: Keys to Longer Life for CMOS - AN-349 Analog Devices Application Notes . Here's How CMOS Can be Protected Against Abuse AN-352: High Speed Comparators Provide Many Useful Circuit Functions When Used Correctly - AN-352 Analog Devices Application Notes AN-41: Precision IC Comparator Runs from +5V Logic Supply - National Semiconductor Application Note AN700: Make a Delta-Sigma Converter using a MicroController's Analog Comparator Module - Microchip Application Note Published 20-Jan-99 AN-769: Generating Multiple Clock Outputs from the AD9540 - AN-769 Analog Devices Application Notes AN-772: A Design & Manufacturing Guide for the Lead Frame Chip Scale Package - AN-772 Analog Devices Application Notes AN-87: Comparing the High Speed Comparators - National Semiconductor Application Note Analog Comparison, Digital Result - Comparators are very useful for comparing two analog voltages and providing a digital result. In this case, if the light source is dim, a red LED is enabled. If the light source is bright, a green LED is enabled. However, once comparators are understood, they can be useful for driving small robots or helping a microcontroller. Applications of the LM392 Comparator Opamp Ic - National Semiconductor Application Note 04-Nov-1995 Applying the OP06 Op Amp as a High Precision Comparator - AN-25 Analog Devices Application Notes Avoiding Passive-Component Pitfalls - AN-348 Analog Devices Application Notes. The Wrong Passive Component Can Derail Even  Best Op Amp or Data Converter. Here Are Some Basic Traps to Watch For.