AC Coupled Comparator Reference Design, Input 2kHz to 32MHz
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Key Document


This TI Reference Design provides the theory, component selection, and simulation of a single supply comparator required to use AC coupling to detect sine waves or square waves. Often this is needed due to differences in ground between two different modules. Whenever AC coupling is involved into single supply circuitry negative voltages become a concern. Excessive negative voltages on comparators can cause the comparator to trip erroneously or to stay stuck at unpredictable levels. Proper high pass filtering and DC offsetting are required for reliable operation. This design will show how to AC couple a wide range of input signal levels and frequencies into a high speed comparator to generate a robust and accurate clock signal.

See more TI Precision Designs

  • AC Couples Pulses to eliminate Ground Potential Differences      
  • Comparator Outputs 0V to 5V      
  • Single-Supply Solution      
  • Input Frequency from 2kHz to 32MHz, 40% to 60% duty cycle
  • Utilizes TLV3501 for fast response time 
  • Utilizes Offset and Filter for reliable Single Supply Operation

 This Precision Reference Design Includes

  • Theory
  • Component Selection
  • TINA-TI Simulation
  • Modification Options

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Schematic/Block Diagram

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Test Data

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TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
TLV3501  4.5ns, Rail-to-Rail, High Speed Comparator with Shutdown  Amplifiers  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
TLV3501 Download Download
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 1417 21 Sep 2016
Design files (3)
Title Type Size (KB) Date
ZIP 1398 19 Sep 2013
PDF 186 06 Sep 2013
PDF 73 06 Sep 2013
Related Tools & Software

Design tools & simulation (1)

Name Part Number Tool Type
SPICE-based analog simulation program  TINA-TI  Simulation tool 

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