Inexpensive peak detector requires few components


Posted on Aug 29, 2012

Requiring no rectifier diodes, the positive peak-detector circuits in figures 1 and 2 exploit the open-drain output of a Texas Instruments TLC372 fast comparator, IC1. Both versions of the detector are simple and inexpensive and provide a buffered, low-impedance output at VOUT. In addition, the TLC372`s high typical input impedance of 1012 eliminates any need for an input buffer stage. As Figure 1 shows, the detector`s output voltage at the output of op amp IC2A applies a feedback signal for the comparator and acts as a reference level for comparison with the input signal`s amplitude. Upon first application of input signal VIN, the voltage on the hold capacitor, C1, is 0V, and VOUT is also 0V.






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