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LTC6752 Pulse Stretcher Circuit/Monostable Multivibrator

Figure 12

For detecting short pulses from a single sensor, a pulse stretcher is often required. The circuit of the figure above acts as a one-shot, stretching the width of an incoming pulse to a consistent ~100ns. The circuit works as follows: Comparator U1 functions as a threshold detector, and Comparator U2 functions as a one-shot. Comparator U1 is biased with a threshold of 11mV to overcome comparator and system offsets, and establish a low output in the absence of an input signal. An input pulse causes the output of U1 to go high, which then causes the output of U2 to go high. The output of U2 is fed back to the input of the 1st comparator, Timing Capacitor C now begins charging through R. After 100ns, U2 goes low, allowing U1 also to go low. A new pulse at the input of U2 can now restart the process. Timing capacitor C can be increased without limit for longer output pulses.

 


Software

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

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