Pulse Stretcher - V2

Update: kicad files: 2014-07-23-pulse_stretcher_kicad

A development on pulse stretcher V1.

This circuit is used to stretch a short 10 ns pulse from a photon-counting module to a 100ns long pulse that can be more easily recorded or time-stamped e.g. with the white rabbit fine-delay FMC.

pulse_stretch_schematic_2014-06-30

The new circuit is the same LT1711-based design as the old one, with an added buffer (BUF602) on the output. This improves output-load handling because the BUF602 can drive both 50 Ohm and 1 MOhm loads.

The PCB is made to fit a BNC-BNC enclosure by Pomona.

pulse_stretch_2014-06-30

pulse_stretcher_assembled

Some testing with an artificial input-pulse from a Keithley 3390 signal-generator..

pulse_stretcher_test_keithley3390

.. and with the actual PMT-pulse. Note how the 100MHz scope produces nice round smooth signals while the 500 MHz Tektronix reveals more of the ugly truth.

pulse_stretcher_test_PMT

2 thoughts on “Pulse Stretcher - V2”

  1. Thanks, good job with kicad,
    Cans I ask you to send me this kicad project , I try to do the same thing with LTC6752
    Thanks you very much.

  2. I have update the post with a link to a zip file with the kicad project, schematic, and PCB. hope this helps.

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