1us Pulse Generator

Discussion in 'The Projects Forum' started by sunny304, May 30, 2014.

  1. sunny304

    Thread Starter New Member

    May 30, 2014
    Hi guys,
    I am trying to build a Pulse Generator which generates a 1us pulse (no variation in the length of the pulse) but the frequency should be variable between 0.2 and 20kHz and the voltage output is ought to be between 0V and 30V on a 50 Ohm load impedance.
    The difficulty I have atm is that the Rise/Fall Time should be 5ns. Unfortunately I will not be able to use a 555 Timer because the Jitter is too high on those ICs.
    I came across two different possibilities of creating such a circuit. The first one is using a Shock Line Pulse Generator but this seems to mostly apply to high voltage applications. Secondly it would be possible to use Differential Amplifiers but these seem to have a "slow" slew rate for my application.
    Any ideas on what method I should apply?
    Thanks for your input
  2. MrChips


    Oct 2, 2009
    You can use a 555 CMOS timer circuit (LMC555 or TLC555) to generate the variable frequency.

    Then use a 74LS123, 74HC123 or 74HCT123 monostable multivibrator to generate the 1μs pulse width.
    sunny304 likes this.
  3. sunny304

    Thread Starter New Member

    May 30, 2014
    Will this method be able to generate a 5ns rise/fall time?
  4. ronv

    AAC Fanatic!

    Nov 12, 2008