My new approach

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does anyone know what the pulse width for a square wave generator set to "pulse" in the circuit simulator is? 20%?

edit: i guess it's 25% or 90° or pi/2.

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If your talking about the input/output square wave simply right click on it and you can change all of its varibles... Voltage/pulse rate etc etc...

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I also could not find the pulse duty cycle settings. But you can use duty cycle in the square wave, only you must make a offset.
Example:  Vpp= 10V, Vmax=10V, Vmin=0V, DU=10%
Settings: Select waveform "Square Wave", Max Volt=5, Freq=100Hz, DC offset(V)=5, Duty cycle=10%

br,
webmug

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Pulse is: Square Wave Generator then there is a dropdown box where you can choose "Pulse", this eliminates the negative parts of the square wave but the duty cycle cannot be changed.

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on the circuit simulator from this site
http://www.ionizationx.com/circuit/index.html
i get these option in the square wave gen
MAX VOLT
WAVEFORM
FREQUENCY
DC OFFSET VOLT
PHASE OFFSET
DUTY CYCLE

Might be a better option for your circuit then the pulses.

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Yes the waveform can be pulse, but then the duty cycle is not adjustable anymore. The positive thing is that you do not need a diode after the generator because there is only positive voltage.

see images