how to change negative pulse to positive pulse?

Thread Starter

radetonator

Joined Aug 1, 2011
50
For the pulser circuit shown below, the output pulse is negetive. If BNC need to be connected to the load, how can output pulse be positive?:confused:
 

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SgtWookie

Joined Jul 17, 2007
22,210
What in the world are you working on that outputs a 1nS -1kV pulse?

I hope you realize that a 1nS pulse will require a circuit with a bandwidth >= 10GHz in order to make a reasonable facsimile of the pulse, but inverted, right? That's in the radar X-band RF spectrum. At those frequencies, a tiny kink in a wire acts like an inductor. It's even difficult to use multilayer ceramic caps due to their parasitic inductance.

In the beginning of your thread, you posted a waveform that's practically identical to the one in this thread:
http://forum.allaboutcircuits.com/showthread.php?t=59546
and the OP is wanting to invert the signal, stretch the pulse, and detect it using a microcontroller.
 

Thread Starter

radetonator

Joined Aug 1, 2011
50
The pulser i am working on is not the one as shown in the beginning of the thread. But the structure of the output stage is the same-- a capacitor and a load resistor. The current flows from GND to the load. So that pulse is negative.
 
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