I'm working on a pulse generation circuit that will be used to drive an ultrasonic transducer. The following circuit is giving an unexpected output.
It might look complicated, but really it can be divided up into smaller parts. Also, despite the wierd names for the GNDs, they are all 0/CAPSYMs. The P-type MOSFET is the pspice model SiHFU9214 provided by Vishay.
The Vpulse does have a 40ns PW parameter, but that is simply due to the delays of the rest of the gates.
Of course, the problems always arise when trying to combine different subcircuits. The probed node (1st pic) should be reading around 220V, instead I simply get this sloped line when running the simulation for 3750us.
I'm wondering if the 60Hz frequency of the DC source, and my pulse frequency of 800Hz might be causing the 10nF capacitor to not charge correctly.