piecewise linear: how? tina

Jack Palczynski

Intellectual 1080 points

Other Parts Discussed in Thread: TINA-TI

I am attempting to build the following signal:

Start at t=0, V=0.944

at t=3.23usec, V=1.2V (ramped up)

at t=3.24usec, V=0

repeating at 5usec intervals.

I'm trying this with the piecewise linear model, which I'm getting nowhere with. I'll add that I have not used pspice in 20 years, so I would expect the help section to explain how to add commands. If another model could be used instead, please point me in that direction.

This work is to help the largest customer in New England.

jack

over 14 years ago

0 Britt Brooks - Online Design Tools over 14 years ago

TI__Mastermind 41310 points

Jack,

There is a way to make the signal in the piecewise linear source periodic. IT requires the use of keywords REPEAT FOREVER and ENDREPEAT. For your signal, i would use the following:

REPEAT FOREVER
0 0.944
3.23u 1.2
3.24u 0
4.99u 0
5u 0.944
ENDREPEAT

The waveform initially starts at 0.944, gradually goes up to 1.2V at 3.32u and then drops to 0 at 3.24u. At 4.99u, the signal will need to get back to 0.944, so I put in a rise time of 0.01u from 0 to 0.944.

Let me know if this solves your problem in TINA-TI.

Britt