Vector allocation @ Spice Opus

What do you mean by "size"?

Have you considered using a "PULSE" source model?

Size? Well, at the moment the size (or order) of the vector pwl is 12 and I want to have a order of, let=B4s say 100.

The reason why I am using the pwl instead of of the pulse is, that I want to make a PWM signal. The problem is, that I want to change the Pulse Duty after every period. The signal should run for about 100 periods

In PSpice...

General form PWL

• [TIME_SCALE_FACTOR=]
• [VALUE_SCALE_FACTOR=]
• (corner_points)* where corner_points are: (, ) to specify a point FILE to read point values from a file REPEAT FOR (corner_points)* ENDREPEATto repeat times REPEAT FOREVER (corner_points)* ENDREPEATto repeat forever Examples v1 1 2 PWL (0,1) (1.2,5) (1.4,2) (2,4) (3,1) v2 3 4 PWL REPEAT FOR 5 (1,0) (2,1) (3,0) ENDREPEAT v3 5,6 PWL REPEAT FOR 5 FILE DATA1.TAB
• ENDREPEAT v4 7 8 PWL TIME_SCALE_FACTOR=0.1
• REPEAT FOREVER
• REPEAT FOR 5 (1,0) (2,1) (3,0) ENDREPEAT
• REPEAT FOR 5 FILE DATA1.TAB
• ENDREPEAT
• ENDREPEAT n volt square wave (where n is 1, 2, 3, 4, then 5); 75% duty cycle; 10 cycles; 1 microseconds per cycle: .PARAM N=1 .STEP PARAM N 1,5,1 V1 1 0 PWL
• TIME_SCALE_FACTOR=1e-6 ;all time units are scaled to
• microseconds
• REPEAT FOR 10
• (.25, 0)(.26, {N})(.99, {N})(1, 0)
• ENDREPEAT

...Jim Thompson

Ah. I see. Well, if it were me, I might write a short program in BASIC to accept a few defining characteristics and output a suitably formatted pwl line, then cut and paste it into the model.

Neat. What's the format of the data file?

time voltage pairs

...Jim Thompson

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

Thank you for the quick reply. I gotta tell you how i solved it.

... Mathias Doering