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Voltage Source, Piecewise Linear, MSINC and ASPEC Compatible (Netlist Only)

Voltage Source, Piecewise Linear, MSINC and ASPEC Compatible (Netlist Only)

Piecewise Linear Voltage Source Netlist Form

Note

The MSINC- and ASPEC-compatible syntax for the piecewise linear current source is available for use in netlists, but is not supported in the Components window of the Designer Schematic Editor. It is provided to support third-party netlists.

The MSINC and ASPEC compatible netlist format for a piecewise linear current source is:

Vxxxx n+ n- PL [(]v1 t1 [v2 t2... vN tN]

[R[=repeattime]] [TD=delay][)]

n+ and n- are the positive and negative nodes. The parentheses around the parameters after the PL keyword are optional. The first value-time pair (v1 t1) is required, while subsequent pairs are optional.

**Piecewise Linear Voltage Source Parameters**
Parameter	Description	Unit	Default
t1 ... tN	Timepoints	Second	0.0
v1 ... vN	Voltage values at corresponding timepoints	Volt	0.0
R	Repeat the segment of the waveform that begins at repeattime and ends at timeN. Repeattime must be less than timeN. If R is entered with no repeattime, repeats from 0.0 seconds to timeN.	Second	None
TD	Time delay to start of first PWL waveform, and to start of first repeat	Second	0.0

MSINC and ASPEC Compatible PWL Voltage Source Netlist Example

Vpl 23 53 PL (0 0 0.5 10ns 1.5 15ns 0 20ns R TD=3e-12)

Notes

1. The time points t1 ... tN must be given in STRICTLY INCREASING order. Two points may not refer to the same time.

2. The time delay specified by TD=delay is applied to the start of the PL waveform, so that the wave starts at (time1 + delay).

3. The repeat specified by R=repeattime repeats the portion of the PL waveform that lies between repeattime and timeN. The repeattime must be greater than or equal to 0.0 seconds, and less than timeN. The repeat begins at tN, subject to any delay. The delay is applied to the repeattime as well as to the PL waveform, so that the repeating segment is the portion of the PL waveform between (repeattime + delay) and (timeN + delay). The repeating wave starts at the PL value that occurred at repeattime in the original wave, interpolated if necessary.

4. The transition from the PL value vN at time tN to the (possibly interpolated) value at the start of the repeat can create a discontinuity in the output, especially if the transition is “instantaneous,” that is, occurring with no time difference between the two values. Care should be taken to avoid such a discontinuity, or to ensure that it is very small if it cannot be avoided. Discontinuous current or voltage jumps larger than a minimum value can create a timestep problem for transient analysis.

5. Here is an example using eight time points plus a time delay, with a repeat time (R) that occurs between timepoints, so that interpolation is required.

V2 1 0 PL(

+ 1.0e-3 0.0 $ v1 t1

+ 2.0e-3 1.0e-3 $ v2 t2

+ 1.6e-3 2.6e-3 $ v3 t3

+ 2.7e-3 3.3e-3 $ v4 t4

+ 1.6e-3 4.1e-3 $ v5 t5

+ 1.6e-3 4.7e-3 $ v6 t6

+ 1.0e-3 5.2e-3 $ v7 t7

+ 0.4e-3 5.3e-3 $ v8 t8

+ ) R=0.4e-3 TD=1.0e-3

Note the use of timepoint t8 to avoid an “instantaneous” jump in output where the repeat begins. If t8 were omitted, the output would change from the level at t7 to the (interpolated) value at the start of the repeat with no time difference between the two values. Such a sudden discontinuity can cause a timestep-too-small failure in transient analysis. The diagram below illustrates this example, showing one repeat:

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