Values and expressions

Values can be entered in as standard, scientific, or quasi-SI notation. They can also be entered as expressions using parameters.

Static values

Static values are usually entered as numbers without SI units (for example, 12m instead of 12mV ). Where an SI unit is required, it is derived from the context. For example, if a current source is being configured, the system knows that the value specifies ampere.

Three notations for static values are available:

• Standard numeric notation

  For example: 0.03, 2, 1234, 16777216

• Scientific notation

  For example: 3e-2, 2e0, 1.234e3, 1.6777216e7

• Spice (quasi-SI) notation

  For example: 30m, 2, 1.234k, 16.777216meg

  The letters supported in this notation are not case-sensitive:

  a	atto	10-18
  f	femto	10-15
  p	pico	10-12
  n	nano	10-9
  u	micro	10-6
  m	milli	10-3
  k	kilo	103
  meg	mega	106
  g	giga	109
  t	tera	1012

SI units are usually not included (for example, 12m instead of 12mV ). Where an SI unit is required, it is derived from the context. For example, if a current source is being configured, the system knows that the value specifies ampere.

The decimal point is a period in all notations; thousands separators are not supported.

Expressions

To create values that can be changed by centrally modifying parameters, you can use expressions. Expressions can contain numeric operators (such as + - * / ^), logic operators (such as = <= >) functions, and parameters that have been defined in the Parameters tab of the Simulation Environment view. For example, if you define a parameter "baseRate", you can specify a value as 2*baseRate+1. If baseRate is set to 5 for a simulation, this expression will result in a value of 11 in the simulation. Details about supported operators and functions can be found in the Parameters and Arithmetic Expressions section of the Titan reference manual.

Expressions are evaluated before each simulation run. Certain advanced kinds of expressions can also be evaluated during a simulation, as described in the Types of Expressions section of the Titan reference manual.