# PSPICE SYNTAX & COMMAND SUMMARY

### R - Resistor

```General Format :

R|name| |+ node| |- node| {model name} |value|

The |+ node| and |- node| define the polarity of the resistor
in terms of the voltage drop across it.  Positive current flows from
the |+ node| thru the resistor and out the |- node|.

{model name} is optional and if not included then |value| is
the resistance in ohms.  If {model name} is specified  and TCE
is not specified then the resistance is given by :

Rtot = |value|*R*[1+TC1*(T-Tnom))+TC2*(T-Tnom)^2]

where R, TC1, and TC2 are described below.
Rtot is the total resistance, T is the simulation temperature and
Tnom is the nominal temperature (27C unless set by .OPTIONS TNOM command)

If TCE is specified then the resistance is given by :
Rtot = |value|*R*1.01^(TCE*(T-Tnom))

|value| can either be positive or negative.

Noise is calculated using a 1 Hz bandwidth.  The resistor generates
thermal noise with the following spectral power density (per unit BW) :
i^2 = 4*k*T/resistance
where k is Boltzmann's constant.

Model Parameters :
Name     Description
-------  -------------------------------------------------------
R        resistance multiplier
Default value = 1
TC1      linear temperature coefficient
Default value = 0 ; Units = ˇC^-1
TC2      quadratic temperature coefficient
Default value = 0 ; Units = ˇC^-2
TCE      exponential temperature coefficient
Default value = 0 ; Units = %/ˇC

Example :

R1 1 0 20
defines a 20 ohm resistor between nodes 1 and 0.
```

COMPONENTS
B C D E F G H I J K L M Q R S T V W X Sources

COMMANDS
* ; + .AC .DC .END .ENDS .FOUR .IC .INC .LIB .MC .MODEL .NODESET .NOISE
.OP .OPTIONS .PLOT .PRINT .PROBE .SENS .SUBCKT .TEMP .TF .TRAN .WIDTH