.TEMP Record

The TEMP record is used to change the assumed temperature in the circuit. If a TEMP record is not included, all calculations assume a temperature of 298.16 degrees K (25 degrees C). The TEMP record contains one parameter:

.temp F1

where F1 is the circuit temperature in degrees C.

The temperature is used in calculating the noise from resistors according to the Johnson noise formula:

$En=\sqrt{4.0*k*T*B*R}$

where k is Boltzman's constant (1.38e-23), T is the resistor temperature in degrees K, B is the noise bandwidth in Hertz, and R is the resistance in ohms.

The temperature is not used in the calculation of noise from operational amplifiers or transistors. The noise spectral densities set in the model descriptions are used at all temperatures.

Examples:

.TEMP * sets temperature to 0.0 C.

.TEMP -55. * sets temperature to -55.0 C.