Next: TRAN Transient Analysis, Previous: SENS; DC or Small-Signal AC Sensitivity Analysis, Up: Analyses
General form:
.TF OUTVAR INSRC
Examples:
.TF V(5, 3) VIN .TF I(VLOAD) VIN
The TF line defines the small-signal output and input for the dc small-signal analysis. OUTVAR is the smallsignal output variable and INSRC is the small-signal input source. If this line is included, NGSPICE computes the dc small-signal value of the transfer function (output/input), input resistance, and output resistance. For the first example, NGSPICE would compute the ratio of V(5, 3) to VIN, the small-signal input resistance at VIN, and the smallsignal output resistance measured across nodes 5 and 3.