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9.3.8 .TF: Transfer Function Analysis

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.