This example is taken from Chapt. 6.2.4 Tutorial #4 from the ASCO manual. S11 in the passband is to be maximised. S21 is used to extract side lobe parameters. The .net command is not available in ngspice, so S11 and S21 are derived with a script in file bandpass.sp as described in Chapt. 17.9. The measurements requested in bandpass.cfg as

# Measurements #

Left_Side_Lobe:---:LE:-20

Pass_Band_Ripple:---:GE:-1

Right_Side_Lobe:---:LE:-20

S11_In_Band:---:MAX:---

#

are realized as 'measure' commands inside of control sections (see files in directory extract). The result of a measure statement is a vector, which may be processed by commands in the following lines. In file extract/S1_In_Band #Symbol# is made available only after a short calculation (inversion of sign), using the print command. quit has been added to this entry because it will become the final control section in <computer-name>.sp. A disadvantage of measure inside of a .control section is that parameters from .param statements may not be used (as is done in example 23.5.4).

The bandpass example includes the calculation of RF parasitic elements defined in rfmodule.cfg (see Chapt. 7.5 of the ASCO manual). This calculation is invoked by setting

ExecuteRF:yes $Execute or no the RF module to add RF parasitics?

in bandpass.cfg. The two subcircuits LBOND_sub and CSMD_sub are generated in <computer-name>.sp to simulate these effects.