data:low-pass-pars d OUT args
| d | data object |
| OUT | The name of the output data column. Requires DB(OUT) and PH(OUT) columns. If these are not present, then RE(OUT) and IM(OUT) columns are used. If none of these are present, then error message is generated. |
| args | OPTIONS or RETURN-PARAMETERS. If no return-parameters are specified, all are returned. |
| -freq <FREQ> | specify the name of the frequency data column (default is FREQ). |
| -phase <phase> | specify the phase at DC. If this is not specified, then the phase of OUT at the first FREQ point is used to choose among -180, 0, or 180 (the closest value). |
| gain_dc | return the gain at lowest frequency point (dB) |
| phase_dc | return the phase at dc which was actually used |
| freq_gain0db | return the frequency at gain=0dB |
| phase_gain0db | return the phase at gain=0dB |
| freq_phase180 | return the frequency at phase=(phase_dc-180) |
| gain_phase180 | return the gain at phase=(phase_dc-180) |
| phase_margin | return the phase_gain0db-(phase_dc-180) |
| gain_margin | return the -gain_phase180 |
| bandwidth_3db | return the bandwidth at 3dB point |
| gbw_3db | return the gain-bandwidth product using 3dB point |
| gbw_dec | return the gain-bandwidth product at 1 decade below gain=0db point |
| Returns parameter value pairs: gain_dc gain at lowest frequency point (dB) phase_dc the phase at dc which was actually used freq_gain0db frequency at gain=0dB phase_gain0db phase at gain=0dB freq_phase180 frequency at phase=(phase_dc-180) gain_phase180 gain at phase=(phase_dc-180) phase_margin phase_gain0db-(phase_dc-180) gain_margin -gain_phase180 bandwidth_3db bandwidth at 3dB point gbw_3db gain-bandwidth product using 3dB point gbw_dec gain-bandwidth product at 1 decade below gain=0db pt |
data d
d read tgw32b.out
array set Pars [d low-pass-pars VOUT]
echo "3dB bandwidth = $Pars(bandwidth_3db)"
[data d] read tgw32b.out
echo "phase-margin = [d low-pass-pars VOUT phase_margin]"