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RC band pass example circuit
* This netlist demonstrates the following:
* global nodes (vdd, gnd)
* .measure statements for delay and an example ternary operator
* You can run the example circuit with this command:
*
* ngspice rc-meas-ac.sp
* global nodes
.global vdd gnd
* autostop -- stop simulation early if .measure statements done
*.option autostop
vin in gnd dc 0 ac 1
R1 in mid1 1k
c1 mid1 gnd 1n
C2 mid1 out 500p
R2 out gnd 1k
.control
ac DEC 10 1k 10MEG
meas ac vout_at FIND v(out) AT=1MEG
meas ac vout_atr FIND vr(out) AT=1MEG
meas ac vout_ati FIND vi(out) AT=1MEG
meas ac vout_atm FIND vm(out) AT=1MEG
meas ac vout_atp FIND vp(out) AT=1MEG
meas ac vout_atd FIND vdb(out) AT=1MEG
meas ac vout_max max v(out) from=1k to=10MEG
meas ac freq_at when v(out)=0.1
meas ac vout_diff trig v(out) val=0.1 rise=1 targ v(out) val=0.1 fall=1
meas ac fixed_diff trig AT = 10k targ v(out) val=0.1 rise=1
meas ac vout_avg avg v(out) from=10k to=1MEG
meas ac vout_integ integ v(out) from=20k to=500k
meas ac freq_at2 when v(out)=0.1 fall=LAST
*meas ac bw_chk param='(vout_diff < 100k) ? 1 : 0'
if (vout_diff < 100k)
let bw_chk = 1
else
let bw_chk = 0
end
echo bw_chk = "$&bw_chk"
*meas ac bw_chk2 param='(vout_diff > 500k) ? 1 : 0'
if (vout_diff > 500k)
let bw_chk2 = 1
else
let bw_chk2 = 0
end
echo bw_chk2 = "$&bw_chk2"
meas ac vout_rms rms v(out) from=10 to=1G
*rusage all
plot v(out)
plot ph(v(out))
plot mag(v(out))
plot db(v(out))
.endc
.end
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