Here you can download some schematics to test with Qucs. (Qucs schematic files are plain text files!) All users of Qucs are invited to contribute to these examples. If you want to share a schematic or circuit model do not hesitate to do so.

Simulation examples

DC simulation bridge.sch two-dimensional DC sweep
  Mirrors_prj.tar.gz collection of current mirror schematics using mos and bipolar
  charac.sch output characteristics of a bipolar transistor
  diff1.sch large-signal characteristic of a differential amplifier
  fgummel.sch forward gummel characteristic of a bipolar transistor
  rgummel.sch reverse gummel characteristic of a bipolar transistor
  preregulator.sch simple series pre-regulator circuit
AC simulation swr_meter.sch circuit of an SWR meter
  gyrator.sch a primitive gyrator circuit
  resonance.sch shows voltage overshot of series resonance circuit
  stab.sch simulates stability of feedback circuit
  active_bp.sch a simple bandpass filter with OpAmp
  active_lp.sch active 6th order Chebyshev low-pass filter
  bbv.sch a BJT broadband amplifier circuit
  singleOPV.sch subcircuit of an small, internally compensated MOS OpAmp
  gain.sch simple example for "singleOPV.sch" (needs the circuit above to be run)
  notch.sch a 50Hz notch filter realized with OpAmp gyrator
  selective_amp.sch classic selective RF amplifier
  Amp4.zip audio amplifier provided by John H. Ludwig
  MillerAmp_prj.zip general purpose amplifier provided by John H. Ludwig
  bjt_noise.zip simple flicker noise simulation for a BJT provided by Antonio
  1838MHz_PLL_prj.tar.gz 1838MHz PLL modelling including noise provided by M.J. Head
  groupdelay_ac.sch group delay of a Butterworth filter using AC simulation
  qucs-radiometer-model.tgz radiometer model provided by Andrea Zonca
Transient simulation mixer.sch a double-balanced mixer
  lf_osci.sch an oscillator for low-frequencies
  rf_osci.sch a Peltz oscillator
  colpitts.sch a colpitts oscillator with JFET
  classic_osci.sch a classic oscillator design
  multiplier.sch a charge-pumped voltage multiplier
  active_mixer.sch an active, single-balanced mixer
  gilbert.sch a gilbert cell mixer
  sym_osci.sch a symmetrical MOSFET oscillator
  schmitt.sch a schmitt trigger circuit
  colpitts_base.sch a colpitts oscillator in common-base circuit
  supply.sch a conventional power supply
  chargepump.sch a charge-pump circuit doubling the voltage
  lc_osc.sch a symmetrical LC CMOS oscillator
  single_balanced.sch single-balanced CMOS mixer
  Puls3b.sch fast transient pulse generation
  sawtooth-1.sch sawtooth generator using simple thyristor, thanks to Oswald
  sawtooth-2.sch sawtooth generator using opamp integrator, thanks to Oswald
  sawtooth-3.sch sawtooth generator using flip-flop
  sawtooth-discreet.sch sawtooth generator using thyristor, thanks to Oswald
  time_resistor.sch time-dependent variable resistor
  vfile_test_tran.tar.gz test of file-based voltage source
  fullwaverectifier_1.sch full-wave rectifier using a transformer and 2 diodes
  fullwaverectifier_2.sch Gratz bridge rectifier: a full-wave rectifier using 4 diodes
  buckconverter.sch buck converter (step-down DC-DC converter) circuit
  boostconverter.sch boost converter (step-up DC-DC converter) circuit
  buckboost.sch inverting buck/boost converter circuit
S-parameter simulation elliptic_5th.sch a 5th order low pass elliptic filter
  chebyshev1_5th.sch a 5th order low pass Chebyshev type 1 filter
  fhr01fh.sch small-signal model of a Fujitsu HEMT (including noise analysis)
  giacoletto.sch modified Giacoletto equivalent circuit
  fet.sch small-signal model of a high gain FET (subcircuit)
  fet_noise.sch noise matching of the FET in fet.sch
  microstrip.sch simple examples how to use microstrip components
  bpf_10Ghz.sch a microstrip band pass filter created by Toyoyuki Ishikawa
  opamp_gyrator.sch gyrator with operational amplifier
  wilkinson.sch an ideal Wilkinson divider
  2StageAmplifier_prj.tar.gz building a two-stage RF amplifier with stabilization, noise and power matching
  groupdelay_sp.sch group delay of a Butterworth filter using S-parameter simulation
  SmithChartTest.sch Smith chart example test with a band pass filter
Digital simulation DigitalAdder_prj.tar.gz four-bit adder using one-bit halfadders and fulladders
  flip_flops_models_tran_prj.zip collection of flip-flop models usable for digital as well as transient simulation
  BCD_prj.tar.gz four-bit synchronous BCD counter
Harmonic balance diode_hb.sch very simple diode setup for demonstration purposes only

 

Simulation models

 

Macro and circuit models LM317_prj.tar.gz LM317 voltage regulator(s) using different SPICE models
  555_examples_prj.tar.gz famous 555 timer macromodel and examples
  IdealBalun.sch ideal balun model
  LPF-Balun2.sch low-pass filter using ideal balun
  LPF-Balun3.sch another low-pass filter using ideal balun
Device models curtice1_MESFET_prj.tar.gz Curtice level 1 MESFET model
  shot.sch universal shot noise subcircuit
  flicker.sch flicker noise subcircuit
  triode.sch triode tube model
  pentode.sch pentode tube model
Complete projects RADAR2010_prj.zip project on radar circuits (attenuators, duplexers, limiters, phase shifters)
and subsystems (T/R modules and reflect arrays) for a tutorial
given at the 2010 IEEE Radar Conference

 QUCS example page 

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