Qucs. Test Report. SPICE to Qucs conversion: Test File 2. Mike Brinson. Copyright c 2007 Mike Brinson

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1 Qucs Test Report SPICE to Qucs conversion: Test File 2 Mike Brinson Copyright c 27 Mike Brinson <mbrin7243@yahoo.co.uk> Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version. or any later version published by the Free Software Foundation. A copy of the license is included in the section entitled GNU Free Documentation License.

2 Introduction Title DC and independent voltage sin generator test. SPICE specification Format: VX N+ N- [[DC] DC/TRAN VALUE] [AC [ACMAG [ACPHASE] ] ] Notes:. Characters [ and ] enclose optional items 2. Character / denotes OR 3. Independent voltage source names begin with the letter V 4. X denotes name of source. N+ and N- are the positive and negative nodes respectively 6. Voltage sources need not be grounded Specification of SPICE statement being tested: VX N+ N- [[DC] VALUE] [SIN(VO VA [ FREQ [ TD [ KD ] ] ] ] Notes:. SIN generates a periodic sinusoidal signal, where 2. VO is the DC offset; default: must be specified 3. VA is the signal amplitude; default: must be specified 4. FREQ is the signal frequency; default: value = /TSTOP. TD is initial delay before sinusoidal signal starts; default: value = seconds 6. KD is the damping coefficient; default: value =. The damping factor has dimension /.

3 Test code and schematic SPICE code: File S2Q_test2.cir SPICE to Qucs syntax t e s t f i l e 2 DC and independent v o l t a g e s i n sources, plus r e s i s t o r s.. subckt S2Q t e s t 2 p p2 p3 p4 p p6 p7 p8 p9 p p v p v r p k v2 p2 dc v r2 p2 k v3 p3 s i n ( ) r3 p3 k v4 p4 s i n ( k ) r4 p4 k v p s i n ( k. m) r p k v6 p6 s i n ( k. m ) r6 p6 k v7 p7 s i n ( k. m ) r7 p7 k v8 p8 dc v s i n ( k. m ) r8 p8 k v9 p9 s i n ( k. m ) r9 p9 k v p s i n ( k. m ) r p k v p dc s i n ( k. m ) r p k. ends. end 2

4 2 2 vp.vt vp2.vt vp3.vt e e e vp4.vt vp.vt vp6.vt - e e e vp7.vt vp8.vt vp9.vt - - e e e vp.vt vp.vt - e e Figure : March : SPICE to Qucs conversion: Test2 waveforms 3

5 History of simulation results March 27, Simulation tests by Mike Brinson. Test : Vp.Vt; Pass correct result. 2. Test 2 : Vp2.Vt; Pass correct result. 3. Test 3 : Vp3.Vt; Fail ERROR: line 7: checker error, no such variable nan used in a Vac:V3 property NOTE error occurs when v3 uncommented. 4. Test 4 : Vp4.Vt; Pass. Test : Vp.Vt; Fail TD should be.m seconds - otherwise OK. 6. Test 6 : Vp6.Vt; Fail TD should be.m seconds - otherwise OK. 7. Test 7 : Vp7.Vt; Fail TD should be.m seconds - otherwise OK. 8. Test 8 : Vp8.Vt; Fail TD should be.m seconds - otherwise OK 9. Test 9 : Vp9.Vt; Fail TD should be.m seconds - otherwise OK. Test : Vp.Vt; Fail TD should be.m seconds - otherwise OK. Test : Vp.Vt; Fail TD should be.m seconds, plus DC level wrong. March 2 27, Simulation tests by Mike Brinson Code modifications:. * check_spice.cpp: Fixed DC offset of sinuasoidal voltage and current sources. Also apply default frequency if a transient analysis is given. Stefan Jahn 2. * vac.cpp, iac.cpp: Adjusted dependency of damping factor Stefan Jahn. Test : Vp.Vt; Pass correct result. 2. Test 2 : Vp2.Vt; Pass correct result. 3. Test 3 : Vp3.Vt; Pass - see note below. 4. Test 4 : Vp4.Vt; Pass.. Test : Vp.Vt; Pass - see note 2 below. 4

6 # Qucs.. /media/hda2/s2q t e s t 2 p r j /S2Q( t e s t 2 ). sch. Def : S2Q t e s t 2 net net net2 net3 net4 net net6 net7 net8 net9 net Sub : X net net net2 net3 net4 net net6 net7 net8 net9 net gnd Type= S2Q t e s t 2 c i r. Def : S2Q t e s t 2 c i r netp netp2 netp3 netp4 netp netp6 netp7 netp8 netp9 netp netp r e f. Def : S2Q TEST2 r e f netp netp2 netp3 netp4 netp netp6 netp7 netp8 netp9 netp netp Vac : V netp cnet8 U= f= k Phase= 8 Theta= Vac : V netp cnet7 U= f= k Phase= 8 Theta= Vac : V9 netp9 cnet6 U= f= k Phase= 8 Theta= Vac : V8 netp8 cnet U= f= k Phase= 8 Theta= Vac : V7 netp7 cnet4 U= f= k Phase= 8 Theta= Vac : V6 netp6 cnet3 U= f= k Phase= 8 Theta=. Vac : V netp cnet2 U= f= k Phase= 8 Theta= Vac : V4 netp4 cnet U= f= k Phase= Theta= Vac : V3 netp3 cnet U= Phase= Theta= nan f= e+9 Vdc : V netp r e f U= V R: R netp r e f R= k Vdc : V2 netp2 r e f U= V R: R2 netp2 r e f R= k Vdc : V3 cnet r e f U= R: R3 netp3 r e f R= k Vdc : V4 cnet r e f U= R: R4 netp4 r e f R= k Vdc : V cnet2 r e f U= R: R netp r e f R= k Vdc : V6 cnet3 r e f U= R: R6 netp6 r e f R= k Vdc : V7 cnet4 r e f U= R: R7 netp7 r e f R= k Vdc : V8 cnet r e f U= V R: R8 netp8 r e f R= k Vdc : V9 cnet6 r e f U= R: R9 netp9 r e f R= k Vdc : V cnet7 r e f U= R: R netp r e f R= k Vdc : V cnet8 r e f U= R: R netp r e f R= k Sub : X r e f netp netp2 netp3 netp4 netp netp6 netp7 netp8 netp9 netp netp Type= S2Q TEST2.DC:DC Temp= r e l t o l=. a b s t o l= pa v n t o l= uv saveops= no MaxIter= s a v e A l l= no convhelper= none S o l v e r= CroutLU.TR: TR Type= l i n Start= Stop= ms Points= 2 IntegrationMethod= Gear Order= 6 I n i t i a l S t e p= ns MinStep= e 6 MaxIter= r e l t o l=. a b s t o l= pa v n t o l= uv Temp= LTEreltol= e 3 LTEabstol= e 6 LTEfactor= S o l v e r= CroutLU relaxtsr= no i n i t i a l D C= yes MaxStep= Sub : SUB vp vp2 vp3 vp4 vp vp6 vp7 vp8 vp9 vp vp Type= S2Q t e s t 2 Figure 2: March : Qucs netlist showing V3 error [Edited to fit on page width]

7 2 3 vp vp2 vp3 vp4 dc simulation DC S2Q_test vp vp6 vp7 vp8 vp9 vp vp transient simulation TR Type=lin Start= Stop= ms IntegrationMethod=Gear Order=6 SUB Figure 3: SPICE to Qucs conversion: Test2 simulation schematic 6. Test 6 : Vp6.Vt; Pass - see note 2 below. 7. Test 7 : Vp7.Vt; Pass - see note 2 below. 8. Test 8 : Vp8.Vt; Pass - see note 2 below. 9. Test 9 : Vp9.Vt; Pass - see note 2 below.. Test : Vp.Vt; Pass - see note 2 below.. Test : Vp.Vt; Pass - see note 3 below.. The SPICE SIN generator assumes that the frequency of the generated sinusoidal signal equals /TSTOP if not explicitly given. Hence, in such cases a.tran statement must be present in the simulated SPICE netlist; if a.tran statement is not included a default frequency of f = GHz is used. Also, when setting the transient simulation parameters using a Qucs transient analysis icon turn off SPICE simulation in the Edit SPICE Properties dialog box, otherwise two transient simulations are undertaken by Qucs. 2. SPICE parameter TD is treated differently by Qucs. In SPICE TD is the from seconds before the sinusoidal signal starts, causing the sinusoid to be non-linear. In Qucs TD is implemented as a phase shift of a linear sinusoidal signal. In the test example TD is.m seconds which at f = khz gives a phase shift of 8 and is clearly visible in the test results. An error will probably occur if TD is greater than one signal period, m second in the test example. 6

8 2 2 vp.vt vp2.vt vp3.vt e e e vp4.vt vp.vt vp6.vt - e e e vp7.vt - vp8.vt vp9.vt - - e e e vp.vt vp.vt - - e e Figure 4: March 2: SPICE to Qucs conversion: Test2 waveforms 3. Changes in CVS code have resulted in correct DC levels. 7

9 # Qucs.. /media/hda2/s2q t e s t 2 p r j /S2Q( t e s t 2 ). sch. Def : S2Q t e s t 2 net net net2 net3 net4 net net6 net7 net8 net9 net Sub : X net net net2 net3 net4 net net6 net7 net8 net9 net gnd Type= S2Q t e s t 2 c i r. Def : S2Q t e s t 2 c i r netp netp2 netp3 netp4 netp netp6 netp7 netp8 netp9 netp netp r e f. Def : S2Q TEST2 r e f netp netp2 netp3 netp4 netp netp6 netp7 netp8 netp9 netp netp Vac : V netp cnet8 U= f= k Phase= 8 Theta= Vac : V netp cnet7 U= f= k Phase= 8 Theta= Vac : V9 netp9 cnet6 U= f= k Phase= 8 Theta= Vac : V8 netp8 cnet U= f= k Phase= 8 Theta= Vac : V7 netp7 cnet4 U= f= k Phase= 8 Theta= Vac : V6 netp6 cnet3 U= f= k Phase= 8 Theta=. Vac : V netp cnet2 U= f= k Phase= 8 Theta= Vac : V4 netp4 cnet U= f= k Phase= Theta= Vac : V3 netp3 cnet U= Phase= Theta= f= Vdc : V netp r e f U= V R: R netp r e f R= k Vdc : V2 netp2 r e f U= V R: R2 netp2 r e f R= k Vdc : V3 cnet r e f U= R: R3 netp3 r e f R= k Vdc : V4 cnet r e f U= R: R4 netp4 r e f R= k Vdc : V cnet2 r e f U= R: R netp r e f R= k Vdc : V6 cnet3 r e f U= R: R6 netp6 r e f R= k Vdc : V7 cnet4 r e f U= R: R7 netp7 r e f R= k Vdc : V8 cnet r e f U= R: R8 netp8 r e f R= k Vdc : V9 cnet6 r e f U= R: R9 netp9 r e f R= k Vdc : V cnet7 r e f U= R: R netp r e f R= k Vdc : V cnet8 r e f U= R: R netp r e f R= k Sub : X r e f netp netp2 netp3 netp4 netp netp6 netp7 netp8 netp9 netp netp Type= S2Q TEST2.TR:TRAN Points= Stop= ms Type= l i n Start=.DC:DC Temp= r e l t o l=. a b s t o l= pa v n t o l= uv saveops= no MaxIter= s a v e A l l= no convhelper= none S o l v e r= CroutLU.TR: TR Type= l i n Start= Stop= ms Points= 2 IntegrationMethod= Gear Order= 6 I n i t i a l S t e p= ns MinStep= e 6 MaxIter= r e l t o l=. a b s t o l= pa v n t o l= uv Temp= LTEreltol= e 3 LTEabstol= e 6 LTEfactor= S o l v e r= CroutLU relaxtsr= no i n i t i a l D C= yes MaxStep= Sub : SUB vp vp2 vp3 vp4 vp vp6 vp7 vp8 vp9 vp vp Type= S2Q t e s t 2 Figure : March 2: Qucs netlist showing V3 error [Edited to fit on page width] 8

10 References. A. Vladimirescu, Kaihe Zhang, A.R. Newton, D.O Pederson A. Sangiovanni- Vincentelli, SPICE 2G User s Guide ( Aug 98), Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, Ca., B. Johnson, T. Quarles, A.R. Newton, P.O. Pederson, A.Sangiovanni-Vincentelli, SPICE3 Version 3f User s Manual (October 972), Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, Ca., Andrei Vladimirescu, THE SPICE book,994, John Wiley and Sons. Inc., ISBN