I have a very simple OpAmp circuit using an LM324. I used that because it is apparently the equiv of the NTE987 that I actually got from Microcenter. I was just playing around with the old school Forest Mimms Enegeers Mini Notebook series (OP Amp IC Circuits). I was trying to do circuit 1 (yes, thats right, I am having issues with the first circuit. :\ ).
Setup
I am trying to simulate the circuit using ngspice through KiCad. The schematic that I generated is the following:
I used the following pspice model from http://www.ti.com/product/LM324/toolssoftware
* LMX24_LM2902 - Rev. A
* Created by Paul Goedeke; November 16, 2018
* Created with Green-Williams-Lis Op Amp Macro-model Architecture
* Copyright 2018 by Texas Instruments Corporation
******************************************************
* MACRO-MODEL SIMULATED PARAMETERS:
******************************************************
* OPEN-LOOP GAIN AND PHASE VS. FREQUENCY WITH RL, CL EFFECTS (Aol)
* UNITY GAIN BANDWIDTH (GBW)
* INPUT COMMON-MODE REJECTION RATIO VS. FREQUENCY (CMRR)
* POWER SUPPLY REJECTION RATIO VS. FREQUENCY (PSRR)
* DIFFERENTIAL INPUT IMPEDANCE (Zid)
* COMMON-MODE INPUT IMPEDANCE (Zic)
* OPEN-LOOP OUTPUT IMPEDANCE VS. FREQUENCY (Zo)
* OUTPUT CURRENT THROUGH THE SUPPLY (Iout)
* INPUT VOLTAGE NOISE DENSITY VS. FREQUENCY (en)
* INPUT CURRENT NOISE DENSITY VS. FREQUENCY (in)
* OUTPUT VOLTAGE SWING vs. OUTPUT CURRENT (Vo)
* SHORT-CIRCUIT OUTPUT CURRENT (Isc)
* QUIESCENT CURRENT (Iq)
* SETTLING TIME VS. CAPACITIVE LOAD (ts)
* SLEW RATE (SR)
* SMALL SIGNAL OVERSHOOT VS. CAPACITIVE LOAD
* LARGE SIGNAL RESPONSE
* OVERLOAD RECOVERY TIME (tor)
* INPUT BIAS CURRENT (Ib)
* INPUT OFFSET CURRENT (Ios)
* INPUT OFFSET VOLTAGE (Vos)
* INPUT COMMON-MODE VOLTAGE RANGE (Vcm)
* INPUT OFFSET VOLTAGE VS. INPUT COMMON-MODE VOLTAGE (Vos vs. Vcm)
* INPUT/OUTPUT ESD CELLS (ESDin, ESDout)
******************************************************
.subckt LMX24_LM2902 IN+ IN- VCC VEE OUT
******************************************************
* MODEL DEFINITIONS:
.model BB_SW VSWITCH(Ron=50 Roff=1e12 Von=700e-3 Voff=0)
.model ESD_SW VSWITCH(Ron=50 Roff=1e12 Von=250e-3 Voff=0)
.model OL_SW VSWITCH(Ron=1e-3 Roff=1e9 Von=900e-3 Voff=800e-3)
.model OR_SW VSWITCH(Ron=10e-3 Roff=1e9 Von=1e-3 Voff=0)
.model R_NOISELESS RES(T_ABS=-273.15)
******************************************************
I_OS ESDn MID -18N
I_B 37 MID -20N
V_GRp 57 MID 180
V_GRn 58 MID -180
V_ISCp 51 MID 40
V_ISCn 52 MID -40
V_ORn 45 VCLP -1.2
V11 56 44 0
V_ORp 43 VCLP 1.2
V12 55 42 0
V4 33 OUT 0
VCM_MIN 79 VEE_B 0
VCM_MAX 80 VCC_B -1.5
I_Q VCC VEE 175U
V_OS 86 37 1.8M
R61 MID 22 R_NOISELESS 8.001K
C16 22 23 19.89P
R58 23 22 R_NOISELESS 100MEG
GVCCS2 23 MID VEE_B MID -992.9M
R57 MID 23 R_NOISELESS 1
XU3 VCC_B VEE_B 24 25 26 27 MID PHASEREV_0
XU1 VIMON MID CRS CRS_DIST_0
C21 28 29 313.8N
C22 30 31 636.6F
R70 31 MID R_NOISELESS 2.5
R67 31 30 R_NOISELESS 10K
R66 30 MID R_NOISELESS 1
XU2 31 MID MID 32 VCCS_LIM_ZO_0
GVCCS4 30 MID 29 MID -4.3
R65 29 MID R_NOISELESS 3.03K
R64 29 28 R_NOISELESS 10K
R63 28 MID R_NOISELESS 1
GVCCS3 28 MID CL_CLAMP 33 -90
R62 32 MID R_NOISELESS 1
C29 34 MID 47F
R78 MID 34 R_NOISELESS 1MEG
GVCCS9 34 MID 35 MID -1U
XU5 36 MID MID CLAMP CRS MID VCCS_LIM_2_EN_0
C28 38 MID 1P
R77 39 38 R_NOISELESS 100
C27 40 MID 1P
R76 41 40 R_NOISELESS 100
R75 MID 42 R_NOISELESS 1
GVCCS8 42 MID 43 MID -1
R74 44 MID R_NOISELESS 1
GVCCS7 44 MID 45 MID -1
Xi_nn ESDn MID FEMT_0
Xi_np MID 37 FEMT_0
Xe_n ESDp 37 VNSE_0
C25 35 MID 47F
R69 MID 35 R_NOISELESS 1MEG
GVCCS6 35 MID VSENSE MID -1U
C20 CLAMP MID 9N
R68 MID CLAMP R_NOISELESS 1MEG
R44 MID 36 R_NOISELESS 1MEG
XVCCS_LIM_1 46 27 MID 36 VCCS_LIM_1_0
Rdummy MID 33 R_NOISELESS 25K
Rx 33 32 R_NOISELESS 250K
R56 MID 47 R_NOISELESS 1K
C15 47 48 1.592P
R55 48 47 R_NOISELESS 100MEG
GVCCS1 48 MID VCC_B MID -100M
R54 MID 48 R_NOISELESS 1
R49 MID 49 R_NOISELESS 4.616K
C14 49 50 26.53P
R48 50 49 R_NOISELESS 100MEG
G_adjust 50 MID ESDp MID -685.2M
Rsrc MID 50 R_NOISELESS 1
XIQPos VIMON MID MID VCC VCCS_LIMIT_IQ_0
XIQNeg MID VIMON VEE MID VCCS_LIMIT_IQ_0
C_DIFF ESDp ESDn 1P
XCL_AMP 51 52 VIMON MID 53 54 CLAMP_AMP_LO_0
SOR_SWp CLAMP 55 CLAMP 55 S_VSWITCH_1
SOR_SWn 56 CLAMP 56 CLAMP S_VSWITCH_2
XGR_AMP 57 58 59 MID 60 61 CLAMP_AMP_HI_0
R39 57 MID R_NOISELESS 1T
R37 58 MID R_NOISELESS 1T
R42 VSENSE 59 R_NOISELESS 1M
C19 59 MID 1F
R38 60 MID R_NOISELESS 1
R36 MID 61 R_NOISELESS 1
R40 60 62 R_NOISELESS 1M
R41 61 63 R_NOISELESS 1M
C17 62 MID 1F
C18 MID 63 1F
XGR_SRC 62 63 CLAMP MID VCCS_LIM_GR_0
R21 53 MID R_NOISELESS 1
R20 MID 54 R_NOISELESS 1
R29 53 64 R_NOISELESS 1M
R30 54 65 R_NOISELESS 1M
C9 64 MID 1F
C8 MID 65 1F
XCL_SRC 64 65 CL_CLAMP MID VCCS_LIM_4_0
R22 51 MID R_NOISELESS 1T
R19 MID 52 R_NOISELESS 1T
XCLAWp VIMON MID 66 VCC_B VCCS_LIM_CLAW+_0
XCLAWn MID VIMON VEE_B 67 VCCS_LIM_CLAW-_0
R12 66 VCC_B R_NOISELESS 1K
R16 66 68 R_NOISELESS 1M
R13 VEE_B 67 R_NOISELESS 1K
R17 69 67 R_NOISELESS 1M
C6 69 MID 1F
C5 MID 68 1F
G2 VCC_CLP MID 68 MID -1M
R15 VCC_CLP MID R_NOISELESS 1K
G3 VEE_CLP MID 69 MID -1M
R14 MID VEE_CLP R_NOISELESS 1K
XCLAW_AMP VCC_CLP VEE_CLP VOUT_S MID 70 71 CLAMP_AMP_LO_0
R26 VCC_CLP MID R_NOISELESS 1T
R23 VEE_CLP MID R_NOISELESS 1T
R25 70 MID R_NOISELESS 1
R24 MID 71 R_NOISELESS 1
R27 70 72 R_NOISELESS 1M
R28 71 73 R_NOISELESS 1M
C11 72 MID 1F
C10 MID 73 1F
XCLAW_SRC 72 73 CLAW_CLAMP MID VCCS_LIM_3_0
H2 41 MID V11 -1
H3 39 MID V12 1
C12 SW_OL MID 100P
R32 74 SW_OL R_NOISELESS 100
R31 74 MID R_NOISELESS 1
XOL_SENSE MID 74 40 38 OL_SENSE_0
S1 28 29 SW_OL MID S_VSWITCH_3
H1 75 MID V4 1K
S7 VEE OUT VEE OUT S_VSWITCH_4
S6 OUT VCC OUT VCC S_VSWITCH_5
R11 MID 76 R_NOISELESS 1T
R18 76 VOUT_S R_NOISELESS 100
C7 VOUT_S MID 10P
E5 76 MID OUT MID 1
C13 VIMON MID 10P
R33 75 VIMON R_NOISELESS 100
R10 MID 75 R_NOISELESS 1T
R47 77 VCLP R_NOISELESS 100
C24 VCLP MID 100P
E4 77 MID CL_CLAMP MID 1
R46 MID CL_CLAMP R_NOISELESS 1K
G9 CL_CLAMP MID CLAW_CLAMP MID -1M
R45 MID CLAW_CLAMP R_NOISELESS 1K
G8 CLAW_CLAMP MID 34 MID -1M
R43 MID VSENSE R_NOISELESS 1K
G15 VSENSE MID CLAMP MID -1M
C4 46 MID 1F
R9 46 78 R_NOISELESS 1M
R7 MID 79 R_NOISELESS 1T
R6 80 MID R_NOISELESS 1T
R8 MID 78 R_NOISELESS 1
XVCM_CLAMP 26 MID 78 MID 80 79 VCCS_EXT_LIM_0
E1 MID 0 81 0 1
R89 VEE_B 0 R_NOISELESS 1
R5 82 VEE_B R_NOISELESS 1M
C3 82 0 1F
R60 81 82 R_NOISELESS 1MEG
C1 81 0 1
R3 81 0 R_NOISELESS 1T
R59 83 81 R_NOISELESS 1MEG
C2 83 0 1F
R4 VCC_B 83 R_NOISELESS 1M
R88 VCC_B 0 R_NOISELESS 1
G17 VEE_B 0 VEE 0 -1
G16 VCC_B 0 VCC 0 -1
R_PSR 84 24 R_NOISELESS 1K
G_PSR 24 84 47 22 -1M
R2 25 ESDn R_NOISELESS 1M
R1 84 85 R_NOISELESS 1M
R_CMR 86 85 R_NOISELESS 1K
G_CMR 85 86 49 MID -1M
C_CMn ESDn MID 2P
C_CMp MID ESDp 2P
R53 ESDn MID R_NOISELESS 1T
R52 MID ESDp R_NOISELESS 1T
R35 IN- ESDn R_NOISELESS 10M
R34 IN+ ESDp R_NOISELESS 10M
.MODEL S_VSWITCH_1 VSWITCH (RON=10M ROFF=1T VON=10M VOFF=0)
.MODEL S_VSWITCH_2 VSWITCH (RON=10M ROFF=1T VON=10M VOFF=0)
.MODEL S_VSWITCH_3 VSWITCH (RON=1M ROFF=1T VON=500M VOFF=100M)
.MODEL S_VSWITCH_4 VSWITCH (RON=50 ROFF=1T VON=500M VOFF=450M)
.MODEL S_VSWITCH_5 VSWITCH (RON=50 ROFF=1T VON=500M VOFF=450M)
.ENDS LMX24_LM2902
*
.SUBCKT PHASEREV_0 VCC VEE VIN+ VIN- VOUT+ VOUT- MID
E1 VOUT+ MID VALUE={IF(V(VIN+,MID)<V(VEE,MID)-0.3,V(VCC,MID),V(VIN+,MID))}
E2 VOUT- MID VALUE={IF(V(VIN-,MID)<V(VEE,MID)-0.3,V(VCC,MID),V(VIN-,MID))}
.ENDS
*
.SUBCKT CRS_DIST_0 VIMON MID OUT
V1 VREF MID -40M
ESHF VSHF MID VIMON VREF 1
GZC MID ZC VALUE = {SGN(V(VSHF,MID))}
R1 ZC MID 1
C1 ZC MID 2U
GCR MID OUT VALUE = {IF((ABS(V(ZC,MID))<=0.9),0,1)}
R2 OUT MID 1
.ENDS
*
.SUBCKT VCCS_LIM_ZO_0 VC+ VC- IOUT+ IOUT-
.PARAM GAIN = 4E3
.PARAM IPOS = 1E6
.PARAM INEG = -1E6
G1 IOUT+ IOUT- VALUE={LIMIT(GAIN*V(VC+,VC-),INEG,IPOS)}
.ENDS
*
.SUBCKT VCCS_LIM_2_EN_0 VC+ VC- IOUT+ IOUT- EN MID
.PARAM GAIN = 8.4E-4
.PARAM IPOS = 0.0048
.PARAM INEG = -0.0048
G1 IOUT+ IOUT- VALUE={LIMIT(GAIN*V(EN,MID)*V(VC+,VC-),INEG,IPOS)}
.ENDS
*
.SUBCKT FEMT_0 1 2
.PARAM FLWF=1E-3
.PARAM NLFF=500
.PARAM NVRF=500
.PARAM GLFF={PWR(FLWF,0.25)*NLFF/1164}
.PARAM RNVF={1.184*PWR(NVRF,2)}
.MODEL DVNF D KF={PWR(FLWF,0.5)/1E11} IS=1.0E-16
I1 0 7 10E-3
I2 0 8 10E-3
D1 7 0 DVNF
D2 8 0 DVNF
E1 3 6 7 8 {GLFF}
R1 3 0 1E9
R2 3 0 1E9
R3 3 6 1E9
E2 6 4 5 0 10
R4 5 0 {RNVF}
R5 5 0 {RNVF}
R6 3 4 1E9
R7 4 0 1E9
G1 1 2 3 4 1E-6
.ENDS
*
.SUBCKT VNSE_0 1 2
.PARAM FLW=10
.PARAM NLF=80
.PARAM NVR=35
.PARAM GLF={PWR(FLW,0.25)*NLF/1164}
.PARAM RNV={1.184*PWR(NVR,2)}
.MODEL DVN D KF={PWR(FLW,0.5)/1E11} IS=1.0E-16
I1 0 7 10E-3
I2 0 8 10E-3
D1 7 0 DVN
D2 8 0 DVN
E1 3 6 7 8 {GLF}
R1 3 0 1E9
R2 3 0 1E9
R3 3 6 1E9
E2 6 4 5 0 10
R4 5 0 {RNV}
R5 5 0 {RNV}
R6 3 4 1E9
R7 4 0 1E9
E3 1 2 3 4 1
.ENDS
*
.SUBCKT VCCS_LIM_1_0 VC+ VC- IOUT+ IOUT-
.PARAM GAIN = 1E-4
.PARAM IPOS = .5
.PARAM INEG = -.5
G1 IOUT+ IOUT- VALUE={LIMIT(GAIN*V(VC+,VC-),INEG,IPOS)}
.ENDS
*
.SUBCKT VCCS_LIMIT_IQ_0 VC+ VC- IOUT+ IOUT-
.PARAM GAIN = 1E-3
G1 IOUT- IOUT+ VALUE={IF( (V(VC+,VC-)<=0),0,GAIN*V(VC+,VC-) )}
.ENDS
*
.SUBCKT CLAMP_AMP_LO_0 VC+ VC- VIN COM VO+ VO-
.PARAM G=1
GVO+ COM VO+ VALUE = {IF(V(VIN,COM)>V(VC+,COM),((V(VIN,COM)-V(VC+,COM))*G),0)}
GVO- COM VO- VALUE = {IF(V(VIN,COM)<V(VC-,COM),((V(VC-,COM)-V(VIN,COM))*G),0)}
.ENDS
*
.SUBCKT CLAMP_AMP_HI_0 VC+ VC- VIN COM VO+ VO-
.PARAM G=10
GVO+ COM VO+ VALUE = {IF(V(VIN,COM)>V(VC+,COM),((V(VIN,COM)-V(VC+,COM))*G),0)}
GVO- COM VO- VALUE = {IF(V(VIN,COM)<V(VC-,COM),((V(VC-,COM)-V(VIN,COM))*G),0)}
.ENDS
*
.SUBCKT VCCS_LIM_GR_0 VC+ VC- IOUT+ IOUT-
.PARAM GAIN = 1
.PARAM IPOS = 0.013
.PARAM INEG = -0.013
G1 IOUT+ IOUT- VALUE={LIMIT(GAIN*V(VC+,VC-),INEG,IPOS)}
.ENDS
*
.SUBCKT VCCS_LIM_4_0 VC+ VC- IOUT+ IOUT-
.PARAM GAIN = 1
.PARAM IPOS = 1.04
.PARAM INEG = -1.04
G1 IOUT+ IOUT- VALUE={LIMIT(GAIN*V(VC+,VC-),INEG,IPOS)}
.ENDS
*
.SUBCKT VCCS_LIM_CLAW+_0 VC+ VC- IOUT+ IOUT-
G1 IOUT+ IOUT- TABLE {ABS(V(VC+,VC-))} =
+(0, 1.17E-03)
+(0.0046251, 1.17E-3)
+(0.15716, 1.21E-3)
+(1.3309, 1.28E-3)
+(35.075, 2.12E-3)
+(35.680, 2.55E-3)
+(36.033, 2.84E-3)
+(37.416, 7.97E-3)
.ENDS
*
.SUBCKT VCCS_LIM_CLAW-_0 VC+ VC- IOUT+ IOUT-
G1 IOUT+ IOUT- TABLE {ABS(V(VC+,VC-))} =
+(0.010, 2.50E-5)
+(0.070, 2.50E-5)
+(0.090, 5.80E-4)
+(0.100, 6.06E-4)
+(0.760, 7.14E-4)
+(1.440, 7.62E-4)
+(8.000, 1.10E-3)
+(13.60, 1.55E-3)
+(15.45, 1.75E-3)
+(17.26, 2.15E-3)
+(18.87, 2.94E-3)
+(21.58, 4.50E-3)
+(25.53, 1.02E-2)
.ENDS
*
.SUBCKT VCCS_LIM_3_0 VC+ VC- IOUT+ IOUT-
.PARAM GAIN = 1
.PARAM IPOS = 0.435
.PARAM INEG = -0.435
G1 IOUT+ IOUT- VALUE={LIMIT(GAIN*V(VC+,VC-),INEG,IPOS)}
.ENDS
*
.SUBCKT OL_SENSE_0 COM SW+ OLN OLP
GSW+ COM SW+ VALUE = {IF((V(OLN,COM)>10E-3 | V(OLP,COM)>10E-3),1,0)}
.ENDS
*
.SUBCKT VCCS_EXT_LIM_0 VIN+ VIN- IOUT- IOUT+ VP+ VP-
.PARAM GAIN = 1
G1 IOUT+ IOUT- VALUE={LIMIT(GAIN*V(VIN+,VIN-),V(VP-,VIN-), V(VP+,VIN-))}
.ENDS
*
I also ensured that use the alternative node sequence of "3 2 4 11 1". At least I think that is how this is supposed to work (you just align the PIN numbers with the sub-circuit parameter order?).
Finally, I enabled pspice compatibility mode by placing the following in my .spiceiinit file:
* user provided init file
set ngbehavior=ps
The simulation parameters were:
.tran 1u 1m
Problem (Output)
My Vout is showing an output with a bias of 3.768V. I expected the output to be 5*0.5 = 2.5V because the ratio of the feedback resistor and the input resistor was 5 and the Vin was set to oscillate around 0.5V. Apparently, the Vout does not depend at all on Vin and is just this value all the time. Here is an image of the Vout.
Humm, it will not let me upload the image? Very strange. Anyway, it is oscillating around the stated 3.768.
The spice execution model output is the following:
Circuit: KiCad schematic
Reducing trtol to 1 for xspice 'A' devices
Doing analysis at TEMP = 27.000000 and TNOM = 27.000000
Warning: v2: no DC value, transient time 0 value used
Note: Starting dynamic gmin stepping
Trying gmin = 1.0000E-03 Note: One successful gmin step
Trying gmin = 1.0000E-04 Note: One successful gmin step
Trying gmin = 1.0000E-05 Note: One successful gmin step
Trying gmin = 1.0000E-06 Note: One successful gmin step
Trying gmin = 1.0000E-07 Note: One successful gmin step
Trying gmin = 3.1623E-08 Note: One successful gmin step
Trying gmin = 5.6234E-09 Note: One successful gmin step
Trying gmin = 5.6234E-10 Note: One successful gmin step
Trying gmin = 5.6234E-11 Note: One successful gmin step
Trying gmin = 5.6234E-12 Note: One successful gmin step
Trying gmin = 1.0000E-12 Note: One successful gmin step
Note: Dynamic gmin stepping completed
Initial Transient Solution
--------------------------
Node Voltage
---- -------
vout 3.7681
net-_rf-pad2_ 1.0447
vin 0.5
xu1.esdn 1.80025e-10
xu1.mid 2.5
xu1.37 1.0447
xu1.57 182.5
xu1.58 -177.5
xu1.51 42.5
xu1.52 -37.5
xu1.45 4.23694
xu1.vclp 5.43694
xu1.56 4.23694
xu1.44 4.23694
xu1.43 6.63694
xu1.55 6.64173
xu1.42 6.64173
xu1.33 3.7681
xu1.79 2.5e-06
xu1.vee_b 2.5e-06
xu1.80 3.5
xu1.vcc_b 5
vcc2 5
vee 0
xu1.86 1.0465
xu1.22 2.4998
xu1.23 0.0177525
xu1.26 1.04665
xu1.xu3.e1_int1 -1.45334
xu1.24 1.04665
xu1.27 1.80025e-10
xu1.xu3.e2_int1 -2.5
xu1.25 1.80025e-10
xu1.xu1.vref 2.46
xu1.xu1.vshf 3.08468
xu1.vimon 3.04468
xu1.xu1.zc 3.5
xu1.xu1.gzc_int1 1
xu1.crs 3.5
xu1.xu1.gcr_int1 1
xu1.28 152.684
xu1.29 37.4238
xu1.30 152.657
xu1.31 2.53753
xu1.32 152.619
xu1.xu2.g1_int1 150.12
xu1.cl_clamp 5.43694
xu1.34 6.65013
xu1.35 6.65013
xu1.clamp 6.65013
xu1.xu5.g1_int1 0.0048
xu1.36 107.165
xu1.38 2.50479
xu1.39 2.50479
xu1.40 2.5
xu1.41 2.5
xu1.xi_nn.7 0.833786
xu1.xi_nn.8 0.833786
xu1.xi_nn.3 0
xu1.xi_nn.6 0
xu1.xi_nn.4 0
xu1.xi_nn.5 0
xu1.xi_np.7 0.833786
xu1.xi_np.8 0.833786
xu1.xi_np.3 0
xu1.xi_np.6 0
xu1.xi_np.4 0
xu1.xi_np.5 0
xu1.xe_n.7 0.833786
xu1.xe_n.8 0.833786
xu1.xe_n.3 0
xu1.xe_n.6 0
xu1.xe_n.4 0
xu1.xe_n.5 0
xu1.esdp 1.0447
xu1.vsense 6.65013
xu1.xvccs_lim_1.g1_int1 0.000104665
xu1.46 1.04665
xu1.47 2.5
xu1.48 2.75
xu1.49 2.49995
xu1.50 1.50283
xu1.xiqpos.g1_int1 0.00054468
xu1.xiqneg.g1_int1 0
xu1.53 2.5
xu1.xcl_amp.gvo+_int1 0
xu1.54 2.5
xu1.xcl_amp.gvo-_int1 0
xu1.60 2.5
xu1.xgr_amp.gvo+_int1 0
xu1.59 6.65013
xu1.61 2.5
xu1.xgr_amp.gvo-_int1 0
xu1.62 2.5
xu1.63 2.5
xu1.xgr_src.g1_int1 0
xu1.64 2.5
xu1.65 2.5
xu1.xcl_src.g1_int1 0
xu1.66 3.76689
xu1.xclawp.g1_int1 0.00123311
xu1.67 0.678768
xu1.xclawn.g1_int1 0.000678766
xu1.68 3.76689
xu1.69 0.678768
xu1.vcc_clp 3.76689
xu1.vee_clp 0.678768
xu1.70 2.50121
xu1.xclaw_amp.gvo+_int1 0.00121319
xu1.vout_s 3.7681
xu1.71 2.5
xu1.xclaw_amp.gvo-_int1 0
xu1.72 2.50121
xu1.73 2.5
xu1.claw_clamp 5.43694
xu1.xclaw_src.g1_int1 0.00121319
xu1.sw_ol 2.5
xu1.74 2.5
xu1.xol_sense.gsw+_int1 0
xu1.75 3.04468
xu1.76 3.7681
xu1.77 5.43694
xu1.78 1.04665
xu1.xvcm_clamp.g1_int1 -1.45334
xu1.81 2.5
xu1.82 2.5025e-06
xu1.83 5
xu1.84 1.04645
xu1.85 1.04645
b.xu1.xvcm_clamp.bg1#branch 0
b.xu1.xol_sense.bgsw+#branch 0
b.xu1.xclaw_src.bg1#branch 0
b.xu1.xclaw_amp.bgvo-#branch 0
b.xu1.xclaw_amp.bgvo+#branch 0
b.xu1.xclawn.bg1#branch 0
b.xu1.xclawp.bg1#branch 0
b.xu1.xcl_src.bg1#branch 0
b.xu1.xgr_src.bg1#branch 0
b.xu1.xgr_amp.bgvo-#branch 0
b.xu1.xgr_amp.bgvo+#branch 0
b.xu1.xcl_amp.bgvo-#branch 0
b.xu1.xcl_amp.bgvo+#branch 0
b.xu1.xiqneg.bg1#branch 0
b.xu1.xiqpos.bg1#branch 0
b.xu1.xvccs_lim_1.bg1#branch 0
b.xu1.xu5.bg1#branch 0
b.xu1.xu2.bg1#branch 0
b.xu1.xu1.bgcr#branch 0
b.xu1.xu1.bgzc#branch 0
b.xu1.xu3.be2#branch 0
b.xu1.xu3.be1#branch 0
h.xu1.h1#branch -5.4468e-13
v.xu1.v4#branch 0.00054468
h.xu1.h3#branch 0
v.xu1.v12#branch 0.00479585
h.xu1.h2#branch 0
v.xu1.v11#branch 0
e.xu1.e1#branch -3.80027e-08
e.xu1.e4#branch 0
e.xu1.e5#branch -1.26811e-12
e.xu1.xe_n.e3#branch -1.99999e-08
e.xu1.xe_n.e2#branch 0
e.xu1.xe_n.e1#branch 0
e.xu1.xi_np.e2#branch 0
e.xu1.xi_np.e1#branch 0
e.xu1.xi_nn.e2#branch 0
e.xu1.xi_nn.e1#branch 0
e.xu1.xu1.eshf#branch 0
e.xu1.xu3.e2#branch 0
e.xu1.xu3.e1#branch 0
v2#branch 0.0005447
v3#branch -0.00071968
v4#branch -0.000175
v.xu1.xu1.v1#branch 0
v.xu1.v_os#branch -7.9498e-14
v.xu1.vcm_max#branch -9.99999e-13
v.xu1.vcm_min#branch 2.5e-12
v.xu1.v_orp#branch 0
v.xu1.v_orn#branch 0
v.xu1.v_iscn#branch 4e-11
v.xu1.v_iscp#branch -4e-11
v.xu1.v_grn#branch 1.8e-10
v.xu1.v_grp#branch -1.8e-10
Reference value : 0.00000e+00
No. of Data Rows : 1008
Can somebody help me understand why I am not seeing what I expected to see (an oscillation around 2.5V for Vout)?
EDIT:
I have taken the suggestions that have been provided and swapped the op-amp inputs. The schematic is now:
However, when I run the simulation, the graphical output of Vout is:
This is still not he magnitude of 2.5V which is what I was expecting. The simulation output is the following:
Circuit: KiCad schematic
Reducing trtol to 1 for xspice 'A' devices
Doing analysis at TEMP = 27.000000 and TNOM = 27.000000
Warning: v2: no DC value, transient time 0 value used
Note: Starting dynamic gmin stepping
Trying gmin = 1.0000E-03 Note: One successful gmin step
Trying gmin = 1.0000E-04 Note: One successful gmin step
Trying gmin = 1.0000E-05 Note: One successful gmin step
Trying gmin = 1.0000E-06 Note: One successful gmin step
Trying gmin = 1.0000E-07 Note: One successful gmin step
Trying gmin = 1.0000E-08 Note: One successful gmin step
Trying gmin = 1.0000E-09 Note: One successful gmin step
Trying gmin = 1.0000E-10 Note: One successful gmin step
Trying gmin = 1.0000E-11 Note: One successful gmin step
Trying gmin = 1.0000E-12 Note: One successful gmin step
Trying gmin = 1.0000E-12 Note: One successful gmin step
Note: Dynamic gmin stepping completed
Initial Transient Solution
--------------------------
Node Voltage
---- -------
vout 0.0700215
net-_rf-pad2_ 0.428352
vin 0.5
xu1.esdn 0.428352
xu1.mid 2.5
... Truncated because of post length requirements
Reference value : 0.00000e+00
No. of Data Rows : 1014
Any further suggestions, remember, I am very new to this, so I could be missing something very basic. Thanks for the help.
