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A simple GFSK demodulator inspired from the paper : A GFSK demodulator for low-IF Bluetooth receiver
Version 4
SHEET 1 1976 956
WIRE 512 -480 416 -480
WIRE 656 -480 592 -480
WIRE 1104 -416 1104 -464
WIRE -832 -384 -832 -432
WIRE -1296 -256 -1536 -256
WIRE -1152 -256 -1296 -256
WIRE -1088 -256 -1152 -256
WIRE -976 -256 -1024 -256
WIRE -832 -256 -832 -320
WIRE -832 -256 -896 -256
WIRE -768 -256 -832 -256
WIRE 1312 -240 144 -240
WIRE -768 -224 -816 -224
WIRE -608 -224 -704 -224
WIRE 80 -224 80 -304
WIRE -1152 -176 -1152 -256
WIRE -816 -176 -816 -224
WIRE -816 -176 -1152 -176
WIRE 416 -176 416 -480
WIRE 848 -176 416 -176
WIRE 992 -176 912 -176
WIRE 1440 -176 992 -176
WIRE 1584 -176 1504 -176
WIRE 1696 -176 1584 -176
WIRE 1936 -176 1776 -176
WIRE 848 -144 768 -144
WIRE -608 -80 -608 -224
WIRE -528 -80 -608 -80
WIRE -320 -80 -464 -80
WIRE 1936 -80 1936 -176
WIRE 224 -64 224 -112
WIRE -528 -48 -608 -48
WIRE 80 -48 80 -144
WIRE 192 -48 80 -48
WIRE 416 -48 416 -176
WIRE 496 -48 416 -48
WIRE 352 -32 256 -32
WIRE 496 -32 352 -32
WIRE -832 -16 -832 -80
WIRE 144 -16 144 -240
WIRE 192 -16 144 -16
WIRE 496 -16 416 -16
WIRE 640 -16 560 -16
WIRE 224 48 224 0
WIRE -1872 96 -2256 96
WIRE -1536 96 -1536 -256
WIRE -1536 96 -1728 96
WIRE 416 96 416 -16
WIRE 672 96 416 96
WIRE 1936 96 1936 -16
WIRE -1264 112 -1344 112
WIRE -1152 112 -1200 112
WIRE -1088 112 -1152 112
WIRE -976 112 -1024 112
WIRE -832 112 -832 48
WIRE -832 112 -896 112
WIRE -768 112 -832 112
WIRE 80 112 80 -48
WIRE 992 112 992 -176
WIRE 1104 128 1104 -336
WIRE 1200 128 1104 128
WIRE 1312 128 1312 -240
WIRE 1312 128 1200 128
WIRE -768 144 -816 144
WIRE -608 144 -608 -48
WIRE -608 144 -704 144
WIRE -1536 160 -1728 160
WIRE 1104 176 1104 128
WIRE -1152 192 -1152 112
WIRE -816 192 -816 144
WIRE -816 192 -1152 192
WIRE 640 192 640 -16
WIRE 640 192 416 192
WIRE 1184 224 1104 224
WIRE 992 256 992 112
WIRE 1056 256 992 256
WIRE -320 272 -320 -80
WIRE -176 272 -320 272
WIRE 224 288 224 240
WIRE -176 304 -320 304
WIRE -48 304 -112 304
WIRE 192 304 -48 304
WIRE 416 304 416 192
WIRE 496 304 416 304
WIRE 352 320 256 320
WIRE 496 320 352 320
WIRE 1312 320 1312 128
WIRE 80 336 80 192
WIRE 192 336 80 336
WIRE 672 336 672 96
WIRE 672 336 560 336
WIRE 720 336 672 336
WIRE 768 336 768 -144
WIRE 768 336 720 336
WIRE -832 352 -832 288
WIRE 224 400 224 352
WIRE 80 432 80 336
WIRE 1104 448 1104 272
WIRE 1312 448 1312 384
WIRE 1312 448 1104 448
WIRE -1536 480 -1536 160
WIRE -1312 480 -1536 480
WIRE -1152 480 -1312 480
WIRE -1088 480 -1152 480
WIRE -976 480 -1024 480
WIRE -832 480 -832 416
WIRE -832 480 -896 480
WIRE -768 480 -832 480
WIRE -768 512 -816 512
WIRE -608 512 -704 512
WIRE -2256 560 -2256 96
WIRE -1152 560 -1152 480
WIRE -816 560 -816 512
WIRE -816 560 -1152 560
WIRE 80 592 80 512
WIRE 1104 608 1104 448
WIRE -608 656 -608 512
WIRE -528 656 -608 656
WIRE -320 656 -320 304
WIRE -320 656 -464 656
WIRE 512 672 512 544
WIRE -528 688 -608 688
WIRE -2256 704 -2256 640
WIRE -832 720 -832 656
WIRE 512 816 512 752
WIRE -1264 848 -1344 848
WIRE -1152 848 -1200 848
WIRE -1088 848 -1152 848
WIRE -976 848 -1024 848
WIRE -832 848 -832 784
WIRE -832 848 -896 848
WIRE -768 848 -832 848
WIRE -768 880 -816 880
WIRE -608 880 -608 688
WIRE -608 880 -704 880
WIRE -1152 928 -1152 848
WIRE -816 928 -816 880
WIRE -816 928 -1152 928
FLAG 80 592 0
FLAG 224 48 0
FLAG 224 400 0
FLAG 1104 608 0
FLAG 512 816 0
FLAG 512 544 Vdd
FLAG -832 288 Vdd
FLAG -832 -80 Vdd
FLAG -832 -432 Vdd
FLAG -832 656 Vdd
FLAG 656 -480 Vdd
FLAG 80 -304 Vdd
FLAG 1104 -464 Vdd
FLAG 1184 224 0
FLAG 1936 96 0
FLAG 1584 -176 out
FLAG -1344 848 Q+
FLAG -1344 112 I+
FLAG -1152 112 I-
FLAG -1152 848 Q-
FLAG 224 -112 Vdd
FLAG 224 240 Vdd
FLAG -1296 -256 I+
FLAG -1312 480 Q+
FLAG -2256 704 0
FLAG -608 -224 ZD1
FLAG -608 144 ZD2
FLAG -608 512 ZD3
FLAG -608 880 ZD4
FLAG -320 -80 ZD12
FLAG -320 656 ZD34
FLAG 80 -48 wcu
FLAG 80 336 wcl
FLAG -48 304 out_zd
FLAG 352 -32 out_u2
FLAG 352 320 out_u1
FLAG 992 112 M1_g
FLAG 1200 128 M1_d
FLAG 640 -16 Q
FLAG 720 336 Q_bar
SYMBOL Digital\\inv -1088 416 R0
WINDOW 3 -49 -10 Left 2
SYMATTR InstName A1
SYMATTR Value tau=100p
SYMBOL res 96 96 M0
SYMATTR InstName R2
SYMATTR Value 100
SYMBOL res 96 -240 M0
SYMATTR InstName R1
SYMATTR Value 230
SYMBOL res 96 416 M0
SYMATTR InstName R3
SYMATTR Value 10
SYMBOL Digital\\or -144 224 R0
WINDOW 3 -70 130 Left 2
SYMATTR InstName A2
SYMATTR Value tau=100p
SYMBOL Digital\\or -496 608 R0
WINDOW 3 -53 136 Left 2
SYMATTR InstName A3
SYMATTR Value tau=100p
SYMBOL Digital\\or -736 432 R0
WINDOW 3 71 22 Left 2
SYMATTR InstName A5
SYMATTR Value tau=100p
SYMBOL res -880 464 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 1000
SYMBOL cap -816 352 M0
SYMATTR InstName C1
SYMATTR Value 50p
SYMBOL Digital\\inv -1088 784 R0
WINDOW 3 -201 -12 Left 2
SYMATTR InstName A4
SYMATTR Value tau=100p
SYMBOL Digital\\or -736 800 R0
WINDOW 3 -44 141 Left 2
SYMATTR InstName A6
SYMATTR Value tau=100p
SYMBOL res -880 832 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 1000
SYMBOL cap -816 720 M0
SYMATTR InstName C2
SYMATTR Value 50p
SYMBOL Digital\\inv -1088 -320 R0
WINDOW 3 -44 -3 Left 2
SYMATTR InstName A7
SYMATTR Value tau=100p
SYMBOL Digital\\or -496 -128 R0
WINDOW 3 -39 -20 Left 2
SYMATTR InstName A8
SYMATTR Value tau=100p
SYMBOL Digital\\or -736 -304 R0
WINDOW 3 48 27 Left 2
SYMATTR InstName A9
SYMATTR Value tau=100p
SYMBOL res -880 -272 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 1000
SYMBOL cap -816 -384 M0
SYMATTR InstName C3
SYMATTR Value 50p
SYMBOL Digital\\inv -1088 48 R0
WINDOW 3 -34 -7 Left 2
SYMATTR InstName A10
SYMATTR Value tau=100p
SYMBOL Digital\\or -736 64 R0
WINDOW 3 -19 141 Left 2
SYMATTR InstName A11
SYMATTR Value tau=100p
SYMBOL res -880 96 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 1000
SYMBOL cap -816 -16 M0
SYMATTR InstName C4
SYMATTR Value 50p
SYMBOL Digital\\or 528 -96 R0
WINDOW 3 -104 -27 Left 2
SYMATTR InstName A12
SYMATTR Value Td=1n tau=100p
SYMBOL Digital\\or 880 -224 R0
WINDOW 3 -104 119 Left 2
SYMATTR InstName A13
SYMATTR Value tau=100p
SYMBOL Digital\\or 528 256 R0
WINDOW 3 -93 123 Left 2
SYMATTR InstName A14
SYMATTR Value Td=1n tau=100p
SYMBOL res 608 -496 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R8
SYMATTR Value 10
SYMBOL nmos4 1056 176 R0
WINDOW 123 56 100 Left 2
SYMATTR Value2 l=0.18u w=1u
SYMATTR InstName M1
SYMATTR Value NM
SYMBOL res 1088 -432 R0
SYMATTR InstName R9
SYMATTR Value 1Meg
SYMBOL cap 1296 320 R0
SYMATTR InstName C6
SYMATTR Value 1p
SYMBOL Digital\\inv 1440 -240 R0
SYMATTR InstName A16
SYMBOL voltage 512 656 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 1V
SYMBOL res 1792 -192 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R10
SYMATTR Value 100
SYMBOL cap 1920 -80 R0
SYMATTR InstName C7
SYMATTR Value 1p
SYMBOL Digital\\inv -1264 48 R0
WINDOW 3 -46 117 Left 2
SYMATTR InstName A17
SYMATTR Value tau=100p
SYMBOL Digital\\inv -1264 784 R0
WINDOW 3 -262 108 Left 2
SYMATTR InstName A18
SYMATTR Value tau=100p
SYMBOL OpAmps\\UniversalOpamp2 224 -32 R0
SYMATTR InstName U2
SYMATTR Value2 Avol=1G GBW=500MEG Slew=500MEG
SYMBOL OpAmps\\UniversalOpamp2 224 320 R0
SYMATTR InstName U1
SYMATTR Value2 Avol=1G GBW=500MEG Slew=500MEG
SYMBOL SpecialFunctions\\modulate2 -1872 96 R0
WINDOW 3 -158 127 Left 2
WINDOW 123 -158 155 Left 2
SYMATTR Value MARK=2.185MEG SPACE=1.815MEG
SYMATTR Value2 vhigh=1 vlow=0
SYMATTR InstName A19
SYMBOL voltage -2256 544 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName Vfm
SYMATTR Value pulse 0 1 10n 10n 10n 2499.99n 5u
TEXT -2088 -416 Left 2 !.lib mosfet_018.lib
TEXT -2080 -360 Left 2 !.tran 3u
TEXT -272 -544 Center 2 ;This is not a working schematic yet\nStill under development
TEXT -2096 -528 Left 2 ;https://groups.io/g/LTspice/topic/a_gfsk_demodulator_for_low_if/80343092
[Transient Analysis]
{
Npanes: 14
Active Pane: 13
{
traces: 1 {524290,0,"V(i+)"}
X: ('µ',1,0,3e-007,3.00154535236943e-006)
Y[0]: (' ',1,0,0.1,1)
Y[1]: ('_',0,1e+308,0,-1e+308)
Volts: (' ',0,0,1,0,0.1,1)
Log: 0 0 0
},
{
traces: 1 {589830,0,"V(q+)"}
X: ('µ',1,0,3e-007,3.00154535236943e-006)
Y[0]: (' ',1,0,0.1,1)
Y[1]: ('_',0,1e+308,0,-1e+308)
Volts: (' ',0,0,1,0,0.1,1)
Log: 0 0 0
},
{
traces: 1 {589834,0,"V(out)"}
X: ('µ',1,0,3e-007,3.00154535236943e-006)
Y[0]: (' ',1,-0.1,0.1,1)
Y[1]: ('_',0,1e+308,0,-1e+308)
Volts: (' ',0,0,1,-0.1,0.1,1)
Log: 0 0 0
},
{
traces: 1 {524291,0,"V(i-)"}
X: ('µ',1,0,3e-007,3.00154535236943e-006)
Y[0]: (' ',1,-0.1,0.1,1.1)
Y[1]: ('_',0,1e+308,0,-1e+308)
Volts: (' ',0,0,1,-0.1,0.1,1.1)
Log: 0 0 0
},
{
traces: 1 {524292,0,"V(zd1)"}
X: ('µ',1,0,3e-007,3.00154535236943e-006)
Y[0]: (' ',1,-0.1,0.1,1.1)
Y[1]: ('_',0,1e+308,0,-1e+308)
Volts: (' ',0,0,1,-0.1,0.1,1.1)
Log: 0 0 0
},
{
traces: 1 {524293,0,"V(zd2)"}
X: ('µ',1,0,3e-007,3.00154535236943e-006)
Y[0]: (' ',1,-0.1,0.1,1.1)
Y[1]: ('_',0,1e+308,0,-1e+308)
Volts: (' ',0,0,1,-0.1,0.1,1.1)
Log: 0 0 0
},
{
traces: 1 {589837,0,"V(zd12)"}
X: ('µ',1,0,3e-007,3.00154535236943e-006)
Y[0]: (' ',1,-0.1,0.1,1.1)
Y[1]: ('_',0,1e+308,0,-1e+308)
Volts: (' ',0,0,1,-0.1,0.1,1.1)
Log: 0 0 0
},
{
traces: 1 {524295,0,"V(out_zd)"}
X: ('µ',1,0,3e-007,3.00154535236943e-006)
Y[0]: (' ',1,-0.1,0.1,1.1)
Y[1]: ('_',0,1e+308,0,-1e+308)
Volts: (' ',0,0,1,-0.1,0.1,1.1)
Log: 0 0 0
},
{
traces: 1 {524296,0,"V(out_u1)"}
X: ('µ',1,0,3e-007,3.00154535236943e-006)
Y[0]: (' ',1,0,0.1,1.1)
Y[1]: ('_',0,1e+308,0,-1e+308)
Volts: (' ',0,0,1,0,0.1,1.1)
Log: 0 0 0
},
{
traces: 1 {589830,0,"V(out_u2)"}
X: ('µ',1,0,3e-007,3.00154535236943e-006)
Y[0]: ('m',0,0,0.05,0.5)
Y[1]: ('_',0,1e+308,0,-1e+308)
Volts: ('m',0,0,0,0,0.05,0.5)
Log: 0 0 0
},
{
traces: 1 {589834,0,"V(m1_g)"}
X: ('µ',1,0,3e-007,3.00154535236943e-006)
Y[0]: (' ',1,0,0.1,1)
Y[1]: ('_',0,1e+308,0,-1e+308)
Volts: (' ',0,0,1,0,0.1,1)
Log: 0 0 0
},
{
traces: 1 {589828,0,"V(q_bar)"}
X: ('µ',1,0,3e-007,3.00154535236943e-006)
Y[0]: (' ',1,-0.1,0.1,1.1)
Y[1]: ('_',0,1e+308,0,-1e+308)
Volts: (' ',0,0,1,-0.1,0.1,1.1)
Log: 0 0 0
},
{
traces: 1 {589829,0,"V(q)"}
X: ('µ',1,0,3e-007,3.00154535236943e-006)
Y[0]: (' ',1,-0.1,0.1,1)
Y[1]: ('_',0,1e+308,0,-1e+308)
Volts: (' ',0,0,1,-0.1,0.1,1)
Log: 0 0 0
},
{
traces: 1 {589826,0,"V(m1_d)"}
X: ('µ',1,0,3e-007,3.00154535236943e-006)
Y[0]: ('m',1,0,0.0001,0.0012)
Y[1]: ('_',0,1e+308,0,-1e+308)
Volts: ('m',0,0,1,0,0.0001,0.0012)
Log: 0 0 0
}
}
* modified for use with LTSpice; DM 8/19/2008
*
* 0.18u CMOS process
*
* NMOS transistor model name: NM
* PMOS transistor model name: PM
*-----------------------------------------------------------------------
.subckt NM D G S B
+params: W=10u L=1u
M1 D G S B NM L={L} W={W} AS={1.1u*W} PS={2.2u+W} AD={1.1u*W} PD={2.2u+W}
.ends
* ----------------------------------------------------------------------
* NMOS transistor model
* ----------------------------------------------------------------------
.MODEL NM NMOS LEVEL=49
* ----------------------------------------------------------------------
************************* SIMULATION PARAMETERS ************************
* ----------------------------------------------------------------------
* format : LTspice
* model : MOS BSIM3v3
* ----------------------------------------------------------------------
* TYPICAL MEAN CONDITION
* ----------------------------------------------------------------------
+VERSION = 3.1 TNOM = 27 TOX = 4.1E-9
+XJ = 1E-7 NCH = 2.3549E17 VTH0 = 0.354505
+K1 = 0.5733393 K2 = 3.177172E-3 K3 = 27.3563303
+K3B = -10 W0 = 2.341477E-5 NLX = 1.906617E-7
+DVT0W = 0 DVT1W = 0 DVT2W = 0
+DVT0 = 1.6751718 DVT1 = 0.4282625 DVT2 = 0.036004
+U0 = 327.3736992 UA = -4.52726E-11 UB = 4.46532E-19
+UC = -4.74051E-11 VSAT = 8.785346E4 A0 = 1.6897405
+AGS = 0.2908676 B0 = -8.224961E-9 B1 = -1E-7
+KETA = 0.021238 A1 = 8.00349E-4 A2 = 1
+RDSW = 105 PRWG = 0.5 PRWB = -0.2
+WR = 1 WINT = 5e-9 LINT = 2.351737E-8
+DWG = 1.610448E-9
+DWB = -5.108595E-9 VOFF = -0.0652968 NFACTOR = 2.4901845
+CIT = 0 CDSC = 2.4E-4 CDSCD = 0
+CDSCB = 0 ETA0 = 0.0231564 ETAB = -0.058499
+DSUB = 0.9467118 PCLM = 0.8512348 PDIBLC1 = 0.0929526
+PDIBLC2 = 0.01 PDIBLCB = -0.1 DROUT = 0.5224026
+PSCBE1 = 7.979323E10 PSCBE2 = 1.522921E-9 PVAG = 0.01
+DELTA = 0.01 RSH = 6.8 MOBMOD = 1
+PRT = 0 UTE = -1.5 KT1 = -0.11
+KT1L = 0 KT2 = 0.022 UA1 = 4.31E-9
+UB1 = -7.61E-18 UC1 = -5.6E-11 AT = 3.3E4
+WL = 0 WLN = 1 WW = 0
+WWN = 1 WWL = 0 LL = 0
+LLN = 1 LW = 0 LWN = 1
+LWL = 0 CAPMOD = 2 XPART = 0.5
+CGDO = 7.7E-10 CGSO = 7.7E-10 CGBO = 1E-12
+CJ = 1.010083E-3 PB = 0.7344298 MJ = 0.3565066
+CJSW = 2.441707E-10 PBSW = 0.8005503 MJSW = 0.1327842
+CJSWG = 3.3E-10 PBSWG = 0.8005503 MJSWG = 0.1327842
+CF = 0 PVTH0 = 1.307195E-3 PRDSW = -5
+PK2 = -1.022757E-3 WKETA = -4.466285E-4 LKETA = -9.715157E-3
+PU0 = 12.2704847 PUA = 4.421816E-11 PUB = 0
+PVSAT = 1.707461E3 PETA0 = 1E-4 PKETA = 2.348777E-3
*-----------------------------------------------------------------------
.subckt PM D G S B
+params: W=10u L=1u
M1 D G S B PM L={L} W={W} AS={1.1u*W} PS={2.2u+W} AD={1.1u*W} PD={2.2u+W}
.ends
* ----------------------------------------------------------------------
* PMOS transistor model
* ----------------------------------------------------------------------
.MODEL PM PMOS LEVEL=49
* ----------------------------------------------------------------------
************************* SIMULATION PARAMETERS ************************
* ----------------------------------------------------------------------
* format : LTSPICE
* model : MOS BSIM3v3
* ----------------------------------------------------------------------
* TYPICAL MEAN CONDITION
* ----------------------------------------------------------------------
+VERSION = 3.1 TNOM = 27 TOX = 4.1E-9
+XJ = 1E-7 NCH = 4.1589E17 VTH0 = -0.4120614
+K1 = 0.5590154 K2 = 0.0353896 K3 = 0
+K3B = 7.3774572 W0 = 1E-6 NLX = 1.103367E-7
+DVT0W = 0 DVT1W = 0 DVT2W = 0
+DVT0 = 0.4301522 DVT1 = 0.2156888 DVT2 = 0.1
+U0 = 128.7704538 UA = 1.908676E-9 UB = 1.686179E-21
+UC = -9.31329E-11 VSAT = 1.658944E5 A0 = 1.6076505
+AGS = 0.3740519 B0 = 1.711294E-6 B1 = 4.946873E-6
+KETA = 0.0210951 A1 = 0.0244939 A2 = 1
+RDSW = 127.0442882 PRWG = 0.5 PRWB = -0.5
+WR = 1 WINT = 5.928484E-10 LINT = 3.468805E-8
+DWG = -2.453074E-8
+DWB = 6.408778E-9 VOFF = -0.0974174 NFACTOR = 1.9740447
+CIT = 0 CDSC = 2.4E-4 CDSCD = 0
+CDSCB = 0 ETA0 = 0.1847491 ETAB = -0.2531172
+DSUB = 1.5 PCLM = 4.8842961 PDIBLC1 = 0.0156227
+PDIBLC2 = 0.1 PDIBLCB = -1E-3 DROUT = 0
+PSCBE1 = 1.733878E9 PSCBE2 = 5.002842E-10 PVAG = 15
+DELTA = 0.01 RSH = 7.7 MOBMOD = 1
+PRT = 0 UTE = -1.5 KT1 = -0.11
+KT1L = 0 KT2 = 0.022 UA1 = 4.31E-9
+UB1 = -7.61E-18 UC1 = -5.6E-11 AT = 3.3E4
+WL = 0 WLN = 1 WW = 0
+WWN = 1 WWL = 0 LL = 0
+LLN = 1 LW = 0 LWN = 1
+LWL = 0 CAPMOD = 2 XPART = 0.5
+CGDO = 7.11E-10 CGSO = 7.11E-10 CGBO = 1E-12
+CJ = 1.179334E-3 PB = 0.8545261 MJ = 0.4117753
+CJSW = 2.215877E-10 PBSW = 0.6162997 MJSW = 0.2678074
+CJSWG = 4.22E-10 PBSWG = 0.6162997 MJSWG = 0.2678074
+CF = 0 PVTH0 = 2.283319E-3 PRDSW = 5.6431992
+PK2 = 2.813503E-3 WKETA = 2.438158E-3 LKETA = -0.0116078
+PU0 = -2.2514581 PUA = -7.62392E-11 PUB = 4.502298E-24
+PVSAT = -50 PETA0 = 1E-4 PKETA = -1.047892E-4
* ----------------------------------------------------------------------
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