* SPICE netlist
JQ1 N012 +Vi N015 J2SK389BL
JQ2 N013 -Vi N018 J2SK389BL
R1 N022 N015 200
R2 N018 N022 200
D1 N001 N012 1N914
D2 N004 N013 1N914
Q3 A N008 N001 0 2N5401
Q4 B N008 N004 0 2N5401
XU1 +Vo N002 N005 N009 6CA7 ;pnba Anode)Screen)Grid)Cathode
I1 0 N001 TBL(-15 0 -14 2m)
V3 N008 0 10 Rser=2k5
I2 0 N004 TBL(-15 0 -14 2m)
XU2 -Vo N003 N006 N011 6CA7 ;pnba Anode)Screen)Grid)Cathode
R3 +Vo N015 200k
R4 -Vo N018 200k
C1 0 +Vo {150p+20p}
C2 0 -Vo {150p+20p}
R5 N019 A .50k
R6 B N020 .50k
R7 N019 N021 200k
R8 N021 N020 200k
R9 -Vb N024 100
R10 N021 -Vb 6k8
R11 N025 -Vb 100
R12 N002 +Vo 470
R13 N005 -Vb 100
R14 N009 N010 10k
R15 N023 -Vb 410
R16 -Vb N006 100
R17 N010 N011 10k
R18 -Vo N003 470
I3 N022 0 TBL(-15 0 -14 3m3)
I4 0 +Vo TBL(-398 0 -397 28m)
I5 0 N016 TBL(300 0 301 11m)
I6 0 N017 TBL(300 0 301 11m)
I7 0 -Vo TBL(-398 0 -397 28m)
Q5 N019 N021 N024 0 2N3904
Q6 N020 N021 N025 0 2N3904
V4 N010 -Vb 100 Rser=1 Cpar=1n
MQ7 -Vb N016 N009 N009 Si9407AEY m=.10
MQ8 N016 N019 N023 N023 Si9420DY m=.15
MQ9 N017 N020 N023 N023 Si9420DY m=.15
MQ10 -Vb N017 N011 N011 Si9407AEY m=.10
V5 0 -Vb 400 Rser=1
Bf2 f 0 V={f2/f1}**(time/Ts-1)
A2 f 0 0 0 0 0 N007 0 MODULATOR space=0 mark={f2} Vhigh={Vdc+Vp} Vlow={Vdc-Vp}
R19 +Vi N007 600
E1 0 N014 N007 0 1
R20 -Vi N014 600
+ Rd=4.95 Rs=4.45 Is=6f32 Pb=1 Fc=.5 Cgs=71p2 Cgd=18p9)
.subckt 6CA7 A S G K
Bat at 0 V=636m*atan(V(A,K)/23)
Bgs gs 0 V=Uramp(V(S,K)/9.3+V(G,K)*0.95)
Bgs2 gs2 0 V=V(gs)**1.5
Bcath cc 0 V=V(gs2)*V(at)
Ba A K I=1m86*V(cc)
Bscrn sc 0 V=V(gs2)*(1.1-V(at))
Bs S K I=1m518*V(sc)
Bg G K I=(Uramp(V(G,K)+1)**1.5)*50u
Cg1 G K 15.4p
Cak A K 8.4p
Cg1a G A 1.1p
.options plotwinsize=0
.tran 0 {Ts} 10u uic
.param Vdc=0 Vp=10m f1=2k f2=200k Ts=4m

* LTspice schematic (.asc)
Version 4
SHEET 1 1872 864
WIRE -936 -144 -936 -176
WIRE -936 -32 -936 -64
WIRE -904 -176 -936 -176
WIRE -872 -176 -904 -176
WIRE -712 -144 -728 -144
WIRE -712 -64 -712 -144
WIRE -712 64 -712 16
WIRE -696 -144 -712 -144
WIRE -696 -64 -712 -64
WIRE -696 -16 -712 -16
WIRE -696 64 -712 64
WIRE -648 16 -712 16
WIRE -648 16 -648 0
WIRE -600 -144 -616 -144
WIRE -600 64 -616 64
WIRE -440 0 -488 0
WIRE -392 -368 -392 -384
WIRE -392 -272 -392 -288
WIRE -392 -160 -392 -272
WIRE -392 -64 -392 -96
WIRE -392 48 -392 32
WIRE -392 144 -392 48
WIRE -392 240 -392 224
WIRE -360 -80 -488 -80
WIRE -360 0 -360 -80
WIRE -328 240 -392 240
WIRE -328 256 -328 240
WIRE -328 352 -328 336
WIRE -312 0 -360 0
WIRE -264 -368 -264 -384
WIRE -264 -192 -264 -288
WIRE -264 -160 -264 -192
WIRE -264 -64 -264 -96
WIRE -264 128 -264 32
WIRE -264 144 -264 128
WIRE -264 240 -328 240
WIRE -264 240 -264 224
WIRE -232 -272 -392 -272
WIRE -232 -192 -264 -192
WIRE -216 48 -392 48
WIRE -216 128 -264 128
WIRE -184 -128 -184 -208
WIRE -184 -112 -184 -128
WIRE -184 -16 -184 -32
WIRE -120 48 -136 48
WIRE -120 128 -136 128
WIRE -104 -272 -136 -272
WIRE -104 -192 -136 -192
WIRE 104 16 104 -32
WIRE 104 128 104 96
WIRE 104 192 104 128
WIRE 104 224 104 192
WIRE 104 336 104 320
WIRE 104 432 104 416
WIRE 120 192 104 192
WIRE 216 192 200 192
WIRE 216 272 168 272
WIRE 216 272 216 192
WIRE 216 336 216 272
WIRE 216 432 104 432
WIRE 216 432 216 416
WIRE 232 192 216 192
WIRE 264 272 216 272
WIRE 328 16 328 -32
WIRE 328 160 328 96
WIRE 328 192 312 192
WIRE 328 192 328 160
WIRE 328 224 328 192
WIRE 328 336 328 320
WIRE 328 432 216 432
WIRE 328 432 328 416
WIRE 392 -416 392 -432
WIRE 392 -320 392 -352
WIRE 392 -304 392 -320
WIRE 392 -208 392 -224
WIRE 392 160 328 160
WIRE 392 320 392 160
WIRE 424 -208 392 -208
WIRE 424 128 104 128
WIRE 424 272 424 128
WIRE 472 -416 472 -432
WIRE 472 -320 392 -320
WIRE 472 -320 472 -336
WIRE 472 -256 472 -320
WIRE 504 -320 472 -320
WIRE 504 -80 504 -144
WIRE 504 96 504 -80
WIRE 504 432 328 432
WIRE 504 432 504 192
WIRE 536 -192 520 -192
WIRE 536 -80 504 -80
WIRE 536 272 424 272
WIRE 584 16 584 0
WIRE 584 112 552 112
WIRE 584 112 584 96
WIRE 584 192 584 112
WIRE 616 432 504 432
WIRE 632 -192 616 -192
WIRE 664 -192 632 -192
WIRE 664 -176 664 -192
WIRE 664 -80 616 -80
WIRE 664 -80 664 -96
WIRE 664 288 584 288
WIRE 664 336 664 288
WIRE 664 432 616 432
WIRE 664 432 664 416
WIRE 712 -192 664 -192
WIRE 712 -80 664 -80
WIRE 744 16 744 0
WIRE 744 112 744 96
WIRE 744 192 744 112
WIRE 744 288 664 288
WIRE 776 112 744 112
WIRE 792 320 392 320
WIRE 792 320 792 272
WIRE 808 -192 792 -192
WIRE 824 -80 792 -80
WIRE 824 -80 824 -144
WIRE 824 96 824 -80
WIRE 824 432 664 432
WIRE 824 432 824 192
WIRE 856 -416 856 -432
WIRE 856 -320 824 -320
WIRE 856 -320 856 -336
WIRE 856 -256 856 -320
WIRE 936 -416 936 -432
WIRE 936 -320 856 -320
WIRE 936 -320 936 -352
WIRE 936 -304 936 -320
WIRE 936 -208 904 -208
WIRE 936 -208 936 -224
WIRE 936 336 936 320
WIRE 936 432 824 432
WIRE 936 432 936 416
FLAG -184 -16 0
FLAG 936 320 0
FLAG 616 432 -Vb
FLAG 504 -320 +Vo
IOPIN 752 -128 Out
FLAG -120 48 +Vo
IOPIN 128 240 In
FLAG -120 128 -Vo
IOPIN 128 320 In
FLAG -488 -80 -Vi
IOPIN -240 112 In
FLAG -600 64 -Vi
IOPIN -352 256 Out
FLAG -600 -144 +Vi
IOPIN -352 48 Out
FLAG -488 0 +Vi
IOPIN -240 192 In
FLAG -328 352 0
FLAG -392 -384 0
FLAG -264 -384 0
FLAG -104 -272 A
IOPIN 144 -80 Out
FLAG 104 -32 A
IOPIN 352 160 In
FLAG -104 -192 B
IOPIN 144 0 Out
FLAG 328 -32 B
IOPIN 576 160 In
FLAG 632 -192 -Vb
FLAG 472 -432 0
FLAG 584 0 0
FLAG 744 0 0
FLAG 824 -320 -Vo
IOPIN 1072 -128 Out
FLAG 856 -432 0
FLAG 392 -432 0
FLAG 936 -432 0
FLAG -904 -176 f
FLAG -936 -32 0
FLAG -712 -16 0
FLAG -648 -80 0
SYMBOL njf -440 -64 R0
SYMATTR Value J2SK389BL
SYMATTR InstName Q1
SYMBOL njf -312 -64 R0
SYMATTR Value J2SK389BL
SYMATTR InstName Q2
SYMBOL res -376 240 R180
SYMATTR InstName R1
SYMATTR Value 200
SYMBOL res -280 128 R0
SYMATTR InstName R2
SYMATTR Value 200
SYMBOL diode -376 -160 M0
SYMATTR InstName D1
SYMATTR Value 1N914
SYMBOL diode -248 -160 M0
SYMATTR InstName D2
SYMATTR Value 1N914
SYMBOL pnp -136 -208 M270
SYMATTR InstName Q3
SYMATTR Value 2N5401
SYMBOL pnp -136 -128 M270
SYMATTR InstName Q4
SYMATTR Value 2N5401
SYMBOL Misc\\tetrode 472 -208 M0
SYMATTR Value 6CA7
SYMATTR InstName U1
SYMBOL current -392 -368 M0
SYMATTR InstName I1
SYMATTR Value TBL(-15 0 -14 2m)
SYMBOL voltage -184 -128 R0
SYMATTR InstName V3
SYMATTR Value 10
SYMATTR SpiceLine Rser=2k5
SYMBOL current -264 -368 R0
SYMATTR InstName I2
SYMATTR Value TBL(-15 0 -14 2m)
SYMBOL Misc\\tetrode 856 -208 R0
SYMATTR Value 6CA7
SYMATTR InstName U2
SYMBOL res -120 32 R90
SYMATTR InstName R3
SYMATTR Value 200k
SYMBOL res -120 112 R90
SYMATTR InstName R4
SYMATTR Value 200k
SYMBOL cap 408 -416 M0
SYMATTR InstName C1
SYMATTR Value {150p+20p}
SYMBOL cap 920 -416 R0
SYMATTR InstName C2
SYMATTR Value {150p+20p}
SYMBOL res 120 112 R180
SYMATTR InstName R5
SYMATTR Value .50k
SYMBOL res 312 0 R0
SYMATTR InstName R6
SYMATTR Value .50k
SYMBOL res 104 208 R270
SYMATTR InstName R7
SYMATTR Value 200k
SYMBOL res 216 208 R270
SYMATTR InstName R8
SYMATTR Value 200k
SYMBOL res 120 432 R180
SYMATTR InstName R9
SYMATTR Value 100
SYMBOL res 200 320 R0
SYMATTR InstName R10
SYMATTR Value 6k8
SYMBOL res 312 320 R0
SYMATTR InstName R11
SYMATTR Value 100
SYMBOL res 408 -208 R180
SYMATTR InstName R12
SYMATTR Value 470
SYMBOL res 520 -176 R270
SYMATTR InstName R13
SYMATTR Value 100
SYMBOL res 520 -64 R270
SYMATTR InstName R14
SYMATTR Value 10k
SYMBOL res 648 320 R0
SYMATTR InstName R15
SYMATTR Value 410
SYMBOL res 696 -176 R270
SYMATTR InstName R16
SYMATTR Value 100
SYMBOL res 696 -64 R270
SYMATTR InstName R17
SYMATTR Value 10k
SYMBOL res 920 -320 R0
SYMATTR InstName R18
SYMATTR Value 470
SYMBOL current -328 256 M0
SYMATTR InstName I3
SYMATTR Value TBL(-15 0 -14 3m3)
SYMBOL current 472 -416 R0
SYMATTR InstName I4
SYMATTR Value TBL(-398 0 -397 28m)
SYMBOL current 584 16 M0
SYMATTR InstName I5
SYMATTR Value TBL(300 0 301 11m)
SYMBOL current 744 16 R0
SYMATTR InstName I6
SYMATTR Value TBL(300 0 301 11m)
SYMBOL current 856 -416 M0
SYMATTR InstName I7
SYMATTR Value TBL(-398 0 -397 28m)
SYMBOL npn 168 224 M0
SYMATTR InstName Q5
SYMATTR Value 2N3904
SYMBOL npn 264 224 R0
SYMATTR InstName Q6
SYMATTR Value 2N3904
SYMBOL voltage 664 -80 M180
SYMATTR InstName V4
SYMATTR Value 100
SYMATTR SpiceLine Rser=1 Cpar=1n
SYMBOL pmos 552 192 R180
SYMATTR Value Si9407AEY
SYMATTR Value2 m=.10
SYMATTR InstName Q7
SYMBOL nmos 536 192 R0
SYMATTR InstName Q8
SYMATTR Value Si9420DY
SYMATTR Value2 m=.15
SYMBOL nmos 792 192 M0
SYMATTR InstName Q9
SYMATTR Value Si9420DY
SYMATTR Value2 m=.15
SYMBOL pmos 776 192 M180
SYMATTR Value2 m=.10
SYMATTR InstName Q10
SYMATTR Value Si9407AEY
SYMBOL voltage 936 320 M0
SYMATTR SpiceLine Rser=1
SYMATTR InstName V5
SYMATTR Value 400
SYMBOL bv -936 -160 R0
SYMATTR Value V={f2/f1}**(time/Ts-1)
SYMATTR InstName Bf2
SYMBOL SpecialFunctions\\modulate -872 -176 R0
SYMATTR Value space=0 mark={f2}
SYMATTR Value2 Vhigh={Vdc+Vp}
SYMATTR SpiceLine Vlow={Vdc-Vp}
SYMATTR InstName A2
SYMBOL res -600 -160 R90
SYMATTR InstName R19
SYMATTR Value 600
SYMBOL e -648 -96 R0
SYMATTR InstName E1
SYMATTR Value 1
SYMBOL res -600 48 R90
SYMATTR InstName R20
SYMATTR Value 600