Version 4 SHEET 1 880 680 WIRE -672 -1232 -688 -1232 WIRE -512 -1232 -528 -1232 WIRE -1952 -1216 -2000 -1216 WIRE -1824 -1216 -1872 -1216 WIRE -1296 -1216 -1344 -1216 WIRE -1168 -1216 -1216 -1216 WIRE -672 -1200 -672 -1232 WIRE -512 -1200 -512 -1232 WIRE -1824 -1168 -1824 -1216 WIRE -1168 -1168 -1168 -1216 WIRE -672 -1088 -672 -1120 WIRE -512 -1088 -512 -1120 WIRE -1824 -1008 -1824 -1088 WIRE -1760 -1008 -1824 -1008 WIRE -1648 -1008 -1760 -1008 WIRE -1520 -1008 -1584 -1008 WIRE -1168 -1008 -1168 -1088 WIRE -1104 -1008 -1168 -1008 WIRE -992 -1008 -1104 -1008 WIRE -864 -1008 -928 -1008 WIRE -1520 -960 -1520 -1008 WIRE -1168 -960 -1168 -1008 WIRE -864 -960 -864 -1008 WIRE -1216 -880 -1248 -880 WIRE -1520 -848 -1520 -880 WIRE -864 -848 -864 -880 WIRE -1312 -832 -1424 -832 WIRE -1168 -832 -1168 -864 WIRE -1168 -832 -1312 -832 WIRE -1424 -784 -1424 -832 WIRE -1824 -688 -1824 -1008 WIRE -1168 -688 -1168 -832 WIRE -1424 -672 -1424 -704 WIRE -2000 -608 -2096 -608 WIRE -1872 -608 -1920 -608 WIRE -1344 -608 -1440 -608 WIRE -1216 -608 -1264 -608 WIRE -2096 -592 -2096 -608 WIRE -1824 -560 -1824 -592 WIRE -1168 -560 -1168 -592 WIRE -2096 -496 -2096 -512 FLAG -672 -1088 0 FLAG -512 -1088 0 FLAG -688 -1232 VDD FLAG -528 -1232 Vb FLAG -1424 -672 0 FLAG -1248 -880 Vb FLAG -1168 -560 0 FLAG -1344 -1216 VDD FLAG -1104 -1008 outC FLAG -864 -848 0 FLAG -1824 -560 0 FLAG -2000 -1216 VDD FLAG -2096 -496 0 FLAG -1760 -1008 out FLAG -1520 -848 0 FLAG -1520 -1008 pulse FLAG -864 -1008 pulseC FLAG -1440 -608 drive FLAG -2096 -608 drive FLAG -1312 -832 casc SYMBOL voltage -672 -1216 R0 SYMATTR InstName V1 SYMATTR Value 6 SYMBOL voltage -512 -1216 R0 SYMATTR InstName V2 SYMATTR Value {Vb} SYMBOL mesfet -1216 -960 R0 SYMATTR InstName Q2 SYMATTR Value SAV551_chip SYMBOL res -1440 -800 R0 SYMATTR InstName R1 SYMATTR Value 1k SYMBOL res -1184 -1184 R0 SYMATTR InstName R2 SYMATTR Value 360 SYMBOL res -1248 -624 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 50 SYMBOL mesfet -1216 -688 R0 SYMATTR InstName Q1 SYMATTR Value SAV551_chip SYMBOL ind -1312 -1200 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L1 SYMATTR Value 15n SYMBOL res -880 -976 R0 SYMATTR InstName R4 SYMATTR Value 50 SYMBOL cap -928 -1024 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C1 SYMATTR Value 4.7n SYMBOL res -1840 -1184 R0 SYMATTR InstName R6 SYMATTR Value 360 SYMBOL voltage -2096 -608 R0 WINDOW 3 53 89 Left 2 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V4 SYMATTR Value PULSE(0. 0.7 1n 50p 50p 5n 10n) SYMBOL res -1904 -624 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R7 SYMATTR Value 50 SYMBOL mesfet -1872 -688 R0 SYMATTR InstName Q4 SYMATTR Value SAV551_chip SYMBOL ind -1968 -1200 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L2 SYMATTR Value 15n SYMBOL res -1536 -976 R0 SYMATTR InstName R8 SYMATTR Value 50 SYMBOL cap -1584 -1024 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C2 SYMATTR Value 4.7n TEXT -256 -1048 Left 2 !; MODELS\n* This is the datasheet model, except that LTspice doesn't understand a bunch of\n* the parameters given by Avago--we'll see if it works\n \n*.MODEL ATF38143_chip NMF( vto=-0.75, Beta=0.3, Lambda=0.07, Alpha=4,\n*+ B=0.8, Pb=0.7, Cgs=0.997E-12,\n*+ Cgd=0.176E-12, Rd=0.084, Rs=0.054, Kf=1e6, Af=1)\n \n* PH 2/10/20: Turns out that Avago's flicker noise amplitude Kf is 18 orders of\n* magnitude too high--they had 1E6 and it's more like 5E-12 for a 10 MHz\n* 1/f corner frequency. Hacked it to be 1/f (AF=2) and adjusted KF for a\n* 24-MHz 1/f corner, which should be roughtly right.\n \n.MODEL ATF38143_chip NMF( vto=-0.75, Beta=0.3, Lambda=0.07, Alpha=4,\n+ B=0.8, Pb=0.7, Cgs=0.997E-12,\n+ Cgd=0.176E-12, Rd=0.084, Rs=0.054, Kf=5e-11, Af=2)\n \n* Fixed to be enhancement\n.MODEL SAV551_chip AKO:ATF38143_chip VTO=0.08 TEXT -248 -1144 Left 2 !; SIMULATION COMMAND\n.tran 12n TEXT -240 -1264 Left 2 !; PARAMETERS\n.param Vb 1\n.step param Vb .5 .7 .1 TEXT -720 -1008 Left 2 ;Saturating Cascode Test\n \nPH after JL\nJune 29,2021