Version 4
SHEET 1 880 680
WIRE -48 -288 -192 -288
WIRE -48 -272 -48 -288
WIRE -192 -240 -192 -288
WIRE -176 -240 -192 -240
WIRE -240 -224 -272 -224
WIRE -176 -192 -176 -240
WIRE -176 -192 -192 -192
WIRE -48 -176 -48 -192
WIRE -272 -128 -272 -224
WIRE -272 -128 -320 -128
WIRE -192 -128 -192 -144
WIRE -80 -128 -192 -128
WIRE -192 -112 -192 -128
WIRE -176 -64 -192 -64
WIRE -272 -32 -272 -128
WIRE -240 -32 -272 -32
WIRE -176 -16 -176 -64
WIRE -176 -16 -192 -16
WIRE -192 0 -192 -16
WIRE -320 80 -320 -128
WIRE -240 80 -320 80
WIRE -80 80 -80 -128
WIRE -80 80 -160 80
WIRE -80 112 -80 80
WIRE -320 224 -320 80
WIRE -240 224 -320 224
WIRE -80 224 -80 192
WIRE -80 224 -176 224
WIRE -320 272 -320 224
WIRE -80 272 -80 224
WIRE -320 368 -320 336
WIRE -208 368 -320 368
WIRE -80 368 -80 336
WIRE -80 368 -208 368
WIRE -208 400 -208 368
FLAG -208 400 0
FLAG -192 0 0
FLAG -48 -176 0
SYMBOL Misc\\xtal -176 208 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName C1
SYMATTR Value {C}
SYMATTR SpiceLine Rser=50k Lser={L} Rpar=1e20 Cpar=1.35p
SYMBOL cap -336 272 R0
WINDOW 3 34 41 Left 0
SYMATTR Value 22p
SYMATTR InstName C2
SYMBOL cap -96 272 R0
SYMATTR InstName C3
SYMATTR Value 22p
SYMBOL res -96 96 R0
WINDOW 3 36 68 Left 0
SYMATTR Value 220k
SYMATTR InstName R1
SYMBOL res -144 64 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R2
SYMATTR Value 10meg
SYMBOL voltage -48 -288 R0
SYMATTR InstName V1
SYMATTR Value 3.3
SYMBOL pmos -240 -144 M180
WINDOW 3 69 67 Left 0
SYMATTR Value PMOS1
SYMATTR InstName M1
SYMBOL nmos -240 -112 R0
WINDOW 3 70 73 Left 0
SYMATTR Value NMOS1
SYMATTR InstName M2
TEXT 64 -184 Left 0 !.param R=50k f0=32768 Q=70000\n.param w=2*pi*f0\n.param C = 1/(w*Q*R)\n.param L = C*(Q*R)**2
TEXT 56 64 Left 0 !.tran 0 2 0 1u startup uic
TEXT 64 -64 Left 0 !.model NMOS1 NMOS(Kp=1m Vto=-0.5)
TEXT 64 -32 Left 0 !.model PMOS1 PMOS(Kp=2m Vto=-0.5)