Version 4
SHEET 1 952 1188
WIRE -512 -32 -512 -64
WIRE -512 80 -512 48
WIRE -512 256 -512 224
WIRE -512 368 -512 336
WIRE -432 224 -512 224
WIRE -368 -112 -416 -112
WIRE -368 -64 -512 -64
WIRE -368 -64 -368 -112
WIRE -240 -64 -368 -64
WIRE -240 128 -240 -64
WIRE -192 224 -432 224
WIRE -192 224 -192 0
WIRE -144 -64 -240 -64
WIRE -144 0 -192 0
WIRE -144 128 -240 128
WIRE -144 224 -192 224
WIRE 96 -16 32 -16
WIRE 96 176 32 176
FLAG -512 80 0
FLAG -512 368 0
FLAG -432 224 c1
FLAG -416 -112 in
IOPIN -416 -112 In
FLAG 96 -16 out
IOPIN 96 -16 Out
FLAG 96 176 out2
IOPIN 96 176 Out
SYMBOL voltage -512 -48 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value SINE(0 1 50)
SYMBOL voltage -512 240 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value PULSE(0 1 0 {TT} {TT} {Ts/2} {Ts})
SYMBOL sample -64 -32 R0
SYMATTR InstName A1
SYMBOL sample -64 160 R0
SYMATTR InstName A2
TEXT -728 -320 Left 0 !.options plotwinsize=0
TEXT -728 -504 Left 0 !.param Ts=1m
TEXT -552 -504 Left 0 ;<- enter sampling period
TEXT -240 -560 Left 0 ;Zero-Order Hold\nUsing the non documented A-device SMAPLEHOLD.\n \nTwo ways to use the A-device SAMPLEHOLD:\n1. Put an edge on the CLK pin. It samples at the clk rising edge.\n2. Put a level on the S/H pin. It follows while high, holds when low.\n \n3.The important parameter is the rise and fall time Ts*1e-6.\n   I's also named the transition time TT in this example.\n   This gives high precision at fastest simulation speed.
TEXT -728 -400 Left 0 ;.options trtol=1e-4 ;does the job
TEXT -728 -552 Left 0 !.tran 0 20m 0
TEXT 64 -48 Left 0 ;Zero-order hold
TEXT 56 136 Left 0 ;Track and hold
TEXT -728 -360 Left 0 ;.options reltol=1E-7 ;works too
TEXT -728 -456 Left 0 !.param TT=if((Ts*1e-6)<1p, 1p, {Ts*1e-6})