I want to make a narrow pulse. This will drive an e/o modulator to be an optical "fiducial" marker in a laser system.
I can use a Leo Bodnar style laser driver chip to make a fast edge, but I don't know if the chip will propagate a 100 ps wide pulse.
If it won't, maybe I can feed it a step and clip the output with a shorted transmission line. Making a 16.66 ohm line is a bit clumsy on a PC board... it's pretty fat.
Version 4 SHEET 1 880 680 WIRE 96 128 -16 128 WIRE 320 128 176 128 WIRE 448 128 320 128 WIRE -16 176 -16 128 WIRE 288 176 256 176 WIRE 448 176 448 128 WIRE 288 208 288 176 WIRE 320 208 320 128 WIRE -16 288 -16 256 WIRE 256 320 256 176 WIRE 288 320 288 304 WIRE 288 320 256 320 WIRE 320 320 320 304 WIRE 320 320 288 320 WIRE 448 320 448 256 WIRE 256 352 256 320 FLAG 256 352 0 FLAG -16 288 0 FLAG 448 320 0 SYMBOL res 192 112 R90 WINDOW 0 70 59 VBottom 2 WINDOW 3 75 60 VTop 2 SYMATTR InstName Rd SYMATTR Value 25 SYMBOL voltage -16 160 R0 WINDOW 0 -65 130 Left 2 WINDOW 3 -95 171 Left 2 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName Vd SYMATTR Value PULSE(0 1 100p 25p 25p 1) SYMBOL tline 304 256 R90 WINDOW 0 -39 90 VTop 2 WINDOW 3 24 155 VBottom 2 SYMATTR InstName T1 SYMATTR Value Td=50p Z0=16.7 SYMBOL res 432 160 R0 WINDOW 0 -56 51 Left 2 WINDOW 3 -54 80 Left 2 SYMATTR InstName R2 SYMATTR Value 50 TEXT -224 272 Left 2 !.tran 1n TEXT -264 144 Left 2 ;Shorted Txline TEXT -288 176 Left 2 ;Fiducial Generator TEXT -272 224 Left 2 ;JL May 16 2021