Electronics > Beginners
Pulsegenerator 1-5ns and 1V at 50Ohm
MasterT:
Use analog switch lvc4066, easy to set voltage at one side 0-5V and get sharp pulse at the other end. No need to worry about logic level conversion like for logic chips.
Gyro:
--- Quote from: MasterT on February 20, 2020, 06:50:26 pm ---Use analog switch lvc4066, easy to set voltage at one side 0-5V and get sharp pulse at the other end. No need to worry about logic level conversion like for logic chips.
--- End quote ---
Note that the turn-on and turn-off times are very slow compared to 74LVC typical logic speeds (up to 20/34ns, even at VCC of 6V, and slower at lower supplies)... https://assets.nexperia.com/documents/data-sheet/74LV4066.pdf
A transmission gate is a nice idea in other respects though.
MasterT:
--- Quote from: Gyro on February 20, 2020, 07:02:40 pm ---
--- Quote from: MasterT on February 20, 2020, 06:50:26 pm ---Use analog switch lvc4066, easy to set voltage at one side 0-5V and get sharp pulse at the other end. No need to worry about logic level conversion like for logic chips.
--- End quote ---
Note that the turn-on and turn-off times are very slow compared to 74LVC typical logic speeds (up to 20/34ns, even at VCC of 6V, and slower at lower supplies)... https://assets.nexperia.com/documents/data-sheet/74LV4066.pdf
A transmission gate is a nice idea in other respects though.
--- End quote ---
? Page 12: https://assets.nexperia.com/documents/data-sheet/74LVC4066.pdf
Rise time < 2nsec at 30pF load. There are 4 switches, sure timing gonna be faster using 2-4 in parallel.
Gyro:
Oops, I didn't notice that my LVC search had pulled up a 74LV4066 datasheet hit first :palm:. You're quite correct.
The figures on page 12 actually relate to input-output risetime (switch is already enabled), but the enable /disable times are similarly fast at 1.9/2.5ns typ. (Table 8 and Fig 16) as long as the VCC is kept up at ~5V... I'm assuming that your intention was to tie the inputs to a well decoupled 1V DC rail and switch the enable pins to create the pulse timing.
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