Pulse transistion time

[Kevin Weddle]

A circuit based on a 1KHz clock has a longer pulse transistion time than a 10Khz clock. But couldn't it have the same transistion time? Is there a circuit to reduce pulse transistion time and make a low frequency digital circuit perform better?

 

[audioguru2]

Use a logic inverter, gate or counter that has a Schmitt-trigger input.

A CD4017 decade counter made by Texas Instruments has a clock input that has a Schmitt-trigger. Its clock rise and fall times are allowed to be unlimited.

 

[Kevin Weddle]

Thank you audioguru. Although Schmitt triggered digital devices seem more reliable, isn't it a form of positive feedback that prevents noise from switching the device?

 

[audioguru2]

A Schmitt trigger has an upper trigger voltage and a lower trigger voltage caused by positive feedback. Voltages from noise that are in between do not have any affect.