Porbably overkill for what you want to do but one device I remember reading
about that does this sort of thing is a "bucket brigade" device. It is used
in audio to create echos. TTYL


> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of D. Schouten
> Sent: Wednesday, August 29, 2001 13:02
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [EE]: Creating 1us pulse delay in hardware
>
>
> Hi All,
>
> I was wondering if some of you guys happen to know a simple circuit to
> create a 1us (approx.) delay for a 20kHz PWM signal coming out of a
> PIC. I need this to create a death-time in order to avoid current
> shoot through in an H-bridge.
>
> The circuit I have right now consists of a small RC to slow down the
> ramps of the pulse, followed by a comparator with significant
> hysteresis. The comparator hysteresis is set at 1/3 and 2/3 of vdd.
> This circuit seems to work ok, but I was wondering if there were other
> options too. Or is my current approach not so bad after all?
>
> Thanks!
>
> Daniel...
>
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