555 Timer Astable Mode

157

04:54:10

Generate 10 GHz square wave. (In Theory)

published 11 years ago

rinks

11 years ago

555 timers max out at 1MHz (500kHz if you want temperature stability)

rinks

11 years ago

10GHz square(ish) wave is achievable with a crystal and VERY high speed logic

ZyanWu

11 years ago

He said theory...

UncleRick

11 years ago

Everything is theory until the first one is actually physically working. No?

rinks

11 years ago

I just ran some tests, (real). A TTL's slew rates limit fMAX to just over 1MHZ, the slew rates on a CMOS are much better at about 70ns rise/fall time, limiting it to about 7 MHz. But that's connected as a Schmitt trigger gate, (best case).

rinks

11 years ago

I'm not knocking his effort, just pointing out that every circuits' SPICE engine ignores some details, otherwise it would take literally forever to simulate on android.

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