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Electronics Forum / Basics / April 2007At what frequencies does a ground plane become important??
Would a 555 square wave oscillator running at 30Khz work any better with or without a ground plane? I need the harmonics unhindered. > Would a 555 square wave oscillator running at 30Khz work any better > with or without a ground plane? I need the harmonics unhindered. A ground plane for what? On Apr 29, 1:52 pm, "Tom Biasi" <tombiasi@********optonline.net> wrote: > > Would a 555 square wave oscillator running at 30Khz work any better > > with or without a ground plane? I need the harmonics unhindered. > > A ground plane for what? Ground plane for the copper clad circuit board. > > > Would a 555 square wave oscillator running at 30Khz work any better > > > with or without a ground plane? I need the harmonics unhindered. > > > > A ground plane for what? > > Ground plane for the copper clad circuit board. LOL ! Surreal. Graham > On Apr 29, 1:52 pm, "Tom Biasi" <tombiasi@********optonline.net> > wrote: [quoted text clipped - 4 lines] > > Ground plane for the copper clad circuit board. Which harmonics? The 10th is only 300kHz and as John pointed out, pc board distances are unlikely to matter much. By the 100th harmonic (which is going to be very weak coming from a 555) if you look hard, you might find some pc board influence. Chuck > Would a 555 square wave oscillator running at 30Khz work any better > with or without a ground plane? Define better. Graham > Would a 555 square wave oscillator running at 30Khz work any better > with or without a ground plane? I need the harmonics unhindered. A well bypassed and layed out 555 would not work measurably better on a ground plane board, except, possibly for radiated EMI. The added capacitive load of the ground plane under the traces may actually slow the rise and fall time of the output, very slightly. > Would a 555 square wave oscillator running at 30Khz work any better > with or without a ground plane? I need the harmonics unhindered. at 30Khz a ground plane is unneccesary unless you're seeing harmonics where you don't want them. Bye. Jasen |
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