Re: PCB power planes?

On 7 Jul 2008 17:04:56 GMT, Scott Seidman
<namdiesttocs@xxxxxxxxxxxxxx> wrote:

Joerg <notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> wrote in news:x26ck.31503
$ZE5.27544@xxxxxxxxxxxxxxxxxxxx:

Noise from clocks and stuff: None.

That's not my experience. Switched cap filts are famous for clock bleed
through, and you need to be sure your circuit can tolerate this. The clock
frequency is usually an order of magnitude or more higher than the filter
freq, so you can usually filter out the bleedthrough with an RC.

Also famous for aliasing inputs, aliasing power supply noise, and
making a heap of noise of their own. But the programmability is nice.

The world needs a general-purpose programmable continuous-time lowpass
filter IC. Really.

John

.

Relevant Pages

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    ... Switched cap filts are famous for clock bleed through, and you need to be sure your circuit can tolerate this. ... The clock frequency is usually an order of magnitude or more higher than the filter freq, so you can usually filter out the bleedthrough with an RC. ...
    (sci.electronics.design)