High frequecy edge slowing for 22MHZ

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umesh49

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Hi,
I am trying to slow down the edge of 22MHZ clock and searching for appropriate solution.
I want to convert this clock to almost a triangular waveform without effecting my DC levels. it is 0 - 3.3V waveform. Using capacitor is adding a DC offset in my waveform. I would appreciate any suggestion.

Thanks in Advance;
Umesh
 

Using capacitor is adding a DC offset in my waveform.
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That's not plausible and demands at least for detail explanation.

"Adding a capacitor" is rather vague. You can form a low-pass with the output impedance of the clock driver (what is it?) by a connecting a parallel capacitor. It would primarly cause a symmetrical waveform modification, unless the clock driver is very asymmetrical, e.g. a TTL output.

Generally RC or RLC low-pass filters are an appropriate means to "slow down" clock edges. You'll hardly get a triangle waveform with passive wave shaping circuits, rather exponential or gaussian pulse waveforms.
 

Adding a fixed resistor> ESR of the driver will give more linear results.
( typ 25 ohms for ALCV2@3.3V) and reduce the variation in ESR for logic 1 vs 0. which causes the shift in DC or average voltage for a 50% duty cycle signal.
 

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