Phase-Locked 20-Mhz Oscillator

Posted on Dec 27, 2012    6787

This circuit produces a 20-MHz clock phase locked to a 10-MHz clock present in the Apple MAC II. To generate

Phase-Locked 20-Mhz Oscillator
Click here to download the full size of the above Circuit.

the 20-MHz signal, the circuit produces a 25 ns negative-going pulse delayed 50 ns from the falling edge of the 10-MHz Nubus clock input at point E. NORing that pulse with the Nubus clock produces the 20-MHz clock at point G. Applying the 25-ms pulse to the set input of an S/R flip-flop and the Nubus clock to the reset input results in a 10-MHz square wave at F.

Leave Comment

characters left:

New Circuits