I created a Phase Locked Loop circuit using
Multisim10.0. It uses the Multisim clock oscillator, and the circuit
appears to work great.
However,
I just discovered that if I use the same parts that I used to create
the Phase Locked Loop circuit in an oscillator circuit added to the
same schematic, the Phase Locked Loop circuit doesn't work any more,
while the new oscillator circuit pumps out a frequency that is way
off. 4+MHz is no where near 1kHz, the design frequency.
What
happened? The evidence says my newly-added oscillator brings in
something that kills a previously working circuit that uses the same
old parts. Every part used was taken from the previously working
circuit, aside from the variable resistor values. How did the Multisim
rules change from 10.0 to 10.1? What am I missing here?
Did the Phase Locked Loop circuit really work to begin with? Which circuit is the broken one?
As
I see things, in order to solve this puzzle, I need to come up with a
factor that involves both circuits. Some factor is going to kill both
simultaneously.
Note what I'm saying here. (At least when I ran
them this was the case.) Delete just the oscillator circuit, and run
the circuit that remains. It works. Undo the deletion. The
oscillator reappears where it was, and the previously working circuit
stops working. There's something in that oscillator circuit that
kills. It's like switching on and off a light bulb.
Message Edited by Euler's Identity on 08-02-200812:10 AM
