Signals in Phase - RF Cafe Forums
Post subject: signals in phase
Unread post Posted:
Fri Feb 11, 2005 6:39 am
Fri Feb 11, 2005 6:32 am
have a question:
I have two signal generators. I´d like to make
two signals 1900MHz with a phase between them. In the generators
there is a option where you can chenge the starting phase. If I
put this two signals made in a power combiner in your opinion they
will be stable in phase. I mean the different phase between them
will be always the same. Of course they are syncronized
in advance, wallace0075
Unread postPosted: Fri Feb 11, 2005 9:00 am
The two signals will maintante the same phase difference
+ the phase error of the splitter. But you can calibrate out the
phase error by adjusting the phase of one of the signals to compensate
for the phase error of the combiner.
Post subject: Phase shift
Unread postPosted: Sat Feb
12, 2005 1:50 pm
Just because 2 signals
are at the same frequency doesn't mean that the phase shift between
them can't vary. Noise in one generator that isn't in the other
will show up as a phase shift between the two.
To put it
another way: in a phase-locked-loop, the phase error is the signal
that provides the feecback which tunes the VCO. So unless the generators
use a 3rd order loop, there will be a phase error in each generator,
which will change with temperature, voltage, etc.
absolutely *MUST* verify that your generators will do what you want.
Unread postPosted: Mon Feb 14, 2005 10:40 am
I thought what
wallace was trying to achieve here was to have to signals of same
frequency but different phase. Depending on what he has a generator,
there are many that are capable of adjusting the phase of the signal.
Naturally, he will need to calibrate the signal to cancel out errors
in the system.
Unread postPosted: Tue Feb 15, 2005 3:43 am
I have an idea
If I put a trigger with the same frequency of the
two signals that I want get, and I sincronyze all, Can I get in
the output the two signals stable in phase ??
Tue Feb 15, 2005 4:15 am
I have an idea abot this.
I put a trigger with the same frequency of the two signals that
I want get, and I sincronyze all, Can I get in the output the two
signals stable in phase ??