[SOLVED] Direct Digital Synthesizer

Status
Not open for further replies.
A

ali ghafoor

Member level 4
Joined
Feb 11, 2011
Messages
69
Helped
1
Reputation
2
Reaction score
0
Trophy points
1,286
Visit site
Activity points
1,779
how to measure the Locking Time for DDS practically?..i want to measure the Lock Time of AD9912
 

use a mixer as a phase detector (u need on with a DC coupled IF output). Line length L2 is much longer than L1, so it forms a delay line frequency discriminator. You might need to trim L2 or L1 slightly to get the mixer into quadrature. Drive the power splitter with >14 dBm. The oscilloscope shows the voltage out of the mixer, which stops changing when the DDS reaches final frequency and phase.

 
Reactions: kh4n

    K

    kh4n

    Points: 2
    Helpful Answer Positive Rating
Syncronized zero span SA can be used to measure locking time any kind of PLL.External Sweep Triggering is coupled to Latch Enable signal-for instance- when sweep is triggered zero spanned ( Time Domain Mode) SA will show you ringing and locking time of the carrier.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…