PLL used for differential interference analysis

Hello,

Can you tell me what the TI part no. is for the device in question?

Hello, Mr Jeffery Pfarr

Thank you for your replay.

I am sorry that there is little information given to you.

I'd like to use the LMX 2492.

Can the LMX 2492 solve my problem?

Best Regards,

Hello, I'm going to refer you to an Apps. Engineer that is responsible for this device.

Hello, Mr Jeffery Pfarr.

Thank you for your replay.

I appreciate what you did.

I am waiting for the message again.

Best Regards,

Hi There,

For a simple PLL, the output of the VCO will be phase aligned with the reference clock.
With LMX2492, the VCO output will also be phase aligned with the reference clock, maybe with some little delay created by the PFD_DLY register setting. PFD_DLY is intentionally added to the phase detector in order to reduce spurs.

Thank you for your reply.

PFD_DLY register adjusts the timing of lock by adjusting pulse width of Charge pump.
What I want to control is the direction of phase advance.
(I drew a figure in the attached file)

The phase at the start of Charp can be arbitrary, but I want to fix the direction in which the phase advances.

Is it possible to fix the direction in which the phase advances with the LMX 2492?

Also, if it is not possible with an IC, is it possible to control the phase with an external circuit?

phase timing chart.pdfWe will be wqqqaiting for your reply

 

Hi,

is this something you are looking for? I don't think we have control on the phase.

Hello, Mr Jeffery Pfarr.

Thank you for your replay.

I am terribly sorry for the delay in contacting you.

It will be the last question.

Is it possible to adjust the phase at the beginning of Charp?

Looking at the Phase graph, the Phase at the beginning of Charp is irregular.

Is there a way to make Phase constant?

Best Regards.

Hi there,

I am afraid we don't have control to the phase.