Other NXP ProductsのトピックRe: Contact us about TFF1024HN.

Contact us about TFF1024HN.

kihwanhong — Wed, 28 Mar 2018 10:06:05 GMT

External reference of TFF1024HN We are going to use OCXO instead of Crystal for 25MHz. Is it possible?

It seems that it is not possible with the contents described in AN11516. I wonder if there is another way. Why should I use crystal for phase noise?

I set the LO frequency to 11.3GHz, down conversion from 12.45GHz to 1.15GHz and try to measure phase and delay using network analyzer. How do I configure my measuring equipment?

Re: Contact us about TFF1024HN.

LPP — Mon, 02 Apr 2018 12:25:40 GMT

OCXO can be used as external clock reference with TFF1024HN. Application note AN11516 describes using external crystal oscillator circuit based on 74LVC1GU04. It also describes requirements for XO1/XO2 signals which should the circuit provide.

In this application note, GU04 inverter provides differential output (180 degree phase shift), passive RC networks scale the amplitude and to match output impedances. You can follow the circuit in Figure 17 or make your own circuit for a design that gets a clock from external source (OCXO).

Note, poor layout may cause excessive phase noise and jitter. All the suggestions from Section 4.1 are applicable.

Have a great day,
Pavel

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

Re: Contact us about TFF1024HN.

kihwanhong — Wed, 11 Apr 2018 08:32:29 GMT

Thank you for your reply.

I set the LO frequency to 11.3GHz, down conversion from 12.45GHz to 1.15GHz and try to measure phase and delay using network analyzer.

I want to measure the Group delay of the TFF1024HN. How can I measure it?

I tried the vector mixer Calibration and measurement, but it failed.