My customer wants to use frequency of ADL5330 from 20MHz to 1GHz.
She measured S21 of ADL5330 evaluation board by network analyzer as below(Vgain=1.4V).
In the above measurement result, ADL5330 gain at 20MHz is 8dB.
But, ADL5330 gain at 20MHz on datasheet is about 21dB as below.
How much is ADL5330 gain at 20MHz?
If the datasheet is correct, how do I improve the gain for low frequency in ADL5330 evaluation board?
Thanks a lot.
Do you still have the 100pF AC coupling caps on the signal lines? These would be C5, C6, C11 and C12.
I would increase C5 & C6 and re-test. If that does not work, increase C11 and C12.
Thanks for your reply.
The customer tested ADL5330 evaluation board with the recommanded method.
The test results are below.
- 1nF, 10nF : No change
- 100nF : Improving gain at low frequency but the ripple is occured(refer to the following image)
- 220nF : The same as 100nF
She could not get the same performance as the above datasheet.
Could you provide the test conditions of datasheet?