I brought an EVB of ADRF6655 from your distributor and tested it. Here are two queries that need your help.
1, I measured ADRF6655 output signal through spectrum analyzer.
But measured conversion gain is about - 6 dB in the spectrum analyzer.
(voltage conversion gain : 6 dB in datasheet)
The gain seems not match the specifications in the datasheet…
What’s the reason?
2, When I measured the ADRF6655 as up-converter using internal LO frequency.
Some frequencies don’t normally operate.
- RF input frequency: 470~ 698 MHzà our target IF frequency is 1220 MHz
But another IF frequencies occurred at some RF input frequencies.
- RF: 490 MHz, LO: 1710 MHz à measured IF : 1380 MHz ( target IF: 1220 MHz)
My setting of EVB are shown as below for your reference.
Thanka so much for your kindly help!