EEVblog Electronics Community Forum
Electronics => Repair => Topic started by: phlegeton on April 16, 2021, 03:56:33 pm
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Hello,
I try to repair a IQ modulator from a R&S SMIQ02. At a first look at the components, I can't identify some smd parts. Hope their is someone we came across these parts, and can help me out. I can read the markings on the parts: The first part seems to have the marking "RP11G N580-4" the second part is under a metal part, but reads "N4".
If a search on this "N4" part I only can find the 'NBB-400' and this is a MMIC amplifier DC to 8Ghz. Which I'm not sure if this is right. I can't find anything on the "RP11G N580-4" part.
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That's an FP1189 Power FET.
EDIT:
https://www.qorvo.com/products/p/FP1189-G#overview (https://www.qorvo.com/products/p/FP1189-G#overview)
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N4 refers to Sirenza/Stanford Microdevices NGA-486.
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Thank you all! With this I can investigate further. I searched high and low. What is the trick to identify these smd parts ?
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http://www.smdmark.com/en-US/search/code?id=fp11g (http://www.smdmark.com/en-US/search/code?id=fp11g)
https://www.google.com/search?q=filetype:pdf+fp11g (https://www.google.com/search?q=filetype:pdf+fp11g)
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ah I see where I got it wrong: I read the first character as "R" not as a "F". Again thanks. Now I now the part numbers it's so much easier to find the right datasheets.
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Make sure you trace the signal path through those RF switches (white squares marked "4227T") before replacing the active devices. I replaced the amplifiers only to find out that the real problem was a bad switch.
https://www.eevblog.com/forum/repair/rohde-schwarz-smiq03b-with-error-110-output-unleveled-iqmod-alc-failure/msg3189932/#msg3189932 (https://www.eevblog.com/forum/repair/rohde-schwarz-smiq03b-with-error-110-output-unleveled-iqmod-alc-failure/msg3189932/#msg3189932)