Mixer's upconversion problems: need some suggestion about measurement reading
时间：04-05
整理：3721RD
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Dear all,
my project includes the use of one SMD mixer, SYM-25DLHW (http://217.34.103.131/pdfs/SYM-25DLHW.pdf) , used to upconvert a square signal (DC-to-around 30MHz) to RF tones (300 to 1500 MHz). Everything on the paper seems perfect, but once I've tried measuring an evaluation board I found out some strange output (se attached image). The mixer seemed also to manage badly the lower frequencies according to my opinion. I've tested other similiar mixers, like ZEM-4300MH+ (http://217.34.103.131/pdfs/ZEM-4300MH+.pdf), which worked perfectly (can be seen on the other attachment) with the same settings.
I've sent mails to the minicircuit's technical office , but it seems their e-mail server is off, since I only receive delivery notification fail. So I will ask you guy, if possible, to find out the problems with this device.
The images have a x-axis and y-axis value of respectively 1us/div, 200mV/div. The IF signal is lower than the maximum input possible (5dBm), so it isn't surely that kind of problem.
Attachment 97883Attachment 97884
my project includes the use of one SMD mixer, SYM-25DLHW (http://217.34.103.131/pdfs/SYM-25DLHW.pdf) , used to upconvert a square signal (DC-to-around 30MHz) to RF tones (300 to 1500 MHz). Everything on the paper seems perfect, but once I've tried measuring an evaluation board I found out some strange output (se attached image). The mixer seemed also to manage badly the lower frequencies according to my opinion. I've tested other similiar mixers, like ZEM-4300MH+ (http://217.34.103.131/pdfs/ZEM-4300MH+.pdf), which worked perfectly (can be seen on the other attachment) with the same settings.
I've sent mails to the minicircuit's technical office , but it seems their e-mail server is off, since I only receive delivery notification fail. So I will ask you guy, if possible, to find out the problems with this device.
The images have a x-axis and y-axis value of respectively 1us/div, 200mV/div. The IF signal is lower than the maximum input possible (5dBm), so it isn't surely that kind of problem.
Attachment 97883Attachment 97884
The attachments cannot be opened. Have you adjusted a proper IF input without a DC bias? Have you filtered one RF sideband only? Do you use a correct LO input?
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