Here's an example from a B210. This is a DVB-S2 signal at 10 Msps,
master clock at 40 MHz, lo offset of 4 MHz, and gain set to 70. Remember
that the actual average power of the digital signal is RBW/bandwidth.
30,000/6,000,000 = 0.005. 10*log10(0.005) = -23 dB. So the average power
is 23 dB greater.
B210 spectrum
Ron
On 3/28/23 15:02, Marcus D. Leech wrote:
On 27/03/2023 06:33, sor...@ayecka.com wrote:
I am generating modulated signal. I am varying the digital signal
amplitude. In order to observe the image I use the lo-offset. I get a
low image rejection. Analog devices people told me that this shows
the chip is not calibrated properly.
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I think we're going to need more details of your setup, including
exactly how you're generating your baseband signals.
ADI claims better than about -50dBc for images, and I did some crude
tests, as did another user with a lab
spec-an, and the device is acting more-or-less according to spec.
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