What could be causing the unexpected peaks at the RF and LO input frequencies instead of the expected 1 GHz intermediate frequency when using the LTC5552 in differential mode?

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Accepted Answer

It looks like you are getting excessive LO-to-IF and RF-to-IF leakage. To troubleshoot this issue, first determine if the results are from your custom board or the customer evaluation board. If you have an evaluation board, try repeating the setup on it to see if the issue persists. Ensure that VCC is connected to 3.3V and all ground pins are connected to ground. Measure the supply current, which should be around 130mA. Check if the current drops to <

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LTC5552 : FAQ