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45 MHz IF breakthrough
Hi,
OK I have a 45MHz crystal filter for my first IF. The first LO ranges from 45-75MHz. To test I am using a 45.455MHz LO, which is a pll design. When I connect up the LO to the mixer, with no input signal I get a -80dBm level out of my IF stage!! The PLL is clocked off 1MHz ref divided down to 5KHz. The 1MHz ref is a TTL signal. Could this be the cause of the problem, and if so how do I get around it? Thanks, John. |
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