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ADMV1013S Last Time Buy
The ADMV1013S is a wideband, microwave upconverter optimized for point-to-point microwave radio designs operating in the 24 GHz to 44 GHz RF range. The...
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ADMV1013S on Analog.com

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How can I suppress in-band spurs such as 3*LO, 4*LO, and 5*LO when using the ADMV1013?

There is no configuration option for reducing the spurs. When the LO is applied to the part, it is amplified which increases its harmonic content. Backing off the LO power will at some point cause the harmonic spurs to reduce but with that comes higher output noise. You can also reduce the RF input power to the part but any spur reduction that results from this will be dB-for-dB with the input power, so no dBc gain.
Tags: RF Mixers admv1013 I/Q Upconverters/Transmitters