the ADL5370 minimum operating frequency is 300 MHz.
Which performances are affected if the part is operated down to 200 MHz?
The limitation at operating frequency comes from the limitation in generating accurate quadrature LO signal. So operating ADL5370 at lower frequencies results in the performance degradation of sideband suppression. It starts to fall apart at 300 MHz(refer to Figure 12 below).
We may null and optimize this degradation somewhat by phase/amplitude adjustment externally in DAC. Not sure this optimization over temp. Or one idea would apply an LO of 300 MHz along with a complex IF of 100 MHz. This would yield a single sideband output (also called a complex IF) at 200 MHz. Since the LO quadrature splitter is seeing 300 MHz, sideband suppression should be okay.
Performance other than sideband suppression would be okay.
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