I'm designing a broadband radio receiver that needs to work from about 5 MHz to several GHz. For the lower band of the spectrum (5MHz-600MHz) we thought about using up-conversion to shift it to a center frequency of about 2.4 GHz for several reasons. I want to keep this subsystem as integrated as possible so an upconverter with integrated synthesizer for the LO would be the best choice. ADRF6655 seems to meet the requirements of linearity and input power for the application but seems like the RF input is only matched from 100 MHz. Would it be possible to externally match it to work from 5 MHz? Are there any other restrictions apart from matching what would prevent operation down to that frequency?
Thanks for your attention,