I'd like to use an HMC1097 as an image-rejection upconverter to go from 70 MHz to 500 MHz. The 70 MHz signal comes from an existing single-ended source, not a DAC. Would I be able to transformer couple the I and Q inputs as shown below to convert from single-ended to differential while also applying the 0.45V common mode voltage needed by the HMC1097?
U2 (Mini-circuits LRPQ-70) is a quadrature hybrid transformer used to generate the I and Q signals from the input IF. The T1 and T2 (Mini-circuits TC4-1TG2+) are 1:4 transformers with center tap, and the center taps are tied to the bias voltage generator, and are AC grounded through C3 and C4. R6 and R7 provide the termination resistors so that each output of U2 sees 50 ohms.
Please advise if this is will work, or if there is a better alternative to consider.