Hi there,
-I'm planning to use the MAX2871 to drive the LO port of the LT5546. The MAX2871 offers a differential output (RFOUTA_P and RFOUTA_N), but its impedance isn't specified in the datasheet. On the other hand, the LO ports of the LT5546 are differential but connected to a transformer for a single input (refer to Figure 6). The input impedance of the LT5546's differential LO port is 800 ohms. So, my question is: Can I directly connect the RFOUTA_P and RFOUTA_N to the LT5546's differential LO ports (i.e. 2xLO+ and 2xLO-)? Or do I need a transformer between them? If not, what's the best way to connect these two ICs?
note: The LT5546 requires an LO input ranging from –20 to –5 dBm if a wideband transformer is used. The maximum output power of the MAX2871 is –4 to +5 dBm (single-ended).
- According to Figure 6 of the LT5546, would it be possible to increase the values of the DC-decoupling capacitors (i.e., C27, C28, C30, C31, C33, C34) without making the op-amps unstable? I would like to reduce the cutoff frequency of the high-pass filters formed by these capacitors to 100 Hz.
Thanks in advance for your help
Edit Notes
revised the question[edited by: SmallJoe at 11:36 AM (GMT -5) on 19 Feb 2024]
