Hello.
I have a question. Please tell me.
Looking at the interface schematic for IF1 and IF2 in the datasheet, there is a difference with and without resistors.
I think the internal circuits of IF1 and IF2 are the same, is the datasheet correct?
Checking…
I am using HMC520a as direct QPSK modulator. In this configuration, should I use IF1 as I channel and IF2 as Q channel or otherwise (IF2 as I and IF1 as Q)? A wrong implementation will give me a phase reversal.
I am using HMC520A in a configurable modulator (QPSK/BPSK). When I am using this as BPSK can I just use one port from IF1 and IF2. Should I leave the other port open or terminate using 50 ohm resistance?
Hello, Everyone.
I have a question about HMA520A.
I am referring to figure 83 in the data sheet of the HMC520A.
In Figure 83, an external 90 coupler creates a phase difference for the IF signal.
But, the circuit I think is different from Figure 83.
…Hi,
Since this is a passive IQ mixer the degradation in phase and ampltiude balance from the HMC520A will be similar for up and downconversion. Since your IF input is around 80MHz, I suggest downconverting to 80 MHz with the same LO frequency. After making…
Hi,
The LO leakage that is shown matches the datasheet specification: 15dBm (LO Drive)- 43dB (LO Isolation)= -28dBm. From what I see here the conversion gain is too low. I think you are using HMC520A as an IQ Modulator. There is a way to reject the LO…
You need a PLL which drives a frequency doubler which drives an amplifier. Possible choices might be ADF4371 (PLL), HMC1105 (frequency doubler) and HMC7229 (amplifier). These are not the only choices.
This part is EAR99. The attached RFIC selection guide lists the ECCN codes for all of ADI's RF products.
