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HMC452QS16G power consumption


I'm using the HMC452QS16G amplifier with Vpd=5V (pin 3) and Vdd=5V (or Vs depending where in the datasheet you are). The PCB design is very similar to your evaluation board PCB, and a heat sink and a thermistor is used to monitor its temperature, which is always below 50ºC. Once powered, the supply current (Icq) is 485 mA as specified in the datasheet. When aplying a 456 Mhz RF signal of 10 dBm, well below the 31dBm maximum  rating, the supply current falls to ~250 mA. The current goes back to 485 mA when no RF is applied. Is this a normal behaviour?

Thanks in advance,