I checked the datasheet of HMC435AMS8G, and cannot find the threshold voltage range of control ports A and B. Can I use a 4.0V control voltage?
The HMC435A has no integrated logic driver on the control ports. Control ports are directly connected to the gate of internal series and shunt switching FETs so the applied control voltages directly affect the RF performances, especially large signal performances (P1dB and IP3). We recommend a tight tolerance of +/-0.2V on the control voltage level (Vctl=0/+5V) for minimal performance variation from datasheet specs.
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