Does this device have an internal charge pump to generate negative voltages?
Is there data showing the isolation between control lines and RF ports?
THe HMC291S does have an on-chip negative voltage generator. It biases the drain-source channel of the FETs at a fraction of positive supply voltage (Vdd) so the FETs in attenuator bits can be turned on and off using positive control voltages applied to their gates.
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