HMC346 for positive control voltage operation

Hi Jerry,

It is possible in theory but supply shifting is not tried/demonstrated for this particular part. What is you RF frequency?

Please note that you should increase all pin voltages. RF pins were initially at 0V, thus they will also be shifted by 5V for example and they would require a DC block. Likewise, the driver opamp needs to be shifted as well...

You would require additional bypass capacitors from GND pins of HMC346A to PCB's RF ground to provide good AC Ground to those pins.

Thanks

Sinan 

6.8 GHz. Yes the ground paddle, pins would be at +5V, the RF pins DC blocked. The concern was mainly about return loss degradation if this mode of operation was functional.

The I-V2 loop aims for return loss optimization for any arbitrary V1 voltage in the default operation. In the shifted operation, if you observe unacceptable return losses, you may tune the impedance correction loop maybe.

You may sweep the 500ohm resistor to 400 or 600ohms maybe