HMC346 for positive control voltage operation

Question

Dear ADI support, 
 Can the HMC346AMS8G switch be used with 0/+5V control voltage by connecting the ground paddle and ground pins to +VDD and DC blocking the RF input / output pins? 
 If so, is there any anticipated problem with RF performance aspects such as return loss, distortion or insertion loss / isolation? 
 Any precautions when doing this? Thank you, 
 Jerry

salemdar · Accepted Answer

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)

salemdar · Answer

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

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HMC346 for positive control voltage operation

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