Hello all,
I'm designing an RF differential rectifier for wideband RF energy harvesting. I completed the rectifier design and characterization on ADS by using HB simulation.
I fabricated a prototype however I'm confused about how to feed a differential signal to the rectifier input. From my understanding, the RF signal generator output is single-ended (Unbalanced) so how can I convert into differential RF signal (Balanced).
Shall I use two channel RF generator followed by a differential amplifier? or it is better to use an AC transformer? or what about phase shifter?.
Please send me your suggestions about the measurement setup I shall use.
You probably need to use a Balun. You have several options - look up Baluns on the iternet.
hello!! you can use 180[Deg] hybrids I think. they can produce 0[Deg] and 180[deg] output signals from a single source port. search them on google or in ads you can go systems passive> hybrid 180
What is your operating frequency?
You can use rf centered tapped secondary transformer.
You can use a balun to make the transformation from single ended to differential output signal as proposed by Malcom.
You can use active phase splitter circuit. Which can be built with single transistor biase in class A and has one collector resistor Rc and one emitter resistor Re with Re=Rc.
You can use operational amplifier with single ended input and differential output. In order to achieve signal splitting at high frequency you can make the gain of the amplifier= 1.
Best wishes
The 180 degree hybrid as Hamid says is also a good solution. In some forms a 180 degree hybrid and a balun might be indistinguishable.
Thank you too much for your kind reply, i will try to use either the hybrid coupler or a balun to properly feed the rectifier circuit.
Prof. Zeky, the desired frequency is from 800MHz to 3 GHz so the center frequency is about 1.9GHz.
I have a question about the balun and 3-dB hybrid bandwidth, can both achieve a broadband characteristic?
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