I am doing my thesis on RF MEMS varactor. I just want to know about devices which are digital and require less than 5 voltage like if i talk about radio then how rf mems Varactor is used in radio as radio is example of digital communication systems.
Dear Ayesha,
welcome,
The power supply voltage VDD is scaled as the MOS transistors are scaled down in size. So, every technology node has its suitable operating voltage which gets smaller with minimum feature size reduction. The most advanced MOS transistor with sub 100 nm channel length operate at a voltage of 1.2V
The varactors are used in tuning of the voltage controlled oscillators which are considered analog devices.
Best wishes
Abdelhalim abdelnaby Zekry Sir can we use low voltage varactor for digital communication too?
Dear Ayesha,
welcome again,
I would like that you see the documents at the link about the characteristics of low voltage varactor diodes:https://www.infineon.com/cms/en/product/rf-wireless-control/rf-diode/rf-varactor-diode-and-tuner/vco-and-low-voltage-tuner/#!documents. You can use low voltage varactor diodes to build tuned voltage controlled oscillators and and tuned LC filters.
Best wishes
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