Using FET for RFID with modulating signal on gate.
时间：04-04
整理：3721RD
点击：
http://www.eetimes.com/document.asp?doc_id=1276304
I tried to use FET for RFID, and it works. But now i have few questions.
I use grounded source, modulating signal is applied to gate.
Drain and gate are floating!
Drain connected to patch antenna.
Gate connected to audio modulating signal through 1uF capacitor.
Problem #1
I did not applied any bias on gate, it is floating. Modulating signal comes through 1uF capacitor. What must be biasing for such FET RFID configuration?
Problem #2
Drain is connected to antenna, and floating.
Should it be biased?
I tried to use FET for RFID, and it works. But now i have few questions.
I use grounded source, modulating signal is applied to gate.
Drain and gate are floating!
Drain connected to patch antenna.
Gate connected to audio modulating signal through 1uF capacitor.
Problem #1
I did not applied any bias on gate, it is floating. Modulating signal comes through 1uF capacitor. What must be biasing for such FET RFID configuration?
Problem #2
Drain is connected to antenna, and floating.
Should it be biased?