chunlee
Advanced Member level 4
l'm design a common gate LNA using CMOS technology. The input and output port of the CG-LNA need match to 50 ohm.
i chose the W/L of the mosfet so that its 1/gm = 50 ohm = input impedence. But the problem is when i try to match the output port of the LNA to 50ohm using LC matching circuit, i found that the impedence of the input port will vary from 50ohm.
How can i solve this problem? Why i read from the paper, they use 1/gm=50,they still can match the output port to 50ohm?
thanks.
regards,
chunlee
i chose the W/L of the mosfet so that its 1/gm = 50 ohm = input impedence. But the problem is when i try to match the output port of the LNA to 50ohm using LC matching circuit, i found that the impedence of the input port will vary from 50ohm.
How can i solve this problem? Why i read from the paper, they use 1/gm=50,they still can match the output port to 50ohm?
thanks.
regards,
chunlee