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Hi, everyone. I am design a 2.4GHz CMOS transceiver IC. But I don't know how to connect PA with LNA to share the same antenna, and has TX/RX switch. The PA core and LNA core are depicted as the figure below. Anybody can help me? Thanks!
use two spdt switches.
let say +ant, -ant is the common signal on state 1of swich it connects +ant to +PA and -ant to -PA on the switch toggle +ant to +LNA and -ANt to -LNA
You need tWO SPDT switches to have the required isolation.
Re: [Help] How to connect PA with LNA to share the same ante
Thans everybody, after reference some IEEE paper, I decide to use this switch such as below and use a match network off chip. Tune the LC network to let the LNA's noise as low as possable and the output power of the PA is as large as possable. But I feel it's difficult to tune. Do you have any suggestion?