Tx/Rx switch in CMOS design.

Dear all,

I need to design a Tx/Rx switch in CMOS processing. The working frequency is 3 - 5GHz frequency range. Could anyone give me some reading materials or paper discussing about this? I have no idea of a switch design.

Thanks

wccheng

I know that Peregrine is designing RF switches in CMOS process.
http://www.peregrine-semi.com/conten...rf_switch.html
The performances depend by application. For example for a GSM mobile where the switch requirements for P1dB could be up to 38dBm, would be a challenge to do this in CMOS process (at least today). The competitors using GaAs process can get up to 38dBm for P1dB.
Probably where is required a low P1dB it will work.

Dear all,

Do you have some research paper about the Rx/Tx switch design?

Thanks

wccheng

Peregrine uses an SOI process, which gives them an edge over even GaAs? Do a little google research. It's an interesting technology compared to the mainstream.

yeah SOI give a very good isolation between the TX and RX paths , but i am not sure about the power handling , i think in terms of high power , u need to use GaAs or GaN processes

khouly

A mos switch works in linear region
where Vds is very small

so it behave like a resistor

but , the power from the PA is high , may this affect the region of the transistor

khouly

this is the reson for cascaded MOS to ensure its performance
but additional insertion loss included