mostafa_maarouf
Junior Member level 1
Hi,
I am designing an RF front end for WCDMA and i designed the LNA but it is single ended to match with the off chip duplexer. Now i am desiging the mixer and it will be differential (Gilbert cell) so i need to convert from single ended to differential.
I thought of building the LNA as differential and use a balun at the start but this will add loss which will build up the noise figure directly..
so i thought that i can make two branches of amplifier (one +ve gain (C-G) and the other is -ve gain (CS)) ) and sense the output differentially which will make the required conversion.
this method is present in a paper in JSSC by rahem Bagheri. but he was implementing a wide band LNA so the C-G worked with him but i need it to be narrow band , will it work with me. ?
Help me with any data i will be appreciating..
Also if there is a simpler method to convert from single ended to differential in mixer or in any place , plz tell me
Best Regrads,
Mostafa El khouly
I am designing an RF front end for WCDMA and i designed the LNA but it is single ended to match with the off chip duplexer. Now i am desiging the mixer and it will be differential (Gilbert cell) so i need to convert from single ended to differential.
I thought of building the LNA as differential and use a balun at the start but this will add loss which will build up the noise figure directly..
so i thought that i can make two branches of amplifier (one +ve gain (C-G) and the other is -ve gain (CS)) ) and sense the output differentially which will make the required conversion.
this method is present in a paper in JSSC by rahem Bagheri. but he was implementing a wide band LNA so the C-G worked with him but i need it to be narrow band , will it work with me. ?
Help me with any data i will be appreciating..
Also if there is a simpler method to convert from single ended to differential in mixer or in any place , plz tell me
Best Regrads,
Mostafa El khouly