Differential output of RF transceiver - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues - primarily having to spend time purging garbage posts from the board. At some point I might start the RF Cafe Forums again if the phpBB software gets better at filtering spam.

Below are the old forum threads, including responses to the original posts.
-- Amateur Radio
-- Anecdotes, Gripes & Humor
-- Antennas
-- CAE, CAD, & Software
-- Circuits & Components
-- Employment & Interviews
 -- Miscellany
-- Swap Shop
-- Systems
-- Test & Measurement
-- Webmaster

RF_guy
Post subject: Differential output of RF transceiver
Unread postPosted: Thu Mar 24, 2005 12:03 pm

When it is mentioned that the output of the RF transceiver chip is differential, what does it exactly mean?

Why can't we connect the differential output of the RF chip directly to the antenna? and what interface is required?

What other kinds of outputs can be provided in the transceiver IC?

Thanks in advance for your comments and answers.


Top


Guest
Post subject: Balanced Output
Unread postPosted: Tue Mar 29, 2005 1:59 pm

There are other names for balanced outputs: differential, push-pull, and so on. The chip provides them so you can get the rated power more easily with the circuitry they can put on a chip. The opposite is "single-ended" or "unbalanced".

BUT: you need either a transformer or balun to get to single-ended, which you need for most antennas. These are too bulky to fit on an IC, so they "let" you use one externally. ("Require" is more like it, if you want the rated power!)

Without a frequency range, I can't help on what the most appropriate device would be.

Good Luck!


Top


RF_guy
Post subject:
Unread postPosted: Fri Apr 01, 2005 12:02 am

Thanks a lot for your suggestion and help.

My frequency range is between 3.1-10.6 GHz. Can you suggest me what devices should i go for?

Also, the transceiver chip that I'm going for may have a balun fitted in the chip (sometime later this year). Does that mean that i can directly connect the antenna to the chip?

Thanks


Top


mcp
Post subject:
Unread postPosted: Thu Apr 07, 2005 4:40 pm
Offline
Lieutenant

Joined: Thu Apr 07, 2005 4:03 pm
Posts: 2
Maybe this will help:

http://www.odyseus.nildram.co.uk/RFMicr ... Design.pdf





Posted  11/12/2012