Integrating Ultra CMOS Designs in GSM Front Ends
Today's handsets require an RF front-end that can select between transmit and receive, as well as select different frequency bands. New processes remove the size and bulk associated with traditional switching devices.
Early handset designs could duplex between transmit and receive using a circulator (see Figure 1a). But supporting multiple bands, with the same design, requires multiple circulators. Such ferrite-based design makes the phone both bulky and expensive. In some cases, circulators will not work because their bandwidth is too limited.
Due to the equations in this article, we have made a PDF available for you to download.
Peregrine Semiconductor Corp.
http://www.psemi.com
©
2012
Advantage Business Media
|
