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RF Switches Guide Signals In Smart Phones

From Skyworks Solutions, Inc.

Smart phones represent the leading edge of RF personal communications, as well as
one of the most challenging of RF product designs. These third-generation (3G) cellular
multimode, multiband devices can operate in three or four bands based on EDGE/GSM
(2.5G) standards and as many as three to four bands of the 3G WCDMA/ HSPA
standards. Evolving versions of smart phones will support additional bands using
WCDMA and 3GPP Long Term Evolution (LTE) standards requiring as many as 10 or
11 frequency bands of operation. One of the key components in enabling so many
frequency bands and operating modes within one small device is the RF switch, which
is used in various forms throughout a smart phone's front-end circuits.

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RF Upconverters and RF Downconverters
RF upconverters and RF downconverters are integrated assemblies that convert microwave signals to another frequency range for further processing. Generally, they are designed to produce an output signal frequency for a particular frequency band.
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RF frequency converters are integrated component assemblies required for converting microwave signals to lower (or intermediate) or higher frequency range for further processing.  
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RF filters and microwave filters are devices that pass or reject signals by frequency. Basic types include bandpass filters, band reject filters, low pass filters, and high pass filters.
RF Band Pass Filters
RF band pass filters are active or passive circuits that pass signals from a specific frequency band and reject signals from out-of-band frequencies. Surface acoustic wave (SAW) filters, crystal filters, and cavity filters are types of band pass filters.
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