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3. TECHNICAL BRIEF
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3.3.1.2 UMTS RECEIVER (diversity Rx)
The diversity (or secondary) receiver paths are similar to the primary paths. The most significant difference
between the front-end implementations is the primary paths’ ability to support handset transmissions; the
diversity paths are receive-only.
An antenna switch selects the RF operating band, and then a bandpass SAW filters the incoming Rx signal.
This filter should provide a differential output.
HB input can be shared by the AWS and 2100 MHz bands. It is possible to share one input between these two
bands because their Rx operating range overlaps (AWS = 2110 to 2155 MHz; IMT = 2110 to 2170 MHz).
[Figure 3-7] 3G Receiver path (diversity)
[Figure 3-8] 3G Receiver path (diversity)