Proxim AP5 User Manual

 

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In receive, the synthesizer tunes to one of the RX frequencies listed above.  The receive signal 
path is from the antenna connector, through the antenna switch, a band pass filter, an LNA, a 
receive balun, and to the integrated transceiver IC.  Inside the transceiver IC, the RF mixer 
converts the output of the on-chip LNA to an intermediate frequency.  The IF mixer converts this 
signal down to baseband I and Q signals.  The I and Q signals are low-pass filtered by the 
external channel select filters, and amplified by a baseband PGA controlled by digital logic.  The 
baseband signals continue through external anti-alias filters before being sent to the ADC of the 
MAC/baseband processor.  Data at the PCI interface of the MAC/baseband processor is 
processed by the PCI controller within the processor IC to SDRAM which is then processed by 
the Ethernet controller to serial data to be sent to the Ethernet interface.