Proxim PCI5 User Manual

 

Document # 610.00xx 
 
PRODUCT: 
The product is a WLAN adapter operating in the 5.15 – 5.35 GHz band with a maximum TX 
output power of 50mW.  It is a circuit board assembly with a 62-pin power/data card edge 
connector and a pair of integral antennas.  The peak gain for the two antennas is 3dBi and 1dBi, 
respectively.  Refer to the manual for MPE statement.  The device is design to fit into a universal 
PCI slot inside a PC. 
 
USER CONNECTIONS: 
Data and power are provided through the 62-pin card edge connector.  A unique antenna 
connector is provided for attaching each of the antennas to the adapter. 
 
TEST CONNECTIONS: 
There are two 50 ohm RF ports on the PCA, one for each of the two antenna connections.  Each 
antenna is terminated with a Radiall UMP3.0 lock-on plug.  A slide-on version of the plug can be 
used during FCC certification for conducted measurements.  
 
INTERNAL CLOCK AND RF OSCILLATOR FREQUENCIES: 
MAC/baseband Processor ASIC 

32MHz 

PCI BUS interface 

33MHz 

RF synthesizer 

PLL frequencies of 40, 80, or 160MHz derived from a 
32 MHz oscillator 

TX and RX frequencies 

5180-5320MHz, 20MHz steps 

LO Leakage 

4144-4256MHz 

Mixer Product 

6216-6384MHz 

Baseband bandwidth 

20MHz 

 
SIGNAL FLOW: 
Data is transferred through the 62-pin card edge connector (PCI bus) to the MAC/baseband 
processor which integrates the media access control (MAC), the baseband radio functions, A/D 
and D/A converters, transceiver control functions and a PCI/Cardbus interface. 
 
In transmit, the synthesizer tunes to one of the TX frequencies listed above.  Data is initiated at 
the PCI interface, which is part of the MAC/baseband processor.  Current outputs from the DAC 
of the MAC/baseband processor are low-pass filtered through the external reconstruction filter.  
The I and Q signals are converted to RF thru a dual-conversion architecture, from baseband to IF 
and from IF to RF signals.  These signals are driven off-chip through a power amplifier, through 
the antenna switch, and to the antenna connector. 
 
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 and then sent to the PCI interface of the PC.