The CDG2000 Front End Board
This is the first module in the transceiver,
and one of the critical ones. It contains the attenuators, switched bandpass
filters, H mode mixer, roofing filters and TX/RX switching. It is controlled by
means of an I2C interface, details of which are available from Philips
semiconductors.
Here you can download an early version of
the article submitted to RadCom, the PCB artwork, pictures of the performance
and supporting material.
Note that this version of the front
end uses a 74AC74 in the mixer to generate the clock.
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