Modular RF Architectures

Let’s start with the traditional approach. After spending the morning helping production with some tuning on an amplifier, you finally start reading through the 120-page RFP, SCD, and SOW for the new up-converter. At the end of the source control drawing there is an oddly shaped mechanical outline. The control signal is routed through a hermetic mico-D connector with a custom defined pin-out. While not ideal, the locations of the RF ports are manageable. The eight-month timeline to CDR appears reasonable. However, six months in and it becomes clear that it will take longer and cost more than anticipated. The back and forth iterations with the engineer supporting the custom designed digital control board seem to go on forever. The engineer working on the output module determines that she will need a new heat-sink to keep the devices from becoming too hot. The mixer is generating a spur that wasn’t predicted and somewhere a gain stage is oscillating. The frustrated program manager has to add this project to the long list of development jobs with irate customers.

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