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Broadband Wireless
Designed several baseband signal conditioning and controller cards for a gigabit wireless radio link in the E-band frequency spectrum (71-76 GHz and 81-86 GHz). I was part of a team responsible for the first few successful prototypes that helped secure additional funding through to the first production run. The card retimed and encoded/decoded signals from the IF modem and routed it to an SFP (fiber or copper) network. It managed variable bit rates from 125Mbps to 2.7Gbps; monitored temperatures in the enclosure; monitored and adjusted transmit power, a built in BERT, and hosted another plug in card for web based setup, monitoring, and control. It used a mix of CML and PECL logic, I2C, SPI, UART, ADCs, DACs, comparators, low noise power distribution, and optically isolated I/O. I am a co-inventor of an antenna alignment algorithm patent for this product.
Developed concept for an embedded system in a Local Multipoint Distribution Services (LMDS broadband wireless 24/28GHz) network transceiver. The design involved control and monitoring of proprietary monolithic microwave integrated circuits (MMICs); telemetry modulator/demodulator and switch; in-circuit programming, diagnostics and test; power supply and power distribution. Also worked on an up/down converter for a cable modem demonstration requiring some microwave design in the 900MHz range. Involved concept development, electronic circuit design, system engineering and block diagrams.
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