OthelloOthello: A New DirectConversion Radio Chip Set Eliminates IF Stagesby Dan FagueINTRODUCTIONAnalog Devices recently announced the revolutionary Othello direct-conversion radio for mobile applications. By eliminating intermediate-frequency (IF) stages, this chip set will permit the mobile electronics industry to reduce the size and cost of radio sections and enable flexible, multistandard, multimode operation. The radio consists of two integrated circuits, the AD6523 ZeroIF Transceiver and the AD6524 Multiband Synthesizer. The AD6523 contains the main functions necessary for both a directconversion receiver and a direct VCO transmitter, known as the Virtual-IF transmitter. It also includes the local-oscillator generation block and a complete on-chip regulator that supplies power to all ac……
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