Othello---FREE

john019

【文件名】:06530@52RD_Othello.pdf
【格　式】:pdf
【大　小】:69K
【简　介】:free
【目　录】:
Analog 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 Zero-
IF 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 active circuitry for the radio. The AD6524 is a
fractional-N synthesizer that features extremely fast lock times to
enable advanced data services over cellular telephones—such as
high-speed circuit-switched data (HSCSD) and general packet
radio services (GPRS).