Article by Keith Farren

CMOS FM radio tuner has the walkie application FM broadcast reception function in mind to favor deeply by the consumer, the increasingly many walkie products now – -For instance mobile phone, independent radio station, the intersection of MP3 and player, PDA,etc., FM of type, function this as essential ” mark, mix”. In the traditional solution, the radio tuner chip use BiCMOS crafts more, it is roomy to capsulate, also need up to more than 30 additional peripheral components at the same time, bring much inconvenience for the walkie product design. Silicon Laboratories Company introduces tuner series Si470x FM, the characteristic of its maximum is totally realizing and inputting from the aerial into FM function that the audio frequency outputs with cmos process. Compared with traditional solution, by using digital structure, the intersection of reduction and 90% more than the intersection of component and number and 60% more than the intersection of board and space while improving the characteristic Si470x – -Only need a external source by-pass capacitor and can be placed in the board space of less than 20 mm2. Si4700 radio tuner has been integrated selectively filtering, automatic gain control, frequency synthesizer and audio frequency are dealt with. Through these functions, have realized outstanding antijamming capability and signal enhancement ability while accepting FM radio. Can broadcast the sharp tone quality while making the receiving apparatus more weakly in the signal or interfering with stronger environment too. <p align=”center”>

In addition, Silicon Laboratories Si4701 has been combined and directed against the European radio data system (RDS) And American radio radio data system (RBDS) Preprocessors digital,can user giving. In China, already some broadcasting stations have begun to try digital audio broadcasting (DAB) too The service of the respect, its diversified service content and tone quality of CD quality will become the next place of point of growth of the market of walkie audiofrequency apparatus. Si470x tuner adopted MCU that Silicon Laboratories obtains the patent to imbed treatment technology and low IF digital structure. Si4700 and Si4701 have adopted 4mm

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