Abstract
The aim of this discussion is about the sender of a wireless communication system. This discussion of problem is overpass by the application of the chips of frequency synthesize implement BU2618FV and micro controller single chip MSP430F112 to operate the sub system which dimensional sound music modulation chip BA1404 was used to modulate frequency of the input sound single. MSP430F112 is the core of the whole wireless system, it duty is to operate the whole system and made all the functions we set before come true. We use the micro controller to setup the divide ratio of the frequency synthesize BU2618FV. As the divide ratio was set, we can adjust the transmit frequency up and down just as one need. The frequency synthesize BU2618FV combined with two exterior circuits VCO and LF so it can build up a integrity Phase Locked Logic which made the transmit frequency locked and ensure us to control the transmit frequency more exactly and allow people to tune up the frequency by use hand. The dimensional sound music chip BA1404 modulate the input music single, this is a integrity communication system. It can run with ultra power low and set all with digital frequency, meanwhile, this system can also save data when power is off. This system can give the transmit frequency between 88MHZ and 108MHZ. By transmit the input single with antenna already, we then take over the single by using a wireless radiogram, while the single was received, this system was proved. In order to make this system more friendly, we also used the liquid glittering to show the transmit frequency. Appliance the DC-DC chip MC34063 to turn the voltage of different kind of elements up and down. By doing this way, this system can make sure our system with one criterion power supply only.
Key words: FM; BU2618FV; MSP430; BA1404; ultra low power