FM broadcasting is radio broadcasting using frequency modulation technology. In order to attain high-fidelity broadcast of music and speech, all audio frequencies up to 15kHz must be transmitted. The ...

It uses a PLL frequency synthesizer built with MC145151, which covers the FM band in 100kHz steps ... so that the output power of the Phase-Locked Loop transmitter can be controlled from zero to 4 W ...

Abstract: A Cartesian transmitter based on pulse width modulation, with the capability to drive a switched power amplifier, such as a Class D stage, is presented. A phase-locked loop based technique ...