FREQUENCY MODULATED AUDIO TRANSMITTER CIRCUIT USING FULL-CMOS AND FABRICATION METHOD THEREOF

摘要

Provided are a frequency modulated audio transmitter integrated circuit using a CMOS device and a method for controlling the same. The frequency modulated audio transmitter integrated circuit includes audio blocks for receiving audio signals, a frequency oscillator block and a frequency synthesizer block for generating and determining a frequency required for stereo modulation and generation of an FM carrier signal, an FM modulation block for frequency- modulating a mixed signal, and a stereo multiplexing block carrying out multi- state stereo multiplexing on the audio signal in at least 3 states. A stereo multiplexing method and a process technique applied to the audio transmitter integrated circuit are proposed. A multi-state weighted stereo multiplexing method is applied to the stereo multiplexing block of the audio transmitter integrated circuit to minimize harmonic noise components caused by multiplexing and remarkably improve the quality of transmitted audio signals. The audio transmitter integrated circuit is manufactured using a CMOS device technique to realize a small chip having low power consumption. The audio transmitter chip can be effected used in various portable terminals having batteries .