FM TRANSMITTER AND NON-FM RECEIVER INTEGRATED ON SINGLE CHIP

摘要

the exemplary embodiment can be frequency modulated (FM) comprises a transmitter and receiver non -FM, these same may be implemented on an IC chip. The FM transmitter may comprise a digital FM modulator, a low-pass filter, amplifier, and the LC tank circuit. Digital FM modulator receives a digital input signal, performs FM modulation with the digital input signal, it is also possible to provide a digital FM signal. Has a low-pass filter may be provided to filter the digital FM signal, the filtered FM signal. The amplifier may be able to provide an output FM signal by amplifying the filtered FM signal. LC tank circuit may filter the output FM signal. Digital FM modulator is a multi-in PLL - a variable frequency division ratio of the frequency divider modulus may be performed by changing the FM modulation. Delta-sigma modulator may generate a modulator output signal used to obtain a variable frequency division ratio to receive a digital input signal