| 摘要 |
An FM transmitter improved in degree of freedom of selecting components. The FM transmitter comprises an oscillator (72) connected to a crystal oscillator (70), a clock generator circuit (50) for generating a clock signal having a frequency which is an integral multiple of the frequency of the output signal from the oscillator (72) by using the output signal as a reference frequency signal fr1, a DSP (20) operable synchronously with the clock signal and adapted for conducting digital stereo modulation, digital FM modulation, and digital IQ modulation of inputted stereo data, a frequency synthesizer (60) for generating a signal having a frequency which is an integral multiple of the frequency of the output signal from the oscillator (72) by using the output signal as a reference frequency signal fr2, mixers (40,42) for mixing the signals outputted from the DSP (20) with the signal generated by the frequency synthesizer (60), an adder (44) for adding the outputs from the mixers (40,42), and amplifier (46) for amplifying the output signal from the adder (44) to transmit it from an antenna (48). |
