| 摘要 |
PROBLEM TO BE SOLVED: To provide a wireless receiver whose receiving performance can be improved by setting the voltage range of conversion from a demodulated signal to a digital signal to optimum values. SOLUTION: The wireless receiver comprises a local oscillation part 5 which generates a local oscillation frequency; a mixer part 6 which mixes a received radio wave with the local oscillation frequency to perform conversion to an intermediate frequency; a demodulator 8 which demodulates the signal converted to the intermediate frequency; an AD converter 9 which converts the demodulated signal to a digital signal; a frequency division part 11 which outputs wireless unmodulated signals of two frequencies in the intermediate frequency band; a switching part 12 which switches the output of the frequency division part 11 or mixer part 6; and a reference voltage calibration part 13 which calculates a converted voltage range that the AD converter 9 requires from output voltages obtained by demodulating the unmodulated signals of the two frequencies when the switching part 12 selects the frequency division part 11 and sets a reference voltage corresponding to the converted voltage range to the AD converter 9. The AD converter 9 samples a signal demodulated within the set converted voltage range. COPYRIGHT: (C)2006,JPO&NCIPI
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