| 摘要 |
PROBLEM TO BE SOLVED: To improve noise characteristics of a low-pass filter. SOLUTION: This circuit is has a demodulator 2 which outputs a base-band analog signal by demodulating a received signal and the low-pass filter 4 which passes the demodulated base-band analog signal and is provided with an impedance converting means 3 having output impedance lower than the output impedance of the demodulator 2 between the demodulator 2 and low-pass filter 4.
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