| 摘要 |
A receiver system includes an antenna to receive a high-frequency signal; a first band pass filter circuit to eliminate unnecessary frequency components from the high-frequency signal; a low-noise amplifier to amplify signal output from the first band pass filter circuit; a local oscillator to produce a local oscillation signal; a mixer to mix signal output from the low-noise amplifier and the local oscillation signal to produce an intermediate signal; a second band pass filter circuit to eliminate unnecessary frequency components from the intermediate signal; an amplifier to amplify signal output from the second band pass filter circuit; a demodulator circuit to demodulate signal output from the amplifier; an analog-to-digital converter circuit to convert signal output from the demodulator into digital signal.
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