| 摘要 |
PURPOSE: A satellite broadcasting signal receiving device is provided to expand a receiving range of a weak field signal and a receiving range of a strong field signal at the same time by offering power supply voltage from a low noise driver to a low noise amplifier in proportion to AGC control voltage with a demodulator. CONSTITUTION: A low noise amplifier(200) performs low noise amplification of a filtered signal of a band pass filter(110). An I/Q signal output unit(400) outputs an I/Q signal with mixing of an amplified signal and a local oscillation frequency. The I/Q signal output unit performs AGC with reception of AGC(Auto Gain Control) control voltage. A low noise driver(300) offers power supply voltage to the low noise amplifier with the reception of AGC control voltage. A modulator(500) demodulates I/Q signal.
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