| 摘要 |
According to one embodiment, a radio receiving circuit includes a low-noise amplifier, a frequency conversion circuit, a capacitor interposed between the low-noise amplifier and the frequency conversion circuit, and an operational amplifier that includes a feedback resistor and amplifies a baseband signal. The gains in the frequency conversion circuit and the operational amplifier are kept constant irrespective of the level of a local oscillation frequency input to the frequency conversion circuit.
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