| 摘要 |
PROBLEM TO BE SOLVED: To provide a radio receiving circuit which makes appropriate a level diagram.SOLUTION: A radio receiving circuit includes a low-noise amplifier 20 (first amplifier) which amplifies a received radio frequency signal, a frequency conversion circuit 21 which multiplies a signal from the low-noise amplifier 20 by a local oscillation signal and converts the resulting signal into a baseband signal, capacitors C1 and C2 interposed between the low-noise amplifier 20 and the frequency conversion circuit 21, and an operational amplifier AP that includes feedback resistors RFB1 and RFB2 having variable resistor values and amplifies the baseband signal. |
