A radio receiver, including: a receiver configured to receive a radio signal; a frequency converter configured to generate a baseband signal by converting frequency the radio signal; a subtractor configured to generate a differential signal by subtracting an analog signal from the baseband signal; an amplifier configured to generate an amplified differential signal by amplifying the difference signal by a first amplification factor or a second amplification factor; an analog-digital converter configured to convert the amplified difference signal to a digital signal; an integrator configured to generate an integration signal by integrating a value indicated by the digital signal; a memory configured to store the integration signal into a first address when the amplifier amplifies the difference signal by the first amplification factor, and configured to store the integration signal into a second address when the amplifier amplifies the difference signal by the second amplification factor; and a digital-analog converter configured to generate the analog signal by converting the integration signal stored in the first address of the memory when the amplifier amplifies the difference signal by the first amplification factor, and configured to generate the analog signal by converting the integration signal stored in the second address of the memory when the amplifier amplifies the difference signal by the second amplification factor.