Patent ID: 8938207
Filing Date: 2015-01-20
Classification: H03F,H03G

Abstract:
1. A radio frequency (RF) receiver, comprising: a local oscillator configured to generate a local oscillator signal; a mixer configured to multiply a received RF signal by the local oscillator signal, thereby to downconvert the received RF signal to a downconverted signal; a control unit configured to determine whether an interfering signal is received or not, from the downconverted signal, a variable gain amplifier configured to amplify the received RF signal based on a gain control signal, and to output an amplified signal; and a peak detector configured to determine a peak value of the amplified signal, wherein: the control unit changes a phase noise characteristic of the local oscillator based on a determination result of whether an interfering signal is received or not, if the control unit determines that an interfering signal other than an adjacent channel interfering signal is received, the control unit generates the gain control signal which specifies a gain so that a range of the peak value is a first range, if the control unit determines that no interfering signals other than the adjacent channel interfering signal e received, the control unit generates the gain control signal which specifies the gain so that the range of the peak value is a second range, and an upper bound of the second range is lower than an upper bound of the first range, and a lower bound of the second range is lower than a lower bound of the first range.