| 摘要 |
An offset local oscillator without using a frequency divider is provided to reduce power consumption by not using the frequency divider and to reduce influence of mismatching of I/Q by outputting the signal with a low frequency in a quadrature phase voltage controlled oscillator. An offset local oscillator without using a frequency divider includes a quadrature phase voltage controlled oscillator(200), a multi phase filter(202), and single side band frequency converters(203,204). The quadrature phase voltage controlled oscillator(200) generates an I/Q(In-phase/Quadrature phase) signal having a 1/3 frequency of a local oscillation frequency, and a differential second harmonic wave signal having a 2/3 frequency of the local oscillation frequency. The multi phase filter(202) transforms the differential second harmonic wave signal inputted from the quadrature voltage controlled oscillator(200) into the I/Q signal. The single side band frequency converters(203,204) receive the I/Q signal having the 1/3 frequency of the local oscillation frequency from the quadrature phase voltage controlled oscillator(200), and receive the I/Q signal having the 2/3 frequency of the local oscillation frequency from the multi phase filter(202). The single side band frequency converters(203,204) output the I/Q signal having the local oscillation frequency. |
