IMAGE REJECTION MIXER HAVING IMAGE FREQUENCY REMOVAL CHARACTERISTICS BY MISMATCH COMPENSATION

摘要

The present invention for removing the image frequency mixer: relates to (Image Rejection Mixer IRM). The present invention to achieve this object is achieved for the image frequency rejection mixer: In (Image Rejection Mixer IRM), the input signal of the first local oscillation frequency in-phase signal and the first local oscillation frequency correction 90 ° delayed than the phase signal first local oscillator frequency quadrature signal with each mixing and the first gain and the second having a second gain, each first mixer and the second mixer, the first mixer and a first analog to respectively convert the analog to digital output signals of the second mixer digital converter and second analog to digital converter, the first claim of the analog-to-digital conversion unit output signal second local oscillation frequency in-phase signal and the second local oscillation frequency correction 90 ° delayed second local oscillation frequency quadrature phase than the phase signal signal and the respective mixed, and a third mixer and a fourth mixer, and said second analog-to-digital conversion unit output signal with a third gain and a fourth gain, respectively A second local oscillation frequency in-phase signal and the second local oscillation frequency in-phase signal than the 90 ° delayed second local oscillation frequency quadrature signal with each mixing and fifth gain and the fifth mixer with a sixth gain respectively, and the sixth mixer, the third mixer and a subtracter for subtracting the output of the sixth mixer and said fourth mixer, and wherein the said first to compensate for the output of the adder, the subtracter, and an adder for applying the output of the five mixers first mixer and the second mixer It means for compensating the gain owing to differential between the impact, and the subtractor, and to compensate for the output of the adder of the first local oscillation frequency in-phase signal and the first local oscillation frequency quadrature phase effects due to the phase difference between the phase and 90 ° between the signals a means for compensation.