| 摘要 |
The present invention discloses a digital down converter (DDC) for a multi-mode receiver. According to the present invention, the DDC for a multi-mode receiver includes: a plurality of numerically controlled oscillators (NCOs) which frequency-converts digital data into a baseband component and an image component in accordance to a multi-mode to output an in-phase signal (I) and a quadrature-phase (Q) signal; a first digital filter to remove the image component from a baseband component and an image component of the I signal and the Q signal based on a preset first filter coefficient value when receiving the I signal and the Q signal output from the NCO; a plurality of first decimation units to reduce a bandwidth of the I signal and the Q signal output from the first digital filter; a second digital filter to filter a noise component of a part other than a desired region in the bandwidth of the I signal and the Q signal based on a preset second filter coefficient value in accordance to the mode; and a plurality of second decimation units to reduce a bandwidth of the I signal and the Q signal output from the second digital filter. |
