| 摘要 |
A quadrature down converter comprises two channels, each of said channels comprising two parallel signal paths. Each of said signal path comprises a mixer mixing the signal for down conversion with an oscillator signal. In the in-phase channel the mixers receive the oscillator signal shifted 0 DEG and 180 DEG in phase, respectively. In the quadrature-phase channel the mixers receive the oscillator signal shifted 90 DEG and 270 DEG in phase, respectively. By filtering and combining (adding/subtracting) the signals from the signal paths in each of said channels, the disturbing second order terms from the mixers may be substantially eliminated. <IMAGE> |
