| 摘要 |
<p>The invention relates to frequency conversion systems, in particular for use as up-converters or down-converters in radiofrequency (RF) receivers or transmitters, exemplary embodiments including a radiofrequency receiver (1000) comprising: an RF signal input (1001); a mixing module (1002) comprising a first plurality of IF amplifiers (1004 1-3 ) each connected to the RF signal input (1001) via a switch (1003 1-3 ); a multi-phase local oscillator signal generator (1300) configured to provide a switching signal to each switch (1003 1-3 ); and a summing module (1005) configured to receive output signals from each of the IF amplifiers (1004 1-3 ) and to provide a second plurality of output IF signals from a weighted sum of the IF amplifier output signals, wherein the second plurality is different to the first plurality.</p> |
