| 摘要 |
A polyphase filter (20; 100) is described having two filter channels (30I, 30Q; 101I, 101q) for processing an I-input signal (phiI) and a Q-input signal (phiQ) which is shifted over 90° with respect to the I-input signal (phiI), respectively. The filter (20; 100) has at least two capacitive filter components (CI, CQ; CiI, CiQ) corresponding to each other in the two filter channels (30I, 30Q; 101I, 101Q), wherein the capacity values (C; Ci) of these two capacitive filter components (CI, CQ; CiI, CiQ) are substantially equal to each other. Said two capacitive filter components (CI, CQ; CiI, CiQ) are coupled to each other by means of two current source couplings (40QI, 40IQ; 106i) switched in anti-parallel, having substantially equal characteristic. Hereby, a displacement of the filter characteristic toward higher frequencies is achieved, over a distance OMEGAc. |
