公开(公告)号：EP1425857A4

公开(公告)日：2004-12-15

申请号：EP02773190

申请日：2002-08-14

申请人： ADC BROADBAND ACCESS SYS INC

发明人： UNGER DAVID ,  ENGELSE WILLEM ,  CORLEY WILLIAM ,  DAVIES DAVID ,  DORMITZER PAUL ,  ROBIDOUX RAYMOND

IPC分类号： H03H17/00 ,  H03D7/00 ,  H03H17/06 ,  H03M3/00 ,  H03D3/00 ,  H03D7/16 ,  H03M3/02 ,  H03M7/00

CPC分类号： H03H17/0685 ,  H03D7/00 ,  H03H17/0657 ,  H03H17/0664

摘要： A digital down converter (100) is provided. The digital down converter (100) includes an input adapted (102) to receive an input signal (101), a mixer circuit (104) coupled to the input to down converter the input signal, and a decimation circuit (115) coupled to the mixer. The decimation circuit is adapted to decimate down converter signal by a factor selected based on a characteristic of the input signal. The digital down converter further includes a signal conditioning circuit (118), coupled to the output of the decimation circuit (115), that conditions the decimated signal, an interpolator (120) coupled to the decimation circuit, that increase the number of samples in the conditioned signal, and a second mixer circuit (126), coupled to the interpolator, the second mixer circuit adapted to modulate a carried with the conditioned signal.