公开(公告)号：EP0958659A2

公开(公告)日：1999-11-24

申请号：EP98954673.0

申请日：1998-11-30

申请人： Koninklijke Philips Electronics N.V. ,  Philips Patentverwaltung GmbH

发明人： MINNIS, Brian, John ,  WAGNER, Elmar

IPC分类号： H03L7 ,  H03C3 ,  H03D7 ,  H03J1 ,  H04B1

CPC分类号： H03C3/0983 ,  H03C3/0966 ,  H03C3/406 ,  H03D7/168 ,  H03J1/0033 ,  H04B2001/0491

摘要： A transmitter in which a complex low IF digitised signal is applied in quadrature to a complex phase comparator (32) together with a digitised frequency down-converted version of an analogue signal produced by a transmitter VCO (46). The low IF digitised signal serves as a reference against which the digitised frequency down - converted version of the transmitter VCO (46) is compared. The output of the complex phase comparator (32) is converted to an analogue signal which is applied as a control signal to the transmitter VCO. An analogue embodiment of the transmitter which uses zero - IF signals is also disclosed.