公开(公告)号：CA2120679C

公开(公告)日：1998-09-22

申请号：CA2120679

申请日：1994-04-06

Applicant: MOTOROLA INC

Inventor： COLVIS CHRISTOPHER O ,  SCHWENT DALE G ,  YOCHEM DONALD M

IPC: H04B1/04 ,  H04B1/26 ,  H04B1/74 ,  H04B14/06 ,  H04L27/00 ,  H04L27/20 ,  H03F3/68 ,  H04B1/40

Abstract: The dual mode amplifier network for radiotelephone of the present invention has a first path (110) to be used in the U.S. Digital Cellular mode, and a second path (120) to be used in the FM analog cellular mode. The first path (110) has a first switch (106) coupled to the network input and to an isolator (103). A second switch (107) couples the isolator (103) to the network output. A third switch (108), in the second path (120), couples the network input to a filter (104). A fourth switch (109) couples to the filter (104) to the network output. A controller (130) closes the first switch (106) and the second switch (107) and opens the third switch (108) and the fourth switch (109) in the U.S. Digital Cellular mode. In the FM analog mode, the controller (130) opens the first switch (106) and the second switch (107) and closes the third switch (108) and the fourth switch (109).

公开(公告)号：CA2120679A1

公开(公告)日：1994-11-11

申请号：CA2120679

申请日：1994-04-06

Applicant: MOTOROLA INC

Inventor： COLVIS CHRISTOPHER O ,  SCHWENT DALE G ,  YOCHEM DONALD M

IPC: H04B1/04 ,  H04B1/26 ,  H04B1/74 ,  H04B14/06 ,  H04L27/00 ,  H04L27/20 ,  H03F3/68 ,  H04B1/40

Abstract: The dual mode amplifier network of the present invention enables a radiotelephone to operate efficiently in both the U.S. Digital Cellular mode and the FM analog cellular mode. Multiple, switched branches (110 and 120) permit one branch (110) with an isolator (103) to be used in the in the U.S. Digital Cellular mode while the other branch (120) is switched out. In the analog mode, the transmit filter branch (120) is used while the isolator branch (110) is switched out.