公开(公告)号：EP0015719A1

公开(公告)日：1980-09-17

申请号：EP80300599.0

申请日：1980-02-28

申请人： THE POST OFFICE

发明人： Greaves, Alan John ,  Greenaway, Philip Ernest ,  Nightingale, Charles

IPC分类号： H03H11/10 ,  H03H11/52

CPC分类号： H03H11/10 ,  H03H11/52 ,  H03H11/525

摘要： A filter network that exhibits a bandstop response comprises a network of basically low-pass or high-pass structure. The network is developed by choosing a bandstop transfer function, a fourth-order elliptic is disclosed, which is converted to a low-pass function. This function describes a passive low-pass LC ladder network including a negative impedance element. A Bruton transformation is applied to the passive LC network to give an active version including an ungrounded negative resistance network (24) in a series arm and frequency-dependent negative resistances (36) and (38) in shunt arms without requiring inductance coils for its implementation.

公开(公告)号：EP0015719B1

公开(公告)日：1983-06-22

申请号：EP80300599.0

申请日：1980-02-28

申请人： THE POST OFFICE

发明人： Greaves, Alan John ,  Greenaway, Philip Ernest ,  Nightingale, Charles

IPC分类号： H03H11/10 ,  H03H11/52

CPC分类号： H03H11/10 ,  H03H11/52 ,  H03H11/525