公开(公告)号：EP0008913A1

公开(公告)日：1980-03-19

申请号：EP79301730.2

申请日：1979-08-23

申请人： FUJITSU LIMITED

发明人： Suzuki, Shinjiro ,  Yoshikawa, Tadashi ,  Otsuki, Tsuguo ,  Takeda, Masao ,  Kamoi, Nobuhisa ,  Satoh, Kazuo

IPC分类号： H03G1/04 ,  H03G3/30 ,  H04B1/00

CPC分类号： H04B3/145 ,  H03G1/0035 ,  H03G3/005 ,  H03G3/301

摘要： A variable level converter comprises a first variable level converting unit (110), a second variable level converting unit (120) and a grounded-emitter amplifying transistor (13) connected between them. Each of the first and second variable level converting units is comprised of an inverted L-type variable attenuator which includes a series resistor (111,121) and a variable impedance element (112,122). The second variable level converting unit includes the collector resistor (13) of the transistor circuit. Each variable impedance element is controlled by the same level control signal (Sc) and has the same electric characteristics.

公开(公告)号：EP0008913B1

公开(公告)日：1982-08-04

申请号：EP79301730.2

申请日：1979-08-23

申请人： FUJITSU LIMITED

发明人： Suzuki, Shinjiro ,  Yoshikawa, Tadashi ,  Otsuki, Tsuguo ,  Takeda, Masao ,  Kamoi, Nobuhisa ,  Satoh, Kazuo

IPC分类号： H03G1/04 ,  H03G3/30 ,  H04B1/00

CPC分类号： H04B3/145 ,  H03G1/0035 ,  H03G3/005 ,  H03G3/301