公开(公告)号：JP2002094336A

公开(公告)日：2002-03-29

申请号：JP2000277724

申请日：2000-09-13

申请人： NF CORP ,  AGILENT TECHNOLOGIES JAPAN LTD

发明人： SOFUKAWA SHINGO ,  KOMURO TAKANORI

IPC分类号： H03F3/68 ,  H03F1/32 ,  H03F1/34 ,  H03F1/42 ,  H03F3/34

摘要： PROBLEM TO BE SOLVED: To provide a cascade connected type amplifier that has a feedback from a final stage to an input stage and operates at a faster speed, while being simple in configuration. SOLUTION: The cascade connected type amplifier includes (N+1)-sets (here N is an integer 1 or larger) of amplifier circuits (Gin, G1, G2,..., GN) connected in cascade, a feedback circuit including resistors (Rin, R1, R2,..., RN) connected in series from an output of the final stage amplifier circuit in the amplifier circuits, connected in cascade to an input of the input stage amplifier circuit and N-sets of capacitors (CT1, CT2,..., CTN), that respectively connect connecting points of the resistors to N-sets of connecting points of the amplifier circuits.

公开(公告)号：JP2002057534A

公开(公告)日：2002-02-22

申请号：JP2000240539

申请日：2000-08-09

申请人： ASAHI CHEMICAL MICRO SYST

发明人： TOMIOKA KOJI ,  NAKAJIMA MAKOTO

IPC分类号： H03F3/45 ,  H03F1/02 ,  H03F1/34 ,  H03F1/42 ,  H03F3/343

摘要： PROBLEM TO BE SOLVED: To provide an amplifier circuit for widening the band of frequency characteristics while suppressing increase in current consumption and cost or the like. SOLUTION: A transconductance amplifier 11 converts an input voltage to an output current and outputs it. A source follower circuit 12 performs source follower operations with an input voltage corresponding to the output current of the transconductance amplifier 11 and a feedback current from a transconductance amplifier 13. The transconductance amplifier 13 converts the output voltage of the source follower circuit 12 to an output current and feeds this output current back to the input side of the source follower circuit 12. A current mirror circuit 14 is composed of PMOS transistors Q2 and Q3 and makes the M-fold current of a current which flows to the transistor Q2 flow to the transistor Q3. An output circuit 15 is composed of an output load resistor R2 and a load capacitor CL or the like.

公开(公告)号：JP2001144547A

公开(公告)日：2001-05-25

申请号：JP2000275461

申请日：2000-09-11

申请人： NIITANI TOSHIMITSU ,  NIITANI FUMIKO ,  NIITANI YOSHIYUKI ,  NIITANI ICHIRO ,  NIITANI TSUTOMU

发明人： NIITANI TOSHIMITSU

IPC分类号： H04R3/02 ,  H03F1/08 ,  H03F1/42 ,  H03F3/181 ,  H04M1/00 ,  H04M1/60

摘要： PROBLEM TO BE SOLVED: To provide a howling prevention circuit employing a broadband amplifier circuit that has a comparatively simple circuit configuration and can amplify a signal over a wide frequency band. SOLUTION: The howling prevention circuit employs the broadband amplifier circuit consisting of a signal discrimination circuit that eliminates the same input signal in 1st and 2nd input signals from the 1st input signal and provides an output of the result as an output signal and of an amplifier circuit for the 1st input signal that is provided with an active element having a base corresponding terminal, an emitter corresponding terminal and a collector corresponding terminal and with an input circuit where a counter ground input signal voltage of the emitter corresponding terminal is higher than that of the base corresponding terminal and where the impedance between the collector corresponding terminal and the base corresponding terminal is high for a signal frequency and an output circuit acting like a load is connected between the collector corresponding terminal and the emitter corresponding terminal.

公开(公告)号：JP2001505395A

公开(公告)日：2001-04-17

申请号：JP51758499

申请日：1998-08-17

IPC分类号： H03F1/42 ,  H03F1/02 ,  H03F3/189 ,  H03F3/345 ,  H03F3/72 ,  H04B1/18 ,  H04B1/28

公开(公告)号：JP3148841B2

公开(公告)日：2001-03-26

申请号：JP7304192

申请日：1992-02-26

IPC分类号： H03F1/02 ,  H03F1/42 ,  H03F3/26 ,  H03F3/68 ,  H03F3/72

公开(公告)号：JP3129704B2

公开(公告)日：2001-01-31

申请号：JP34120998

申请日：1998-12-01

IPC分类号： H03F1/34 ,  H03F1/22 ,  H03F1/42 ,  H03F3/30

公开(公告)号：JP3129531B2

公开(公告)日：2001-01-31

申请号：JP23669692

申请日：1992-09-04

IPC分类号： H03F1/34 ,  H03F1/22 ,  H03F1/42 ,  H03F3/30

公开(公告)号：JP3113401B2

公开(公告)日：2000-11-27

申请号：JP20524492

申请日：1992-07-31

IPC分类号： G01R13/22 ,  H03F1/30 ,  H03F1/42 ,  H03F1/48 ,  H03G3/10

公开(公告)号：JP3105846B2

公开(公告)日：2000-11-06

申请号：JP25363397

申请日：1997-09-18

IPC分类号： H03F3/60 ,  H03F1/42 ,  H03F3/189

公开(公告)号：JP2000286647A

公开(公告)日：2000-10-13

申请号：JP12904699

申请日：1999-03-31

申请人： KOJIMA SHINYA

发明人： KOJIMA SHINYA

IPC分类号： H01L31/10 ,  H03F1/34 ,  H03F1/42 ,  H03F3/08 ,  H04B10/2507 ,  H04B10/40 ,  H04B10/50 ,  H04B10/60 ,  H04B10/04 ,  H04B10/06 ,  H04B10/14 ,  H04B10/26 ,  H04B10/28

摘要： PROBLEM TO BE SOLVED: To widen the band of an optical receiver for optical communication and to improve the sensitivity of the receiver. SOLUTION: The band and sensitivity this optical receiver are simultaneously widened and improved, respectively, in such a way that the band is widened by connecting an inductance for signal amplification in series with the signal amplifying resistor of the forward voltage amplifying section of the receiver and the thermal noise produced from the resistor is reduced by appropriately setting the values of the resistor and inductance. In addition, the conventionally dominant thermal noise which is produced by the channel conductance of a field-effect transistor 1 is equivalently reduced by increasing the input impedance obtained when the gate of the transistor 1 is viewed from the detecting current iPD of a photodiode in the high-frequency range by setting the band width of a negative feedback loop narrower than that of the optical receiver or connecting a feedback inductance in series with a feedback resistor.