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61. 发明公开

EP0738040A1 Monolithic HBT active tuneable band-pass filter 失效
标题翻译：单片HBT有源可调谐带通滤波器
公开(公告)号：EP0738040A1
公开(公告)日：1996-10-16
申请号：EP96104432.8
申请日：1996-03-20
申请人： TRW INC.
发明人： Kobayashi, Keven W.
IPC分类号： H03H11/10 , H03H11/52
CPC分类号： H03H11/10 , H03H11/04 , H03H11/52
摘要： An active tuneable band-pass filter is provided which has a negative resistance circuit for generating a tuneable amount of negative resistance for a passive band-pass filter structure so as to compensate for resistive losses. The negative resistance circuit has a bipolar transistor with a base connected in shunt to the passive filter structure and a collector connected to a shunt inductive element. A negative resistance is generated at the base of the transistor and is applied to the passive filter structure. A coarse Q-factor tuning circuit is coupled to the emitter of the transistor for providing a coarse amount of tuning of the negative resistance. Also connected to the emitter terminal, is a fine tuning circuit for providing fine tuning of the negative resistance. The fine tuning may be achieved manually or automatically with a control circuit. The coarse and fine tuning capability provides a tuneable negative resistance which eliminates oscillations and compensates for resistive loss variations to realize improved q-factor.

62. 发明授权

EP0171172B1 Active filters 失效
标题翻译：主动过滤器
公开(公告)号：EP0171172B1
公开(公告)日：1989-04-12
申请号：EP85304713.2
申请日：1985-07-02
申请人： BRITISH TELECOMMUNICATIONS public limited company
发明人： Greaves, Alan John , Hunter, Phillip James
IPC分类号： H03H11/10 , H03H11/52
CPC分类号： H03H11/10 , H03H11/525

63. 发明公开

EP0295704A2 Reactance circuit 失效
标题翻译： Elektronisches Netzwerk zur Nachbildung vonBlindwiderständen。
公开(公告)号：EP0295704A2
公开(公告)日：1988-12-21
申请号：EP88109694.5
申请日：1988-06-16
申请人： SANYO ELECTRIC CO., LTD.
发明人： Ishiguro, Kazuhisa , Yamagishi, Mikio
IPC分类号： H03H11/48 , H03H11/52
CPC分类号： H03H11/48
摘要： This reactance circuit comprises a differential amplification circuit formed by differentially connecting the first (1) and second (2) transistors to each other, a load (4) connected to a collector of the first transistor, a reactance element (5) interposed between a base of the first transistor and a reference potential point (A), and a capacitor (8) and a resistor (9). connected in series between the collector and the base of the first transistor. A negative feedback loop to the first transistor is formed by the capacitor and the resistor. Accordingly, when the collector of the first transistor is used as an output terminal, a negative equivalent reactance is produced in the output terminal.
摘要翻译：该电抗电路包括通过将第一（1）和第二（2）晶体管彼此差分地连接而形成的差分放大电路，连接到第一晶体管的集电极的负载（4），置于第一晶体管的集电极之间的电抗元件（5）第一晶体管的基极和参考电位点（A），以及电容器（8）和电阻器（9）。串联连接在第一晶体管的集电极和基极之间。由电容器和电阻器形成到第一晶体管的负反馈回路。因此，当第一晶体管的集电极用作输出端时，在输出端产生负的等效电抗。

64. 发明专利

JP4662115B2 Nonlinear resistor circuit using floating gate mosfet 有权
公开(公告)号：JP4662115B2
公开(公告)日：2011-03-30
申请号：JP2003563092
申请日：2003-01-22
申请人：独立行政法人科学技術振興機構
发明人：一幸合原 , 喜彦堀尾 , 徹哉藤原
IPC分类号： H03H11/52 , H03H7/46 , H03H11/48
CPC分类号： H03H11/53 , H03H11/52

65. 发明专利

JP3809632B2 Copper resistance compensation circuit of the coil 有权
公开(公告)号：JP3809632B2
公开(公告)日：2006-08-16
申请号：JP2001182965
申请日：2001-06-18
申请人：株式会社山武
发明人：巧林
IPC分类号： H03K17/96 , H03B5/08 , H03H11/52

66. 发明专利

JP2004064283A Tuner circuit 审中-公开
公开(公告)号：JP2004064283A
公开(公告)日：2004-02-26
申请号：JP2002218036
申请日：2002-07-26
申请人： General Res Of Electronics Inc , 株式会社ゼネラルリサーチオブエレクトロニックス
发明人： KAWAI KAZUO
IPC分类号： H03J3/06 , H03H11/52
CPC分类号： H03H11/52
摘要： PROBLEM TO BE SOLVED: To provide a tuner circuit wherein a selectivity characteristic and a tuner circuit gain are unchanged and kept constant even when a tuned frequency is varied in order to improve the Q of the tuner circuit by using a negative resistor circuit.
SOLUTION: The tuner circuit is configured to compensate a series resistance component R
0+1 by connecting the negative resistor circuit N in series with a series resonance circuit M. The negative resistor circuit N comprises: a differential amplifier circuit wherein the emitters of two transistors Q
1 , Q
2 are connected in common; and a low output impedance circuit like an emitter follower Q
3 , and is configured such that an output of the low output impedance circuit is directly fed back to a noninverting input Q
2 of the differential amplifier circuit and fed back to an inverting input Q
1 via a negative resistance setting resistor R
2 , and a prescribed negative resistance is obtained between the inverting input terminals 1, 2.
COPYRIGHT: (C)2004,JPO

67. 发明专利

JP2700977B2 失效
公开(公告)号：JP2700977B2
公开(公告)日：1998-01-21
申请号：JP21724492
申请日：1992-07-22
IPC分类号： G05B19/05 , G05F1/10 , G05F1/618 , H03H11/52 , H03K19/0175 , H04L25/02

68. 发明专利

JP2685841B2 失效
公开(公告)号：JP2685841B2
公开(公告)日：1997-12-03
申请号：JP26389288
申请日：1988-10-21
IPC分类号： G06G7/60 , G06G7/163 , G06N3/063 , G11C11/54 , G11C11/56 , H01L21/331 , H01L27/10 , H01L29/73 , H01L29/737 , H03H11/52 , H03K19/177

69. 发明专利

JPH08293758A MONOLITHIC HBT TYPE ACTIVE TUNABLE BAND-PASS FILTER 失效
公开(公告)号：JPH08293758A
公开(公告)日：1996-11-05
申请号：JP8130296
申请日：1996-04-03
申请人： TRW INC
发明人： KEBUIN DABURIYUU KOBAYASHI
IPC分类号： H03H11/04 , H03H11/06 , H03H11/10 , H03H11/52
摘要： PROBLEM TO BE SOLVED: To provide an active tunable band-pass filter provided with a negative resistance circuit which generates the tunable amount of a negative resistance to a passive band-pass filter structure so as to compensate a resistance loss. SOLUTION: A negative resistance circuit 20 is provided with a bipolar transistor Q1 having a base connected to a passive filter structure through a shunt and a collector connected to a shunt guide element 32. A negative resistance is generated at the base of the transistor Q1 and impressed upon the passive filter structure. A rough Q-factor tuning circuit 36 is coupled with the emitter of the transistor Q1 and supplies a rough tuning amount of the negative resistance. In addition, a fine tuning circuit which supplies the fine tuning of the negative resistance is connected to the emitter terminal of the transistor Q1. The fine tuning is manually or automatically attained by means of a control circuit. Rough and fine tuning functions supply a tunable resistance which removes oscillations and compensates the variation of a resistance loss for realizing an improved Q-factor.

70. 发明专利

JPH0414526B2 失效
公开(公告)号：JPH0414526B2
公开(公告)日：1992-03-13
申请号：JP16933882
申请日：1982-09-27
申请人： SANYO ELECTRIC CO
发明人： TANAKA KANJI , ISHIGURO KAZUHISA
IPC分类号： H03B5/36 , H03H11/40 , H03H11/44 , H03H11/46 , H03H11/48 , H03H11/52

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