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1. 发明专利

JPH10242865A D/A CONVERTER AND SEMICONDUCTOR INTEGRATED CIRCUIT 失效
公开(公告)号：JPH10242865A
公开(公告)日：1998-09-11
申请号：JP4520597
申请日：1997-02-28
申请人： HITACHI LTD , HITACHI TOBU SEMICONDUCTOR LTD
发明人： OKAZAKI TAKAO , ABE YOSHITAKA , KITA MASAHITO , HASE AKIHIRO
IPC分类号： H03M1/08 , H03M1/66 , H03M3/04
摘要： PROBLEM TO BE SOLVED: To provide a D/A converter capable of improving the S/N characteristic. SOLUTION: This D/A converter is constituted of switch circuits U1-Un, D1-Dn which selectively extract a positive divided voltage output and a negative divided voltage output from a resistor circuit according to an amplitude selection signal and a differential amplifier 50 that differentially amplifies the positive divided voltage output and the negative divided voltage output extracted by the switch circuits. The positive divided voltage output and the negative divided voltage output around a reference voltage with respect to one of quantization outputs in a plurality of bits are produced from the resistor circuit 41 and they are differentially amplified to generate a specified analog voltage signal, then the S/N of the D/A converter is improved through the reducing action of a common mode noise component by the differential amplification.

2. 发明专利

JPH09153592A SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE 失效
公开(公告)号：JPH09153592A
公开(公告)日：1997-06-10
申请号：JP31183995
申请日：1995-11-30
申请人： HITACHI LTD , HITACHI TOBU SEMICONDUCTOR LTD
发明人： HANAZAWA SATOSHI , ABE YOSHITAKA , SONOBE HIROAKI
IPC分类号： H01L21/316 , H01L21/822 , H01L21/8234 , H01L21/8238 , H01L21/8249 , H01L27/04 , H01L27/06 , H01L27/092 , H03K19/003 , H03K19/08 , H03M1/76
摘要： PROBLEM TO BE SOLVED: To prevent intrusion of noise into a passive element by providing a well diffusion layer beneath an LOCOS on which the passive element is formed and feeding the well diffusion layer with a stabilized reference voltage. SOLUTION: A resistive element Rn and a capacitive element Cf are provided at a passive element part 4. The resistive element Rn is formed of a polysilicon layer 104 formed on an LOCOS 103 whereas the capacitive element Cf is formed of the polysilicon layer 104, an oxide insulation layer 105, and a wiring layer 106. A low-pass filter 5 outputs a secondary reference voltage kVref produced by correcting a primary reference voltage Vref with a specified rate (k). Intrusion of noise into a passive element is prevented by providing a well diffusion layer 102 beneath the LOCOS on which the passive element is formed and feeding the well diffusion layer 102 with a stabilized reference voltage kVref so that the potential on the well diffusion layer 102 is insusceptible to the power supply potential Vdd.

3. 发明专利

JP2007263943A Resolver/digital converter and control system using resolver/digital converter 有权
标题翻译：使用分辨率/数字转换器的分辨率/数字转换器和控制系统
公开(公告)号：JP2007263943A
公开(公告)日：2007-10-11
申请号：JP2006307317
申请日：2006-11-14
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： KANEKAWA NOBUYASU , SASAKI SHOJI , ABE YOSHITAKA
IPC分类号： G01D5/245 , G01D5/244 , H02P6/12
CPC分类号： H03M1/1004 , H03M1/1019 , H03M1/108 , H03M1/645
摘要： PROBLEM TO BE SOLVED: To provide a resolver/digital converter, having a function for self-detecting a failure without interrupting the normal operation. SOLUTION: The resolver/digital converter is provided with a normal operation function; a temperature characteristic identifying function; a first temperature characteristic correcting function for correcting an estimated angular output from the normal operation function based on a temperature characteristic identification value, obtained by the temperature characteristic identifying function; a holding function for holding the temperature characteristic identification value (1); and a second temperature characteristic correcting the function for correcting the estimated angular output from the temperature characteristic identifying function, based on the temperature characteristic identification value obtained by the temperature characteristic identifying function and held by the holding function (2). COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供一种具有自动检测故障而不中断正常操作的功能的解算器/数字转换器。解决方案：解算器/数字转换器具有正常的操作功能; 温度特性识别功能; 第一温度特性校正功能，用于基于通过温度特性识别功能获得的温度特性识别值来校正来自正常操作功能的估计角度输出; 保持温度特性识别值（1）的保持功能; 以及基于由温度特性识别功能获得并由保持功能（2）保持的温度特性识别值，校正来自温度特性识别功能的估计角度输出的功能的第二温度特性。版权所有（C）2008，JPO＆INPIT

4. 发明专利

JP2005086466A Burst optical receiving device by gain switch system 有权
标题翻译：通过增益开关系统的BURST光接收装置
公开(公告)号：JP2005086466A
公开(公告)日：2005-03-31
申请号：JP2003316185
申请日：2003-09-09
申请人： Hitachi Communication Technologies Ltd , Hitachi Ltd , 株式会社日立コミュニケーションテクノロジー , 株式会社日立製作所
发明人： TOSAKA KENJI , TAJIMI NOBURO , MORITA YOSHINOBU , ABE YOSHITAKA
IPC分类号： H04B10/07 , H04B10/272 , H04B10/293 , H04B10/40 , H04B10/50 , H04B10/524 , H04B10/564 , H04B10/572 , H04B10/58 , H04B10/60 , H04B10/69 , H04L25/03 , H04B10/04 , H04B10/06 , H04B10/14 , H04B10/26 , H04B10/28
摘要： PROBLEM TO BE SOLVED: To provide a receiving device where a wide reception dynamic range and miniaturization are attained in high speed optical burst signal reception.
SOLUTION: In the receiving device of a base station, an outer reset signal is inputted to a preamplifier, and the preamplifier switches a gain in accordance with optical burst signal intensity from each slave station. When the gain is switched, a reset signal is transmitted to ATC in a post-stage and a received signal level discrimination threshold of ATC is set again. Since the signal determination threshold of ATC in the post-stage is set again in accordance with the gain switching of the preamplifier, ATC can set an appropriate signal determination threshold corresponding to an output of the preamplifier.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供一种在高速光脉冲串信号接收中获得宽的接收动态范围和小型化的接收装置。解决方案：在基站的接收设备中，外部复位信号被输入到前置放大器，并且前置放大器根据来自每个从站的光突发信号强度切换增益。当增益被切换时，在后级将复位信号发送到ATC，再次设置ATC的接收信号电平鉴别阈值。由于根据前置放大器的增益切换再次设置后级中的ATC的信号判定阈值，所以ATC可以设置与前置放大器的输出对应的适当的信号判定阈值。版权所有（C）2005，JPO＆NCIPI

5. 发明专利

JP2001069044A HYBRID CIRCUIT AND COMMUNICATION EQUIPMENT 失效
公开(公告)号：JP2001069044A
公开(公告)日：2001-03-16
申请号：JP24163899
申请日：1999-08-27
申请人： HITACHI LTD
发明人： ABE YOSHITAKA , KITA MASAHITO
IPC分类号： H04B3/03
摘要： PROBLEM TO BE SOLVED: To decrease maximum power consumption of a termination resistor. SOLUTION: A signal to be sent to a telephone line and an output signal of 3rd amplifiers 3, 6 are summed to form a feedback loop to 2nd amplifiers 2, 5. Thus, even when a comparatively high resistance is selected for resistors R2, R5, the termination impedance is matched by increasing a gain of the feedback loop. Since the resistance is selected higher, the current consumption in the resistors can be reduced resulting in decreasing the maximum power consumption of the termination resistor. Thus, a small sized termination resistor can be employed to make a hybrid circuit 30 small in size.

6. 发明专利

JPH0774859A SUBSCRIBER LINE FEEDING SYSTEM 失效
公开(公告)号：JPH0774859A
公开(公告)日：1995-03-17
申请号：JP21939593
申请日：1993-09-03
申请人： HITACHI LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： NAGAI TOMOKAZU , KITANO JUNJIRO , ABE YOSHITAKA , UENO TAKAO , KASHIWABARA TAKAHIKO , HAYASHI TOSHIO
IPC分类号： H04B3/04 , H04M3/30 , H04M19/00
摘要： PURPOSE:To measure the line resistance of a subscriber circuit, connected to a subscriber terminal through a subscriber line, with high precision by using a small fed current, to hold a speech signal level constant according to the measured value, and to reduce the power consumption. CONSTITUTION:The subscriber circuit 1 which is connected to the subscriber terminal 3 through the subscriber line 2 is provided with a current source 4 which supplies a constant current to the terminal 3, a voltage detector 6 which detects the line voltage of the line, an arithmetic controller 7, and speech signal level adjusters 8 and 9 which make transmission characteristics of the speech signal constant; and the controller 7 varies the fed current value of the current source and the line resistance is calculated to adjust the adjusters 8 and 9, thereby holding the speech signal level constant.

7. 发明专利

JP2012209762A Level generation circuit 审中-公开
标题翻译：电平生成电路
公开(公告)号：JP2012209762A
公开(公告)日：2012-10-25
申请号：JP2011073874
申请日：2011-03-30
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： NAKAYAMA AKIRA , YOSHINAGA MAKI , ABE YOSHITAKA , HIRAYAMA NORIFUMI , HAYASHI MASAHIRO
IPC分类号： H03K19/00
CPC分类号： G05F3/20
摘要： PROBLEM TO BE SOLVED: To dispense with an external power supply for generating a gate voltage for a MOSFET operating with a grounded gate for protecting a low voltage MOSFET.SOLUTION: A level generation circuit includes: a constant current generation section for generating a first current of a constant magnitude from a first supply voltage; a first current mirror circuit section comprising a first thin film NMOSFET and a second thin film NMOSFET and outputting a second current proportional to the first current; a protection circuit section comprising a third thin film NMOSFET and a first thick film PMOSFET used with a grounded gate for protecting the second thin film NMOSFET, a first diode for preventing a backflow of current to the first power supply, and a second diode for preventing a gate-source voltage of the third thin film NMOSFET from becoming negative; a second current mirror circuit section for outputting a third current proportional to the second current; and a first Zener diode section for generating a first constant voltage from the third current.
摘要翻译：要解决的问题：省去用于产生用于保护低压MOSFET的接地栅极操作的MOSFET的栅极电压的外部电源。解决方案：电平发生电路包括：恒定电流产生部分，用于从第一电源电压产生恒定幅度的第一电流; 第一电流镜电路部分，包括第一薄膜NMOSFET和第二薄膜NMOSFET，并输出与第一电流成比例的第二电流; 保护电路部分，包括第三薄膜NMOSFET和用于保护第二薄膜NMOSFET的接地栅极的第一厚膜PMOSFET，用于防止电流回流到第一电源的第一二极管和用于防止第三薄膜NMOSFET的栅源电压变为负值; 第二电流镜电路部分，用于输出与第二电流成比例的第三电流; 以及第一齐纳二极管部分，用于从第三电流产生第一恒定电压。版权所有（C）2013，JPO＆INPIT

8. 发明专利

JP2001285046A RESET SIGNAL GENERATION CIRCUIT AND SEMICONDUCTOR INTEGRATED CIRCUIT 失效
公开(公告)号：JP2001285046A
公开(公告)日：2001-10-12
申请号：JP2000098054
申请日：2000-03-31
申请人： HITACHI LTD
发明人： KITA MASAHITO , ABE YOSHITAKA
IPC分类号： G11C11/41 , G06F1/24 , G06F12/16 , H03K17/22
摘要： PROBLEM TO BE SOLVED: To solve the problem where there is the possibility that a system malfunctions because a reset signal is not sufficiently transmitted to the entire LSI, where only a part of circuits are reset and that the remaining circuits are left without being reset since the pulse width of the generated reset signal is too short, in such a case that when a power supply voltage Vcc reduces for a relatively short time in a conventional reset signal generation circuit. SOLUTION: This reset signal generation circuit is composed of power voltage reduction detection circuits (11 and 12) for detecting the reduction of a power voltage, a time constant circuit (13) which includes a capacitive element (C0) and in which voltage is slowly changed by once discharging the electrical charge of a capacitance by a detection signal from the power voltage reduction detection circuits and then slowly charging electricity, and a level decision circuit (14) whose outputs are changed, when the charging voltage of the capacitive element becomes equal to or more than a prescribed level.

9. 发明专利

JP2000083263A EXCHANGE 失效
公开(公告)号：JP2000083263A
公开(公告)日：2000-03-21
申请号：JP25907399
申请日：1999-09-13
申请人： HITACHI LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： ABE YOSHITAKA , ARITA KAORU , ISHIZAWA AKIRA
IPC分类号： H04M19/00 , H04Q3/42
摘要： PROBLEM TO BE SOLVED: To reduce power consumption by keeping a transmission gain of a subscriber circuit constant independently of a length of a subscriber line so as to feed a constant current to a telephone terminal. SOLUTION: A subscriber circuit 9 that connects with a terminal via a subscriber line 2 and that receives/outputs a signal has a constant current feeding circuit 3 that feeds DC power by a constant current, and also it has a termination circuit 7 that is provided between an input and an output of the signal and that decides an impedance of a subscriber circuit. Then the termination circuit 7 variably sets a transfer coefficient of this termination circuit so that the combined impedance of the subscriber line and the subscriber circuit is a predetermined one.

10. 发明专利

JP2000055992A SEMICONDUCTOR INTEGRATED CIRCUIT 失效
公开(公告)号：JP2000055992A
公开(公告)日：2000-02-25
申请号：JP22222298
申请日：1998-08-06
申请人： HITACHI LTD
发明人： KITA MASAHITO , ABE YOSHITAKA
IPC分类号： G01R31/316 , G01R31/28
摘要： PROBLEM TO BE SOLVED: To shorten device test time concerning the threshold of a semiconductor integrated circuit using a reference voltage as a threshold of circuit characteristic. SOLUTION: To a semiconductor integrated circuit having a first circuit 3 using a reference voltage selected via a feedback loop as a threshold of circuit characteristic and a second circuit 4 capable of outputting the result of operation executed differently from the first circuit by way of output switches S8 to S12 from a buffer circuit 40 to an external terminal 41, a monitor switch S7 selectively conducting the reference voltage selected in the first circuit is provided. Synchronizing with the on state monitor switch S7, the selected state of the reference voltage by the first circuit can be determined corresponding to the state of the first external input terminals 34 and 45 of the first circuit and the second circuit output switch is controlled to off state.

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