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1. 发明专利

JPS6465906A AMPLIFIER CIRCUIT 失效
公开(公告)号：JPS6465906A
公开(公告)日：1989-03-13
申请号：JP22160087
申请日：1987-09-04
申请人： HITACHI LTD , HITACHI VLSI ENG
发明人： IRIKURA SHOGO , TSUJI KOSUKE , KAMEYAMA SADAFUMI , BABA TERUYOSHI , OURA TAKAYUKI
IPC分类号： H03F3/343 , H03F3/34
摘要： PURPOSE:To reduce the dependency upon a power source voltage variation of an output voltage without being influenced on an amplification factor by making an input transistor let a current corresponding to an input voltage flow from a coupling node with a load element, and further, letting the current corresponding to the change of the power source voltage flow from said coupling node by the action of a second current source. CONSTITUTION:The second current source BCS causes a current change corresponding to the change of the power source voltage Vcc between the coupling node ND and a second power source terminal VEE, and generates a potential difference, scarecely dependent upon the change of the power source voltage Vcc, at both ends of a load resistance RL. Then, it lets the current Ibias having a tendency to cancel the voltage difference variation of both ends of the load resistance RL according to the variation of the power source voltage Vcc flow. Namely, it the power source voltage Vcc is raised or lowered higher/lower than a reference potential, the current Ibias is increased or decreased by a portion necessitated to cancel the rise portion of the drop portion of the output voltage Vout according to the change of the power source voltage Vcc. Accordingly, the dependency upon the power source voltage variation of the output voltage is lowered without being influenced upon the amplification factor.

2. 发明专利

JPH0330516A PHASE LOCKED LOOP CIRCUIT 失效
公开(公告)号：JPH0330516A
公开(公告)日：1991-02-08
申请号：JP16398389
申请日：1989-06-28
申请人： HITACHI LTD , HITACHI VLSI ENG
发明人： IRIKURA SHOGO
IPC分类号： H03L7/089 , H03L7/08
摘要： PURPOSE:To suppress an input direct current voltage to be lowered by a leaked current and to reduce phase error by constituting a phase locked loop circuit by providing a comparison control part to execute input direct current voltage control in one period of a long period signal by plural times. CONSTITUTION:A phase comparison control part 36 controls an input direct current voltage 31 of a voltage control oscillator(VCO) 28 in one period of the long period signal by the plural times. An output signal 40 of the phase comparison control part 36 becomes a pulse signal synchronous with the rise timing of a short period signal and the both rise and fall timing of the long period signal and the period is almost fixed. Such a pulse signal is inputted to a D latch circuit 22 as the output signal 40 of the comparison control part 36. Thus, even when the long period signal is inputted, the input direct current voltage 31 is controlled at the same short intervals as the case of the short period signal. As a result, the phase error caused by the leaked current of the phase looked loop circuit is reduced less than the conventional circuit.

3. 发明专利

JPH02144871A SOCKET FOR FITTING IC 失效
公开(公告)号：JPH02144871A
公开(公告)日：1990-06-04
申请号：JP29812388
申请日：1988-11-28
申请人： HITACHI LTD , HITACHI VLSI ENG
发明人： TSUJI KOSUKE , KAMEYAMA SADAFUMI , IRIKURA SHOGO , BABA TERUYOSHI , OURAKI TAKAYUKI
IPC分类号： H01R33/76 , H05K1/18
摘要： PURPOSE:To prevent the oscillation of an IC by extracting a fitting lead to the wiring board of a socket from the contact position between an IC lead and a U-shaped contact section to be brought into contact with the IC lead. CONSTITUTION:A U-shaped contact section 10 is set to the lateral direction, and a socket lead 5 is provided on the bottom face of the movable side 10B of the contact section 10 and below the contact position between an IC lead 9 and the contact section 10. The socket lead 5 is extracted from the position in contact with the IC lead 9. An IC can be neared to the directly fitted state to a wiring board 11, and the inductance component is further decreased. When a bypass capacitor is added, its effect is exerted, and oscillation can be prevented.

4. 发明专利

JPH06268301A SEMICONDUCTOR DEVICE 失效
公开(公告)号：JPH06268301A
公开(公告)日：1994-09-22
申请号：JP8146293
申请日：1993-03-16
申请人： HITACHI LTD , HITACHI VLSI ENG
发明人： HIKASA KAZUHIKO , IRIKURA SHOGO
IPC分类号： G11B7/125 , H01S5/042 , H01S3/096
摘要： PURPOSE:To suppress overshoot noise due to laser diode by feeding ON current to a first transistor while preventing suction of load bias current. CONSTITUTION:After turn ON of a transistor T6 before turn ON of a transistor T3, a transistor T4 in the current supply circuit CS of a laser diode driver LDD is turned ON to feed a predetermined current IC. The current IC is sucked through the transistor T6 being turned ON thus producing a current for perfectly turning the transistor T6 ON. Consequently, a driving current IL corresponding to IB+IA flows constantly through a laser diode LD even during an interval after turn ON of the transistor T6 and before turn ON of the transistor T3. Furthermore, the transistor T6 is fed with sufficient ON current and approaches perfect ON state quickly.

5. 发明专利

JPH06216447A LASER CURRENT DRIVE CIRCUIT 失效
公开(公告)号：JPH06216447A
公开(公告)日：1994-08-05
申请号：JP737593
申请日：1993-01-20
申请人： HITACHI LTD , HITACHI VLSI ENG
发明人： KAWAKUBO YOSUKE , IRIKURA SHOGO
IPC分类号： H01S5/042 , H01S3/096
摘要： PURPOSE:To produce an offsetless laser current at a high speed in a source type laser current drive circuit in which a difference between a source current and a sink current makes an output current. CONSTITUTION:A sink current is so set as to be always higher than a source current 13 to input currents 16, 17 generated by switching a transistor 5 to a current path switching circuit made up of a transistor 9 and diodes 10, 11 provided in the front stage of a laser diode 12, thereby being able to produce an offsetless source current pulse because a sink direction current 16 generated when the transistor 5 is turned on is not discharged to a laser diode 12. Thereby, an offset current is prevented from being superimposed on a laser current.

6. 发明专利

JPS62237809A PHASE COMPARATOR 失效
公开(公告)号：JPS62237809A
公开(公告)日：1987-10-17
申请号：JP7997886
申请日：1986-04-09
申请人： HITACHI LTD , HITACHI VLSI ENG
发明人： HIRAI MASATO , IRIKURA SHOGO
IPC分类号： H03K5/26 , H03L7/08 , H03L7/089 , H04L7/02 , H04L7/033
摘要： PURPOSE:To obtain a phase comparator having equal UP/DOWN pulse width by using three logic elements of one kind having the same delay time. CONSTITUTION:FFs 21, 22, 26 are D edge trigger FFs, an UP signal 11 goes to an H level in a time T0 after the leading edge of a data 8, a DOWN signal 12 goes to an H level in a time T0 after the leading edge of a clock 18 and the UP signal 11 goes to an L level after a time T1 further. A Reset DOWN signal 25 goes to an L level in a time T0 after the leading of an inversion 27 of the clock 18 and the DOWN signal 12 goes to an L level after the time T1, then a series of operation is finished. In comparing the pulse width of the UP signal 11 and the DOWN signal 12, the delay time till the leading edge is T0 and the delay time up to the trailing is T0+T1, and the duty cycle of the clock 18 is 50%, and when the phase difference between the clocks 18, 27 is 180 deg., both the pulse widths are equal to each other.

7. 发明专利

JPS62165958A SOCKET FOR MEASURING ELECTRIC CHARACTERISTICS OF SEMICONDUCTOR DEVICE 失效
公开(公告)号：JPS62165958A
公开(公告)日：1987-07-22
申请号：JP646286
申请日：1986-01-17
申请人： HITACHI VLSI ENG , HITACHI LTD
发明人： BABA TERUYOSHI , MIZUE KATSUYA , SONODA YASUHIRO , OURA TAKAYUKI , IRIKURA SHOGO
IPC分类号： G01R31/26 , G01R31/28 , H01L23/32 , H01R33/76
摘要： PURPOSE:To accurately measure the high frequency characteristics and the like of a semiconductor device by so composing that forces are operated to the inserting and perpendicular directions of the device to connect its lead pin to a socket. CONSTITUTION:When the electrode 12B of a chip carrier 12 is placed on the end 10A of the lead pin 10 provided at a socket body 15 and a cover 11 is closed, the pin 10 is engaged with the groove 12A on the side of the carrier 12, the electrode 12B is pressed by the end 10A of the pin to a carrier inserting direction and a perpendicular direction, supported by a supporting portion 12C, and mechanically and electrically effectively bonded. When the lower portion 10D of the pin is linearly minimized in size, the electric capacity, inductance and resistance value of the socket can be reduced to minimize the influence at the time of measuring characteristics.

8. 发明专利

JP2007243510A Optical signal receiving circuit and optical signal receiving device using it 有权
标题翻译：光信号接收电路和光信号接收设备使用它
公开(公告)号：JP2007243510A
公开(公告)日：2007-09-20
申请号：JP2006061996
申请日：2006-03-08
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： TAKAHASHI HIDEYUKI , YOSHIOKA HIROYUKI , YOSHIDA HIDEFUMI , IRIKURA SHOGO
IPC分类号： H03F3/08 , H04B10/2507 , H04B10/40 , H04B10/50 , H04B10/60
CPC分类号： H04B10/66
摘要： PROBLEM TO BE SOLVED: To realize both a bandwidth and a dynamic range which are difficult to realize in low power voltage.
SOLUTION: The circuit has a current voltage conversion circuit 10 which receives an output current signal of an optical current conversion circuit (PD) which receives an optical signal, converts it to a voltage signal, and makes it easy to set operation voltage in the circuit using resisters as a current source in a differential circuit 50 used in the poststage. Reference potential used as another input of the differential circuit 50 is composed to be created from an output voltage signal of the current voltage conversion circuit 10 by a circuit 60, so as to avoid asymmetric influence of an output waveform of the differential circuit 50 by the method.
COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：实现在低功率电压下难以实现的带宽和动态范围。解决方案：电路具有电流电压转换电路10，其接收接收光信号的光电流转换电路（PD）的输出电流信号，将其转换为电压信号，并且使得容易设置操作电压在使用电阻器的电路中作为在后级中使用的差分电路50中的电流源。用作差分电路50的另一个输入的参考电位由电路60由当前电压转换电路10的输出电压信号构成，以避免差动电路50的输出波形的不对称影响方法。版权所有（C）2007，JPO＆INPIT

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