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1. 发明专利

JPS5537019A SWITCHED CAPACITOR FILTER 失效
公开(公告)号：JPS5537019A
公开(公告)日：1980-03-14
申请号：JP10968478
申请日：1978-09-08
申请人： FUJITSU LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： KATOU SEIJI , UENO NORIO , MATSUZAKI SHINPEI , IWATA ATSUSHI
IPC分类号： H03H19/00 , H03H17/02
摘要： PURPOSE:To reduce the delay of signal and obtain the attenuation property of good filtering by carrying out the timing of ON and OFF of the respective stage switch alternatingly. CONSTITUTION:ON and OF of switching of the capacitors of the longitudinally connected integrators 2a, 2b are alternatingly carried out with the sampling of the signals of the respective stage integrators having the phases shifted by using the two phase clock pulses phi1, phi2. Namely, the output of the first stage integrator 2a is sampled by the post integrator 2b after the time of 1/2 clock. The post integrator 2b has the output signal sampled by the first stage integrator 2a through the return circuit after 1/2 clock time. Accordingly, the delay of the signal generated in the respective stages is 1/2 clock time.

2. 发明专利

JPS58130610A CRYSTAL SELECTING METHOD 失效
公开(公告)号：JPS58130610A
公开(公告)日：1983-08-04
申请号：JP1300982
申请日：1982-01-29
申请人： FUJITSU LTD
发明人： MATSUZAKI SHINPEI , OKAMURA HAJIME
IPC分类号： H03H3/02 , H03H3/04
摘要： PURPOSE:To realize a crystal selecting method by which the yield of crystal is improved, by combining two crystals for a Jaumann type 2-stage crystal band- pass filter so that the sum of loss coefficients of these two crystals is constant regardless of a temperature change. CONSTITUTION:The Q and loss coefficient (r) of a crystal X' of the 1st stage are defined as Q1 and r1 respectively; and at the same time the Q and (r) of the crystal X' of the 2nd stage are defined as Q2 and r2 respectively. Therefore the loss of the center frequency of a pass band is defined as b=20log (1+r1+r2). Thus it is not always necessary to reduce the temperature changes of the coefficients r1 and r2. Then the temperature changes due to a loss of the center frequency of a pass band is eliminated by combining a fixed sum r1+r2 although the coefficients r1 and r2 have considerably large fluctuations. As a result, the yield of crystal is improved.

3. 发明专利

JPS5591227A SWITCHED CAPACITOR FILTER 失效
公开(公告)号：JPS5591227A
公开(公告)日：1980-07-10
申请号：JP16497778
申请日：1978-12-28
申请人： FUJITSU LTD
发明人： UENO NORIO , KATOU SEIJI , MATSUZAKI SHINPEI , TSUNOISHI MITSUO
IPC分类号： H03H19/00
摘要： PURPOSE:To realize a higher-degree switched capacitor filter in the economical way by giving the multiple passing to the signals in the time shared and repetitive way. CONSTITUTION:The switched capacitor filter operates in time ta and in the state under which CB11, CB21 and CB31 are selected as the integrated capacitors each. And the output of operational amplifier AMP3 at the final stage is charged to switched capacitor Cc. Then integrated capacitors CB12, CB22 and CB32 are selected in time tb, and capacitor Cc holds its charge for time te, and the charge is fed back to input- stage operational amplifier AMP1 for time tf to be then discharged to capacitor CB12. In time tc switched capacitor CA1 is connected to the input of AMP1 and operates with the terminal voltage of CA1 used as the input.

4. 发明专利

JPS5563115A SIGNAL DETECTION CIRCUIT FOR CCD FILTER 失效
公开(公告)号：JPS5563115A
公开(公告)日：1980-05-13
申请号：JP13531778
申请日：1978-11-02
申请人： FUJITSU LTD
发明人： KATOU SEIJI , UENO NORIO , MATSUZAKI SHINPEI , TSUNOISHI MITSUO
IPC分类号： H03H15/02 , H03H15/00
摘要： PURPOSE:To decrease necessary number of the operational amplifiers in order to realize the simplification, the economization and the facilitation for the integrated circuit by securing the opposite-phase operation between the 1st/3rd switching elements and the 2nd/4th switching elements. CONSTITUTION:One of driving pulses phiA and phiB features ''H'' with the other at ''L'' respectively. And transistors TrQ4, Q5 and Q8 functioning at the switching elements are turned on by pulse phiA; while TrQ6, Q7 and Q9 functioning as the switching elements are turned on by pulse phiB to feature the opposite-phase operation to each other. When phiA becomes ''H'' with TrQ4, Q5 and Q8 are turned on, the output voltage of operational amplifiers OP1 and OP2 are applied to capacitor C4. Thus charge Q4=(V1-V2)C4 and output voltage V5 of operational amplifier OP5 are applied to capacitors C4 and C5 respectively to secure the storage of charge Q5= V5.C5. After this, when phiA and phiB turns to ''L'' and ''H'' respectively, DELTAQ4 and DELTAQ5 are added to storage charge Q6=V5.C6 of capacitor C6. In this case, if C4= C5=C6 is satisfied, V5 means the difference between output voltage V1 and V2 of OP1 and OP2.

5. 发明专利

JPS5922405B2 失效
公开(公告)号：JPS5922405B2
公开(公告)日：1984-05-26
申请号：JP7448774
申请日：1974-06-29
申请人： FUJITSU LTD
发明人： YANAGI YOSHINORI , MATSUZAKI SHINPEI , ENDO MITSUAKI
IPC分类号： H03H11/04 , H03H11/12

6. 发明专利

JPS5843608A AMPLITUDE EQUALIZER 失效
公开(公告)号：JPS5843608A
公开(公告)日：1983-03-14
申请号：JP14188781
申请日：1981-09-09
申请人： FUJITSU LTD
发明人： MATSUZAKI SHINPEI , KUSAKA SATOSHI
IPC分类号： H03H7/07 , H03H7/54 , H04B3/14
摘要： PURPOSE:To compensate a loss variation due to a temperature variation in the vicinity of a passing band of a filter having the sharp characteristics, by substituting a thermistor for a resistance of a time constant circuit part, and making it have the characteristics of temperature dependence. CONSTITUTION:A circuit having a thermistor Th is substituted for a resistance R11 or R12 of a time constant circuit, and the extent of variation of loss due to a temperature is controlled by suitably selecting a distribution of resistance Ra, Rb. Whether the circuit having the thirmistor Th is substituted for the resistance R11 or R12 is selected by watching a variation due to a temperature of loss in the vicinity of frequency corresponding to 50Hz of a broadcasting signal BPF. In this case, when a value of the resistance R12 becomes small, loss of 50Hz becomes small, and when a value of the resistance R11 becomes small, the loss of 50Hz become large. Accordingly, by taking notice of this point and also watching a direction of variation due to a temperature in the vicinity of frequency corresponding to 50Hz, whether the thermistor Th has a positive or negative temperature coefficient is selected so that the most suitable one can be obtained. In this way, not only the temperature characteristics but also the amplitude characteristics can be flattened, and also a fixed loss is scarcely increased.

7. 发明专利

JPS513831A NODO RC FUIRUTA 失效
公开(公告)号：JPS513831A
公开(公告)日：1976-01-13
申请号：JP7448774
申请日：1974-06-29
申请人： FUJITSU LTD
发明人： YANAGI YOSHINORI , MATSUZAKI SHINPEI , ENDO MITSUAKI
IPC分类号： H03H11/04 , H03H11/12

8. 发明专利

JPS6332294B2 失效
公开(公告)号：JPS6332294B2
公开(公告)日：1988-06-29
申请号：JP3218780
申请日：1980-03-14
申请人： FUJITSU LTD
发明人： MATSUZAKI SHINPEI , KANEKO KAZUHIRO
IPC分类号： H03H7/01 , H04B3/40

9. 发明专利

JPS5789336A LINE EQUALIZER 失效
公开(公告)号：JPS5789336A
公开(公告)日：1982-06-03
申请号：JP16615680
申请日：1980-11-26
申请人： FUJITSU LTD
发明人： MATSUZAKI SHINPEI , KANEKO KAZUHIRO , ISHIZAKA TAEKO
IPC分类号： H04B3/04 , H03H11/04 , H04B3/14
摘要： PURPOSE:To improve S/N and omit one operational amplifier, by using an input amplifier of the common part as one stage of an equalizing circuit. CONSTITUTION:A series circuit of switching terminals ta and tb, a capacitor C, and a resistance R is provided in one input side of an operational amplifier OP. When the operational amplifier OP is used as a buffer amplifier, switching terminals ta and tb are opened; and when it is used as the first stage of a line equalizer with the first-stage circuit eliminated, switching terminals ta and tb are connected, and a prescribed frequency characteristic is given by the capacitor C and the resistance R.

10. 发明专利

JPS5679518A BANDDPASS TYPE ACTIVE FILTER 失效
公开(公告)号：JPS5679518A
公开(公告)日：1981-06-30
申请号：JP15600679
申请日：1979-11-30
申请人： FUJITSU LTD
发明人： KANEKO KAZUHIRO , MATSUZAKI SHINPEI
IPC分类号： H03H11/12
摘要： PURPOSE:To save amplifying circuit and to decrease the space and power consumption, by directly connecting the primary and secondary circuits without buffer means. CONSTITUTION:The primary low-pass filter consisting of a resistor 1 and a capacitor 2, and the secondary high pass-filter consisting of resistors 6, 7, capacitors 4, 5 and amplifier 8, are directly connected to constitute a band-pass type active filter. In this case, the amplifier 8 separates the primary low-pass filter from the secondary high-pass filter, and the circuit constant is selected to have a prescribed characteristic.

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