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138 条记录 (耗时 0.017 秒)

    Circuit de pompe de charge, destiné à être utilisée dans une boucle de réglage de fréquence d'un synthétiseur de fréquence
    85.
    发明公开
    Circuit de pompe de charge, destiné à être utilisée dans une boucle de réglage de fréquence d'un synthétiseur de fréquence 失效
    常见问题解答常见问题

    公开(公告)号：EP0851588A1

    公开(公告)日：1998-07-01

    申请号：EP97204002.6

    申请日：1997-12-18

    申请人： Philips Electronics N.V.

    发明人： Ridgers, Timothy

    IPC分类号： H03L7/089 ,  H03K17/66

    CPC分类号： H03K17/667 ,  H03K19/086 ,  H03L7/0896

    摘要： La pompe de charge pouvant être réalisée en circuit intégré comporte un étage de sortie fait d'une source (SCE) de courant de charge basique (52), et d'une source (SNK) de courant de décharge basique (51) de construction identique. Un signal de référence (CKreF) est amené à une bascule (40A) de type D, et un signal d'oscillateur local (CKvar) est amené à une autre bascule (40B) de même type. La sortie (28,27) de la bascule (40A,40B) déclenche un circuit de commande (30A,30B) dont la sortie (C-SCE,C-SNK) commande la source de courant (SCE,SNK).
    Les entrées d'une porte logique (60) sont reliées aux circuits de commande (30A,30B), la porte fournit aux bascules (40A,40B) et aux circuits de commande (30) un signal de remise dans un état inactif.
    Des tensions de polarisation communes aux circuits de commande sont générées par un circuit (20), qui fixe en outre le courant unité de sortie de la pompe de charge.
    Les éléments utilités dans le circuit ont donc des sources de bruit corrélées qui s'annulent et la qualité du signal de sortie est améliorée.

    Applications : télévision, radio, radio-téléphonie

    摘要翻译： 电路位于调节回路中。 本地（CKvar）和参考（CKref）振荡器的时钟D型触发器（40A，40B）的输出被馈送到控制电路（30A，30B）。 这些输出控制充电电流源（CSE）和放电电流源（SNK）。 电荷转移与相位误差成比例。 OR门（60）从表示充电和放电电流源的导通结束的控制电路接收信号（END-A，END-B）。 当电流源电流同时存在时，栅极输出连接到触发器以使它们与控制电路一起不激活，从而在控制电路中切换级联的晶体管。

    SCHALTUNGSANORDNUNG ZUR UMKEHRUNG EINES MAGNETFELDES
    87.
    发明授权
    SCHALTUNGSANORDNUNG ZUR UMKEHRUNG EINES MAGNETFELDES 失效
    电路是否反转中的磁场。

    公开(公告)号：EP0561775B1

    公开(公告)日：1995-02-15

    申请号：EP90900803.9

    申请日：1989-11-17

    申请人： Deutsche Thomson-Brandt GmbH

    发明人： ZUCKER, Friedhelm ,  BÜCHLER, Christian

    IPC分类号： G11B11/10 ,  H03K17/66 ,  H03K17/04

    CPC分类号： G11B5/02 ,  G11B11/10508 ,  H03K17/04 ,  H03K17/662

    摘要： Magneto-optical recording and reproducing equipment contains an electromagnet which reverses the magnetization of the magneto-optical layer of the magneto-optical disk in function of the bits to be stored. To ensure rapid and reliable reversal of the magnetic field, an oscillating circuit comprising a coil (L) and a capacitor (C), which is connected in parallel to a series circuit consisting of two diodes (D1, D2) of opposite polarity, is provided. Each diode (D1, D2) can be bridged by a controllable switch (S1, S2). Each connection (A, B) of the oscillating circuit can be connected, by a series circuit consisting of a resistor (R1, R2) and acontrollable switch (S3, S4), to one pole of a voltage source (+U), the other pole of which is connected to the common function of the two diodes (D1, D2). The two connections (A, B) of the oscillating circuit can also be connected to one electrode of a diode (D3, D4, respectively), the other electrode of which is connected, by a controllable switch (S3, S4), with one pole of a supply voltage source (-U) and, by a series circuit consisting of an inductance (L2, L3) and a resistor (R1, R2), to the other pole of the supply voltage source (-U). A control circuit (S) controls the controllable switches (S1-S4) in such a way that energy is supplied to the oscillating circuit when the capacitor (C) is discharged. Application: magnetic and magneto-optical equipment.

    CAPACITIVE LOAD DRIVING CIRCUIT
    88.
    发明公开
    CAPACITIVE LOAD DRIVING CIRCUIT 失效
    电容负载驱动电路

    公开(公告)号：EP0544917A4

    公开(公告)日：1994-11-17

    申请号：EP92912448

    申请日：1992-06-22

    申请人： CITIZEN WATCH CO LTD

    发明人： EBIHARA HEIHACHIRO

    IPC分类号： G09G3/36 ,  H03F3/30 ,  H03K5/02 ,  H03K19/013 ,  H03K19/018 ,  H03K17/66

    CPC分类号： G09G3/3696 ,  G09G2320/0209 ,  H03F3/3066 ,  H03K5/02 ,  H03K19/013 ,  H03K19/0136 ,  H03K19/01825

    摘要： A capacitive load driving circuit for amplifying a spike-like signal at a high-speed and obtaining a high-voltage large current load, wherein a booster of a low consumption current is used. In the circuit, two transistors (104, 111) are interconnected in series between a first power supply (H1) and a second power supply (L1) whose potential is lower than that of the first power supply, and an output terminal (OUT) is provided at the joint at which the two transistors are connected. The first transistor (104) connected between the first power supply and the output terminal, and the second transistor (111) connected between the output terminal and the second power supply are so selected that they are complementary to each other. The first transistor (104) is a PNP bipolar transistor or a P-type field effect transistor, and on the other hand, the second transistor (111) is an NPN-type bipolar transistor or an N-type field effect transistor. Further, provided between the control terminals of the respective transistors and an input terminal part (IN) are two parallel circuits each comprising a means for giving a bias to the control terminal and a capacitor.

    Magnetic head driving apparatus and magnetooptical recording apparatus
    89.
    发明公开
    Magnetic head driving apparatus and magnetooptical recording apparatus 失效
    磁头驱动装置和磁光记录装置

    公开(公告)号：EP0622792A2

    公开(公告)日：1994-11-02

    申请号：EP94302162.6

    申请日：1994-03-25

    申请人： CANON KABUSHIKI KAISHA

    发明人： Ishii, Kazuyoshi

    IPC分类号： G11B11/10 ,  H03K17/687 ,  H03K17/66

    CPC分类号： H03K17/6871 ,  G11B11/10508

    摘要： A magnetic head driving apparatus is provided with a pair of switch elements for switching a direction of a current to be supplied to a magnetic head. ON/OFF operations of the pair of switch elements are controlled in correspondence with an information signal to be recorded so as to modulate a magnetic field generated by the magnetic head in accordance with the information signal. A predetermined time difference is provided between an ON operation of one switch element and an OFF operation of the other switch element of the pair of switch elements.

    摘要翻译： 一种磁头驱动装置设有一对开关元件，用于切换要提供给磁头的电流的方向。 根据要记录的信息信号控制一对开关元件的开/关操作，以根据信息信号调制由磁头产生的磁场。 在一个开关元件的接通操作和一对开关元件中的另一个开关元件的断开操作之间提供预定的时间差。