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    DIGITAL-TO-ANALOG CONVERTER
    52.
    发明专利
    DIGITAL-TO-ANALOG CONVERTER 未知

    公开(公告)号：CA1176375A

    公开(公告)日：1984-10-16

    申请号：CA392101

    申请日：1981-12-11

    Applicant: SONY CORP

    Inventor： HATA IKURO ,  TAKEDA MASASHI

    IPC: H03M1/82 ,  H03M1/00 ,  H03M1/66 ,  H03K13/20

    Abstract: 38/S01527 S81P263 DIGITAL-TO-ANALOG CONVERTER An integrating digital-to-analog converter circuit includes an operational-amplifier based integrator, a plurality of constant current sources each providing constant current at a respective different level, and a plurality of switches each associated with a respective current source for coupling the same to the integrator. A plurality of digital counters are arranged to hold a predetermined portion of an n-bit digital word loaded therein and to count clock pulses until their contents reach a predetermined count. At those times, a carry pulse is generated in each such digital counter and the associated switch is opened to cut off the associated current source. Such a digital-to-analog converter circuit can convert data words of relatively high bit length without the need for an excessively high frequency clocking signal.

    APPARATUS FOR CONTROLLING THE SPEED AND DIRECTION OF A DC MOTOR
    54.
    发明专利
    APPARATUS FOR CONTROLLING THE SPEED AND DIRECTION OF A DC MOTOR 未知

    公开(公告)号：CA1123048A

    公开(公告)日：1982-05-04

    申请号：CA320588

    申请日：1979-01-31

    Applicant: SONY CORP

    Inventor： TAKEDA MASASHI ,  HOSHIMI SUSUMU ,  SATO TOSHIO

    IPC: G05D13/62 ,  G11B19/28 ,  H02P29/00 ,  H02P6/02

    Abstract: SO1144 S79P4 APPARATUS FOR CONTROLLING THE SPEED AND DIRECTION OF ROTATION OF A DC MOTOR A single pickup head generates an alternating signal proportional to the rotational speed of a DC motor which can be rotated in either of two directions, and such alternating signal is employed by speed and/or phase control circuits to control the motor speed relative to a reference speed in a selected one of the two directions. An overspeed sensing circuit detects speed runaway, which can occur when the motor is rapidly rotated in the direction opposite to the selected direction, and the overspeed sensing circuit then interrupts the motor drive voltage until the motor speed decreases to below its normal speed. At and below normal speed in the undesired direction, the normal torque acts in the selected direction to rapidly reverse the rotational direction and to accelerate the motor to normal speed in the selected direction.

    57.
    发明专利
    未知

    公开(公告)号：DE2518558A1

    公开(公告)日：1975-11-20

    申请号：DE2518558

    申请日：1975-04-25

    Applicant: SONY CORP

    Inventor： TAKEDA MASASHI ,  MATSUZAKI ATSUSHI

    IPC: G01R19/00 ,  G01R19/04

    Abstract: A peak detector having rise-time enhancement of input signals is comprised of a feedback amplifier including two input terminals and a feedback circuit which interconnects the amplifier output terminal with one of the input terminals; and a peak detecting circuit, including a capacitor, coupled to the other of the amplifier input terminals. The capacitor voltage is applied as an input signal to the feedback amplifier, and abrupt changes in the rise-time portion of the input signals are detected and are used to vary the amplifier feedback so as to enhance the output signal produced by the amplifier during the rise-time portion.

    59.
    发明专利
    未知

    公开(公告)号：AT62093T

    公开(公告)日：1991-04-15

    申请号：AT85304513

    申请日：1985-06-25

    Applicant: SONY CORP

    Inventor： SHOJI NORIO ,  TAKEDA MASASHI

    IPC: H03K3/286 ,  H03K3/2885 ,  H03K19/086

    Abstract: Logic circuits based on a differential amplifier with the common emitters thereof being connected through a constant current source generally require the use of a reference voltage (Vr) and associated transistor for each such differential amplifier to provide the reference level against which the two inputs (A, B) are compared to obtain the necessary logic operations. … In order to eliminate the requirement for the reference voltage and the transistor, the input signals (A, B-) are selected to have the same relative amplitude difference (VL) between the high and low levels thereof and one of the two input signals is further controlled to be shifted relative to the other one by an amount equal to 1/2 such selected amplifier difference. The differential amplifier (42, 44) has a constant current source (50) and the respective output circuits (56, 66) are connected in emitter-follower configuration having constant current source resistors (60, 70) across which the output voltages are taken. By selecting the relative resistor values, the desired shift (1/2 VL) of the relative output level can be obtained. By employing additional sets of transistors in the differential amplifier, multiple inputs are accommodated and by utilizing output circuits having selected resistor value relationships, corresponding multiple outputs are obtained.

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