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    3.
    发明专利
    未知

    公开(公告)号：DE69900651T2

    公开(公告)日：2002-05-29

    申请号：DE69900651

    申请日：1999-01-12

    Applicant: XEROX CORP

    Inventor： ZOMORRODI MEHRDAD

    IPC: H03F1/34 ,  H03F3/30 ,  H04N5/14 ,  H04N5/335 ,  H04N9/64

    Abstract: There is disclosed an analog video buffer which utilizes a complementary push-pull CMOS source follower video buffer with a feedback driver. The CMOS source follower provides a low impedance output node with high driving capabilities, high switching speed, and rail-to-rail linearity and the feedback driver isolates the output node from the feedback needed for the design of the video buffer to provide a transient response without ringing or overshoot.

    DIRT INSENSITIVE OPTICAL PAPER PATH SENSOR
    5.
    发明专利
    DIRT INSENSITIVE OPTICAL PAPER PATH SENSOR 未知

    公开(公告)号：CA1240754A

    公开(公告)日：1988-08-16

    申请号：CA491274

    申请日：1985-09-20

    Applicant: XEROX CORP

    Inventor： HUBBLE FRED F III ,  BULLOCK RANDOLPH A ,  CHEUNG LI-FUNG ,  CRUMRINE ROBERT E ,  MARTIN JAMES P ,  WHITE PETER P ,  ZOMORRODI MEHRDAD

    IPC: G01V8/12 ,  B65H7/14 ,  G03G15/00 ,  G01N21/86

    Abstract: The present invention is concerned with a self-adjusting document sensor compensating for degradation of the sensor system. A suitable light source and a detector are provided, the output of the detector being fed into an amplifier whose gain depends upon a feedback signal. Periodically, the output of the amplifier is compared to a reference. If the output of the amplifier falls below the reference, a pulse is sent to a ripple counter whose digital output is fed back to the amplifier to change the gain of the amplifier.If the detector is an unbiased photodiode operating in the transconductance mode, the leakage currents and their subsequent effect on output with amplifier gain changes will be minimized.

    6.
    发明专利
    未知

    公开(公告)号：DE69900651D1

    公开(公告)日：2002-02-21

    申请号：DE69900651

    申请日：1999-01-12

    Applicant: XEROX CORP

    Inventor： ZOMORRODI MEHRDAD

    IPC: H03F1/34 ,  H03F3/30 ,  H04N5/14 ,  H04N5/335 ,  H04N9/64

    Abstract: There is disclosed an analog video buffer which utilizes a complementary push-pull CMOS source follower video buffer with a feedback driver. The CMOS source follower provides a low impedance output node with high driving capabilities, high switching speed, and rail-to-rail linearity and the feedback driver isolates the output node from the feedback needed for the design of the video buffer to provide a transient response without ringing or overshoot.

    CURRENT MIRROR FOR SUPPLYING CONSTANT CURRENT TO OUTPUT LOAD IMPEDANCE IN WIDE RANGE
    10.
    发明专利
    CURRENT MIRROR FOR SUPPLYING CONSTANT CURRENT TO OUTPUT LOAD IMPEDANCE IN WIDE RANGE 失效

    公开(公告)号：JP2000201032A

    公开(公告)日：2000-07-18

    申请号：JP36232299

    申请日：1999-12-21

    Applicant: XEROX CORP

    Inventor： MCINTYRE HARRY J ,  ZOMORRODI MEHRDAD

    IPC: G05F3/26 ,  H03F3/343 ,  H03F3/345

    Abstract: PROBLEM TO BE SOLVED: To prevent the fluctuation of the output currents of a current mirror depending on the value of a load impedance while an output impedance is increased as much as possible in a conventional current mirror for generating constant currents. SOLUTION: The output of an arithmetic amplifier 24 is connected with each gate of pMOS transistors T3 and T4, and each input of the arithmetic amplifier 24 is connected with the drains of pMOS transistors T3 and T4. Thus, the voltages of the two transistors can be controlled, and the output currents of a current mirror can be maintained so as to be substantially constant against a load impedance in a wide range.

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