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    Mean power detector circuit employing a semiconductor differential amplifier on an integrated circuit chip
    1.
    发明授权
    Mean power detector circuit employing a semiconductor differential amplifier on an integrated circuit chip 失效
    在集成电路芯片上使用半导体差分放大器的平均电力检测电路

    公开(公告)号：US3576492A

    公开(公告)日：1971-04-27

    申请号：US3576492D

    申请日：1969-05-21

    Applicant: BELL TELEPHONE LABOR INC

    Inventor： RAO TADIKONDA N

    IPC: G01R21/00 ,  G01R21/02 ,  G01R5/26

    CPC classification number: G01R21/02 ,  G01R21/00

    Abstract: A mean power detector circuit utilizes a differential amplifier on an integrated circuit chip to measure the true mean power of any waveform. A suitable resistor is thermally coupled to one transistor of the amplifier and is substantially isolated from the other transistor. When the resistor is connected to the signal to be measured, the thermal dissipation in the resistor affects the volt-ampere characteristics of the transistor to which it is coupled. Changes resulting from variations in ambient conditions or transistor characteristics are rejected by the differential arrangement. Thus the output of the amplifier is a measure of the mean power of the input signal and therefore is a measure of either the mean square voltage or the mean square current of the signal source.

    Coupler for interconnecting customer equipment with telephone network
    3.
    发明授权
    Coupler for interconnecting customer equipment with telephone network 失效
    用电话网络互联客户设备的联合机

    公开(公告)号：US3602800A

    公开(公告)日：1971-08-31

    申请号：US3602800D

    申请日：1969-05-21

    Applicant: BELL TELEPHONE LABOR INC

    Inventor： FELDMAN DAVID ,  GOLEMBESKI JOHN J ,  RAO TADIKONDA N ,  WYNDRUM RALPH W JR

    IPC: H04M3/00 ,  G05F1/00 ,  G05F1/60

    CPC classification number: H04M3/005

    Abstract: A coupler for attaching customer-owned equipment to the telephone network permits any customer signal below a prescribed signal level to pass without distortion or attenuation but linearly attenuates signals exceeding the prescribed level. The coupler measures the mean power of the customer''s signal and utilizes the results to switch the proper attenuating load across the line. The switch circuit of the coupler has a hysteresis characteristic to prevent distortion of the customer''s signal by repeated switching between different alternating modes when the customer''s signal has slight variations about the prescribed threshold level.

    Differential amplifier
    4.
    发明授权
    Differential amplifier 失效

    公开(公告)号：US3564439A

    公开(公告)日：1971-02-16

    申请号：US3564439D

    申请日：1969-05-21

    Applicant: BELL TELEPHONE LABOR INC

    Inventor： RAO TADIKONDA N

    IPC: H03F3/45 ,  H03F3/68

    CPC classification number: H03F3/45479

    Abstract: A DIFFERENTIAL AMPLIFIER UTILIZES MATCHES TRANSISTOR CURRENT SOURCES IN BOTH THE EMITTER AND COLLECTOR CIRCUITS OF THE DIFFERENTIAL PAIR IN ORDER TO ACHIEVE HIGH COMMON MODE REJECTION AND DIFFERENTIAL GAIN WITHOUT SACRIFICING THE DIFFERENTIAL OUTPUT.

    High frequency gyrator circuits
    5.
    发明授权
    High frequency gyrator circuits 失效
    高频陀螺仪电路

    公开(公告)号：US3585539A

    公开(公告)日：1971-06-15

    申请号：US3585539D

    申请日：1969-04-01

    Applicant: BELL TELEPHONE LABOR INC

    Inventor： RAO TADIKONDA N

    IPC: H03H11/42 ,  H01P1/32 ,  H03H11/00

    CPC classification number: H03H11/42

    Abstract: A gyrator circuit effective at frequencies up to several tens of megacycles is formed by the parallel connection of two differential voltage-current converters each utilizing a respective pair of transistors. Simplicity is enhanced and stability at high frequencies is ensured by directly crossconnecting each of the two output transistors to an opposite one of the input transistors. The conventional need for additional transistors to effect inversion is avoided. The circuit may be connected as a replacement for a floating inductor or, alternatively, for a grounded inductor.

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