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9 条记录 (耗时 0.011 秒)

    Second stage overload protection for amplifiers
    1.
    发明授权
    Second stage overload protection for amplifiers 失效
    放大器第二级过载保护

    公开(公告)号：US3864642A

    公开(公告)日：1975-02-04

    申请号：US35104773

    申请日：1973-04-13

    申请人： MOTOROLA INC

    发明人： LONG ERNEST L ,  RUSSELL RONALD W ,  SOLOMON JAMES E

    IPC分类号： H03F1/52 ,  H03F3/30 ,  H03F21/00

    CPC分类号： H03F3/3071 ,  H03F1/52

    摘要： There is disclosed second stage overload protection for amplifiers in which the connection between the second stage and the third stage incorporates a resistive element which is effectively switched to a high value to limit the output current of the second stage whenever a short or a high load occurs at the output of the device. The transistor in the second stage is simultaneously placed in saturation so that it no longer performs an amplification function such that the current drawn when the second stage is in saturation is considerably less than the current drawn when the second stage is in its active region, thus protecting the second stage from current overloading.

    摘要翻译： 公开了用于放大器的第二级过载保护，其中第二级和第三级之间的连接包含电阻元件，电阻元件有效地切换到高值，以限制每当出现短或高负载时的第二级的输出电流 在设备的输出端。 第二级中的晶体管同时置于饱和状态，使得其不再执行放大功能，使得当第二级处于饱和状态时所绘制的电流显着小于当第二级处于其有源区域时所绘制的电流，因此 保护第二阶段免受目前的超载。

    Automatic gain control rf-if amplifier
    2.
    发明授权
    Automatic gain control rf-if amplifier 失效
    自动增益控制RF-IF放大器

    公开(公告)号：US3684974A

    公开(公告)日：1972-08-15

    申请号：US3684974D

    申请日：1968-01-29

    申请人： MOTOROLA INC

    发明人： SOLOMON JAMES E ,  DAVIS WALTER RICHARD

    IPC分类号： H03G1/00

    CPC分类号： H03G1/0023

    摘要： Disclosed is a differential amplifier circuit featuring electronic gain control, and this circuit may be constructed in monolithic integrated form. In one embodiment of the invention, first and second pairs of differentially coupled transistors are connected respectively to first and second differentially coupled input transistors, and the input transistors are connectable to a source of differential input signals. Differential output signals are derived at the outputs of transistors in each of the pairs of transistors, and by applying an automatic gain control (AGC) signal at a node which is common to the transistor pairs, electronic gain control is obtained without a differential signal arising therefrom. In another embodiment of the invention, an output differential amplifier stage is directly coupled to transistors in the first and second pairs of transistors so that any common mode signal present there is rejected in said output stage.

    Temperature stable monolithic multiplier circuit
    7.
    发明授权
    Temperature stable monolithic multiplier circuit 失效
    温度稳定的单片多路复用电路

    公开(公告)号：US3668440A

    公开(公告)日：1972-06-06

    申请号：US3668440D

    申请日：1970-10-16

    申请人： MOTOROLA INC

    发明人： DAVIS WALTER RICHARD ,  SOLOMON JAMES E

    IPC分类号： G06G7/16 ,  H03B19/14 ,  H03C1/54 ,  H03D13/00 ,  H03F3/45 ,  H03G1/00 ,  H03K17/14

    CPC分类号： H03G1/0023 ,  G06G7/16 ,  H03B19/14 ,  H03C1/542 ,  H03D13/008 ,  H03D2200/0009 ,  H03F3/45479 ,  H03F2203/45508

    摘要： A monolithic four-quadrant multiplier circuit, the output off which is subject to variations caused by changes in beta ( Beta ) due to changes in temperature, is temperature compensated by providing operating current thereto from a regulating circuit which causes the operating current for the multiplier to vary in accordance with a predetermined alpha ( Alpha ) relationship to cancel out the effect of changes in Beta on the multiplier output. A level shifting circuit is connected to the output of the multiplier and causes the output of the multiplier to be referenced to ground. In addition, the level shifting circuit includes roll-off filter circuits to prevent high frequency signals from passing to the output terminals over paths which would subject the signals to large amounts of phase shift.

    摘要翻译： 由于温度变化导致的β（β）变化引起的变化的单片四象限乘法器电路通过从调节电路提供工作电流来补偿温度，该调节电路导致乘法器的工作电流 根据预定的α（α）关系来改变，以消除β对乘法器输出的变化的影响。 电平移位电路连接到乘法器的输出，并使乘法器的输出参考地。 此外，电平移位电路包括滚降滤波器电路，以防止高频信号通过将使信号进行大量相移的路径到达输出端。

    Gated differential gain control circuit for a television receiver
    8.
    发明授权
    Gated differential gain control circuit for a television receiver 失效
    电视接收机的差分增益控制电路

    公开(公告)号：US3598902A

    公开(公告)日：1971-08-10

    申请号：US3598902D

    申请日：1969-06-11

    申请人： MOTOROLA INC

    发明人： DAVIS WALTER R ,  LUNN GERALD K ,  SOLOMON JAMES E

    IPC分类号： H04N5/52 ,  H03G3/20 ,  H04N5/53

    CPC分类号： H04N5/53

    摘要： A monolithic integrated automatic gain control system for a TV receiver includes a differential gating stage having one reference input, a gating pulse input and a synchronizing signal pulse input. This gating stage is responsive to simultaneous application of gating and sync pulses to provide an output signal proportional to the signal level of the video sync pulse. This output signal is supplied to a differential IF-AGC amplifier stage which supplies an amplified IF-AGC output signal to the IF amplifier of a TV receiver to control the gain thereof. A differential RF-AGC amplifier and delay stage is coupled to the IF-AGC amplifier stage output and provides a delayed RF-AGC signal which is supplied to the RF-amplifier of the TV receiver to provide a delayed RF gain control signal thereto.