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    Automatic gain control rf-if amplifier
    1.
    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

    Applicant: MOTOROLA INC

    Inventor： SOLOMON JAMES E ,  DAVIS WALTER RICHARD

    IPC: H03G1/00

    CPC classification number: H03G1/0023

    Abstract: 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.

    Hall effect switching device
    3.
    发明授权
    Hall effect switching device 失效
    霍尔效应开关装置

    公开(公告)号：US3671767A

    公开(公告)日：1972-06-20

    申请号：US3671767D

    申请日：1971-01-15

    Applicant: MOTOROLA INC

    Inventor： DAVIS WALTER RICHARD

    IPC: H03K3/2897 ,  H03K17/90 ,  H01R5/00

    CPC classification number: H03K17/90 ,  H03K3/2897 ,  Y10T307/766

    Abstract: There is disclosed a Hall effect switching device involving the combination of a Hall effect device, a differential amplifier and a current control trigger circuit. The use of the differential amplifier in conjunction with the current control-trigger circuit amplifies the Hall effect voltage and permits the use of high hysteresis triggers. Control of the current control-trigger circuit is accomplished by a pair of current sources, the output of one of which is varied in response to the output of the differential amplifier. The trigger circuit is initially unbalanced in its OFF mode and is turned ON by the output of the amplifier reaching a predetermined high value. The trigger is turned OFF by the output of the differential amplifier returning to some specified low value.

    Abstract translation: 公开了包括霍尔效应器件，差分放大器和电流控制触发电路的组合的霍尔效应开关器件。 使用差分放大器与电流控制触发电路结合放大霍尔效应电压并允许使用高滞后触发。 电流控制触发电路的控制由一对电流源实现，其中一个电流源的输出响应于差分放大器的输出而变化。 触发电路最初在其OFF模式下不平衡，并且由放大器的输出达到预定的高值而导通。 通过差分放大器的输出返回到某个指定的低值，触发器被关闭。

    Temperature stable monolithic multiplier circuit
    4.
    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

    Applicant: MOTOROLA INC

    Inventor： DAVIS WALTER RICHARD ,  SOLOMON JAMES E

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

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

    Abstract: 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.

    Abstract translation: 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。

    5.
    发明专利
    未知

    公开(公告)号：DE2349462A1

    公开(公告)日：1974-04-11

    申请号：DE2349462

    申请日：1973-10-02

    Applicant: MOTOROLA INC

    Inventor： CECIL JAMES BARTON ,  DAVIS WALTER RICHARD

    IPC: G05F1/56 ,  G05F3/22

    Abstract: Circuitry for providing a constant current to a load includes a source of current and a regulating circuit interposed between the current source and the load. The regulating circuit includes a current shunting transistor coupled to the output of the current source and a feedback transistor also coupled to the output of the current source and to the base of the current shunting transistor. A diode connected between the current shunting transistor and the current source is chosen to have a dynamic admittance substantially equal to the transconductance of the current shunting transistor to provide the latter with unity voltage gain. A variation in current output of the source is accommodated by the current shunting transistor so that a substantially constant voltage at the output thereof is maintained. An output circuit including a transistor, coupled to the output of the current shunting transistor and to the load, and controlled by the output voltage, provides a substantially constant current to the load despite current variations from the current source.

    AUTOMATIC GAIN CONTROL RF-IF AMPLIFIER
    8.
    发明专利
    AUTOMATIC GAIN CONTROL RF-IF AMPLIFIER 未知

    公开(公告)号：GB1207276A

    公开(公告)日：1970-09-30

    申请号：GB5674368

    申请日：1968-11-29

    Applicant: MOTOROLA INC

    Inventor： SOLOMON JAMES E ,  DAVIS WALTER RICHARD

    IPC: H03G1/00

    Abstract: 1,207,276. Transistor automatic gain control circuits. MOTOROLA Inc. 29 Nov. 1968 [29 Jan., 1968], No. 56743/68. Headings H3T and H4R. A gain control circuit comprises a first pair of transistors 40, 42, Fig. 2, with the collectoremitter path of a further transistor 48 as common emitter load, together with a second pair of transistors 44, 46 with the collector-emitter path of transistor 50 as common emitter load. Signals to be amplified are applied in push-pull to the bases of transistors 48, 50 the emitter circuits of which comprise a T-network of resistors 56, 58, 60: a push pull output is derived from the collectors of transistors 40, 46. Gain control signals are applied via terminals 52 between the bases of transistors 42, 44 and 40, 46 the arrangement being such that decoupling capacitors for the signal frequency are not necessary. In a modification transistors 48, 50, Fig. 4, are driven by means of a transformer 49 with equal series-connected secondary circuit resistors 51, 53, the emitter circuit being replaced by a # network of resistors 70, 72, 74. A temperature - compensated power supply is derived from a potentiometer network comprising resistors 71, 73, 114, 116 and transistors 85, 87 strapped as diodes: the collector supply for transistors 40, 46 is taken off via transistors 75, 76 and their base supply via a further transistor 77. Base bias for transistors 48, 50 is derived over transistor 179. Transistors 40, 46 drive an output stage comprising transistors 86, 88 and a pair of emitter-followers 82, 84: transistors 82, 84, 86, 88 are provided with a common emitter impedance comprising transistors 90,92 in Darlington connection. The transistors 90, 92 are biased from a potentiometer network comprising resistors 89, 91 and transistors 85, 87 strapped as diodes.

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