公开(公告)号：US3648154A

公开(公告)日：1972-03-07

申请号：US3648154D

申请日：1970-12-10

Applicant: MOTOROLA INC

Inventor： FREDERIKSEN THOMAS M ,  RUSSELL RONALD W

IPC: G05F3/22 ,  G06G7/14 ,  H03F1/30 ,  H03F3/30 ,  H03F3/347 ,  H03K3/023 ,  H03K9/06 ,  H03K19/09 ,  G05F1/48

CPC classification number: H03K19/09 ,  G05F3/22 ,  G05F3/227 ,  G06G7/14 ,  H03F1/302 ,  H03F1/307 ,  H03F3/3083 ,  H03F3/347 ,  H03K3/023 ,  H03K9/06

Abstract: An operational amplifier capable of operating over a relatively wide variation of power supply voltages and temperature employs a high-beta lateral PNP buffer stage single input or dual input versions. Reference biasing voltage for operating the amplifier circuit is obtained from a current source supplying current through a string of series connected diodes, and a differential amplifier start circuit is provided in order to assure that current commences flowing through the diode string since the current source driving the string is biased from the same diode string.

Abstract translation: 能够在相对宽的电源电压和温度变化下运行的运算放大器采用高β横向PNP缓冲级单输入或双输入版本。 用于操作放大器电路的参考偏置电压是从通过一串串联二极管提供电流的电流源获得的，并且提供差分放大器启动电路，以便确保电流开始流过二极管串，因为电流源驱动 串相同的二极管串偏置。

公开(公告)号：US3864642A

公开(公告)日：1975-02-04

申请号：US35104773

申请日：1973-04-13

Applicant: MOTOROLA INC

Inventor： LONG ERNEST L ,  RUSSELL RONALD W ,  SOLOMON JAMES E

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

CPC classification number: H03F3/3071 ,  H03F1/52

Abstract: 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.

Abstract translation: 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。

公开(公告)号：CA941912A

公开(公告)日：1974-02-12

申请号：CA128349

申请日：1971-11-23

Applicant: MOTOROLA INC

Inventor： FREDERIKSEN THOMAS M ,  RUSSELL RONALD W

IPC: G05F3/22 ,  G06G7/14 ,  H03F1/30 ,  H03F3/30 ,  H03F3/347 ,  H03K3/023 ,  H03K9/06 ,  H03K19/09

Abstract: A current mode operational amplifier is shown which is powered by a single voltage supply and operates in response to input signals represented by current values. The input system for the operational amplifier employs an inverting input circuit responsive to a first input signal and a non-inverting input circuit responsive to a second input signal. A current mirror circuit is employed for subtracting one input signal from the second input signal and the difference signal is applied to the operational amplifier.