公开(公告)号：US3747005A

公开(公告)日：1973-07-17

申请号：US3747005D

申请日：1971-02-01

Applicant: MOTOROLA INC

Inventor： FREIMARK R ,  NILSSEN O

IPC: H03F3/183 ,  H03F3/04

CPC classification number: H03F3/183

Abstract: An audio power amplifier comprising a transistor operated as an emitter follower which is quiescently biased so that the DC current through the output speaker is small. A feedback circuit connected between the output and the control electrode of the transistor compares the magnitude of the output peak voltage with the magnitude of the bias potential on the control electrode. When the peak output voltage exceeds the magnitude of the bias potential the feedback circuit increases the control bias potential to raise the operating point of the transistor. Where the magnitude of the peak voltage of the output does not exceed the magnitude of the bias potential, there is no feedback and the bias potential is maintained to keep the transistor at its quiescent operating point.

Abstract translation: 一种音频功率放大器，包括作为射极跟随器工作的晶体管，该晶体管被静态偏置，使得通过输出扬声器的直流电流很小。 连接在晶体管的输出和控制电极之间的反馈电路将输出峰值电压的大小与控制电极上的偏置电位的大小进行比较。 当峰值输出电压超过偏置电位的大小时，反馈电路增加了控制偏置电位，以提高晶体管的工作点。 在输出的峰值电压的大小不超过偏置电位的幅度的情况下，不存在反馈，并且保持偏置电位以保持晶体管处于其静态工作点。

公开(公告)号：US3725583A

公开(公告)日：1973-04-03

申请号：US3725583D

申请日：1970-07-20

Applicant: MOTOROLA INC

Inventor： GUNDERSON P ,  FREIMARK R

IPC: H03F3/68 ,  H03G1/00 ,  H03G3/02 ,  H03G3/10 ,  H03G5/02

CPC classification number: H03G1/0082 ,  H03F3/68 ,  H03G1/0023 ,  H03G3/10

Abstract: A single volume control for a plurality of audio channels is formed by a pair of gain controllable differential amplifiers operated as small-signal amplifiers in an open-ended configuration. The current source for each differential amplifier is provided by a variable current source, such as a transistor collector. By altering the DC bias on this variable current source transistor, the bias current and therefore the gain of the differential amplifier is correspondingly varied. A single potentiometer provides the DC voltage control for the variable current source transistors which, in turn, function as a volume control for the circuit.

Abstract translation: 用于多个音频通道的单个音量控制由作为开放端配置的小信号放大器操作的一对增益可控差分放大器形成。 每个差分放大器的电流源由诸如晶体管集电极的可变电流源提供。 通过改变该可变电流源晶体管上的DC偏置，偏置电流以及因此差分放大器的增益相应地变化。 单个电位器为可变电流源晶体管提供直流电压控制，这又作为电路的音量控制。

公开(公告)号：US3769459A

公开(公告)日：1973-10-30

申请号：US3769459D

申请日：1970-07-20

Applicant: MOTOROLA INC

Inventor： NIFFENEGGER P ,  FREIMARK R

IPC: H03F3/68 ,  H03G1/00 ,  H03G3/02 ,  H03G3/10 ,  H03G5/02 ,  H03J5/04

CPC classification number: H03G1/0082 ,  H03F3/68 ,  H03G1/0023 ,  H03G3/10

Abstract: A single volume control for a plurality of audio channels is formed by a pair of gain controllable differential amplifiers operated as small-signal amplifiers in an open-ended configuration. The current source to each differential amplifier forms the signal path between the input and output of the volume control circuit. The transistor forming the current path, and signal path, is a class A amplifier. By altering the DC bias on one of the current control devices in each of the differential amplifiers, the amount of signal coupled to the output thereof is correspondingly varied. A single potentiometer provides a DC voltage control for the variable impedance to the selected transistor of each of the differential amplifiers which, in turn, functions as a volume control for all channels.

Abstract translation: 用于多个音频通道的单个音量控制由作为开放端配置的小信号放大器操作的一对增益可控差分放大器形成。 每个差分放大器的电流源形成了音量控制电路的输入和输出之间的信号路径。 形成电流路径的晶体管和信号路径是A类放大器。 通过改变每个差分放大器中的一个电流控制装置上的DC偏置，耦合到其输出的信号量相应地变化。 单个电位器为每个差分放大器的选定晶体管提供可变阻抗的直流电压控制，而这些差分放大器又作为所有通道的音量控制。

公开(公告)号：BR8108440A

公开(公告)日：1982-03-09

申请号：BR8108440

申请日：1981-03-16

Applicant: MOTOROLA INC

Inventor： FREIMARK R ,  SHAW M

IPC: G01L9/00 ,  G01D3/036 ,  G01L9/06 ,  G01L19/04 ,  G08C19/00 ,  G08C25/00 ,  H03F1/30 ,  H03F3/04

Abstract: An amplifier circuit is disclosed for temperature compensating the output voltage thereof with respect to undesirable temperature induced signals from a silicon pressure transducer and/or from components of the amplifier itself. The amplifier includes a first operational amplifier and a second operational amplifier. A first circuit connects the output terminal of the first operational amplifier through a summing node to one input terminal of the second amplifier. Output signals from the pressure transducer are applied between one input terminal of the first operational amplifier and another input terminal of the second amplifier. A temperature compensating circuit is connected to the summing node for enabling the output voltage of the amplifier to be substantially independent of temperature. An initial offset voltage compensating circuit is coupled to the summing node for adjusting the intercept of the pressure-to-output voltage transfer curve. The gain of the second operational amplifier determines the slope of the curve.

公开(公告)号：BR7200464D0

公开(公告)日：1973-05-10

申请号：BR46472

申请日：1972-01-28

Applicant: MOTOROLA INC

Inventor： FREIMARK R ,  NILSSEN O

IPC: H03F3/183 ,  H03F3/04

Abstract: An audio power amplifier comprising a transistor operated as an emitter follower which is quiescently biased so that the DC current through the output speaker is small. A feedback circuit connected between the output and the control electrode of the transistor compares the magnitude of the output peak voltage with the magnitude of the bias potential on the control electrode. When the peak output voltage exceeds the magnitude of the bias potential the feedback circuit increases the control bias potential to raise the operating point of the transistor. Where the magnitude of the peak voltage of the output does not exceed the magnitude of the bias potential, there is no feedback and the bias potential is maintained to keep the transistor at its quiescent operating point.

公开(公告)号：WO1981003094A1

公开(公告)日：1981-10-29

申请号：PCT/US1981000375

申请日：1981-03-16

Applicant: MOTOROLA INC

Inventor： MOTOROLA INC ,  SHAW M ,  FREIMARK R

IPC: H03F03/04

CPC classification number: G01L9/045 ,  G01D3/036 ,  H03F1/302

Abstract: Amplifier circuit for temperature compensating the output voltage thereof with respect to undesirable temperature induced signals from a silicon pressure transducer (10) and/or from components of the amplifier itself. The amplifier includes a first operational amplifier (50) and a second operational amplifier (68). A first circuit connects the output terminal of the first operational amplifier through a summing node (66) to one input terminal (70) of the second amplifier. Output signals from the pressure transducer are applied between one input terminal (52) of the first operational amplifier and another input terminal (72) of the second amplifier. A temperature compensating circuit (116) is connected to the summing node for enabling the output voltage of the amplifier to be substantially independent of temperature. An initial offset voltage compensating circuit (80) is coupled to the summing node for adjusting the intercept of the pressure-to-output voltage transfer curve. The gain of the second operational amplifier determines the slope of the curve.

Abstract translation: 用于相对于来自硅压力传感器（10）和/或放大器本身的组件的不期望的温度感应信号来温度补偿其输出电压的放大器电路。 放大器包括第一运算放大器（50）和第二运算放大器（68）。 第一电路将第一运算放大器的输出端通过求和节点（66）连接到第二放大器的一个输入端（70）。 来自压力传感器的输出信号被施加在第一运算放大器的一个输入端（52）和第二放大器的另一个输入端（72）之间。 温度补偿电路（116）连接到求和节点，用于使放大器的输出电压基本上与温度无关。 初始偏移电压补偿电路（80）耦合到求和节点，用于调整压力 - 输出电压传递曲线的截距。 第二运算放大器的增益决定曲线的斜率。