公开(公告)号：US3701031A

公开(公告)日：1972-10-24

申请号：US3701031D

申请日：1970-08-26

Applicant: MOTOROLA INC

Inventor： FREDERIKSEN THOMAS M ,  LONG ERNEST L

IPC: H03F3/30 ,  H03F3/18

CPC classification number: H03F3/3077

Abstract: An integrated power amplifier circuit providing high current gain and substantially unity voltage gain for operating as a current boost amplifier includes temperature stabilized current sources operated from a stabilized voltage supply to cause the operation of the amplifier to be independent of supply voltage and temperature variations. In addition, protection against reverse current flow and output current limiting of the output stage is provided.

Abstract translation: 提供高电流增益和用于作为电流升压放大器工作的基本上单位电压增益的集成功率放大器电路包括从稳定电压源操作的温度稳定的电流源，以使放大器的操作与电源电压和温度变化无关。 另外，还提供了对输出级的反向电流和输出电流限制的保护。

公开(公告)号：US3864642A

公开(公告)日：1975-02-04

申请号：US35104773

申请日：1973-04-13

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：US3693107A

公开(公告)日：1972-09-19

申请号：US3693107D

申请日：1970-11-02

Applicant: MOTOROLA INC

Inventor： LONG ERNEST L

IPC: H03F3/18 ,  H03F3/20 ,  H03F3/213 ,  H03F3/30 ,  H03F3/347

CPC classification number: H03F3/347 ,  H03F3/213 ,  H03F3/3083

Abstract: An integrated circuit power amplifier utilizes a quasicomplementary power output stage incorporating an NPN Darlington amplifier for one section and a field-aided lateral PNP transistor cascaded to an NPN Darlington amplifier for the other section. Feedback from the amplifier output terminal to an intermediate stage coupled to the input of the power output stage is separated into DC and AC feedback paths. The biasing of the power output stage includes an epitaxial resistance matched to the field-aided transistor bulk resistance to cancel the effect of the bulk resistance for improved output stage thermal stability.

公开(公告)号：CA917315A

公开(公告)日：1972-12-19

申请号：CA917315D

Applicant: MOTOROLA INC

Inventor： FREDERIKSEN THOMAS M ,  LONG ERNEST L