公开(公告)号：US3579042A

公开(公告)日：1971-05-18

申请号：US3579042D

申请日：1968-12-23

Applicant: LEAR SIEGLER INC

Inventor： ABEND IRVING J

IPC: H02H3/38 ,  H02H7/20 ,  H03F1/52 ,  H02H7/00

CPC classification number: H02H3/38 ,  H02H7/205 ,  H03F1/52

Abstract: Dynamic short circuit and overload protection circuit for transistorized power amplifiers; the circuit is noninstantaneous in operation and comprises means for sensing current through and voltage across a transistor to be protected, means for combining, and integrating with respect to time, signals related to the sensed voltage and current to provide a control signal, and means for shunting the input to the transistor when the control signal reaches a predetermined value.

公开(公告)号：US3566290A

公开(公告)日：1971-02-23

申请号：US3566290D

申请日：1968-12-23

Applicant: LEAR SIEGLER INC

Inventor： ABEND IRVING J

IPC: H03F1/56 ,  H03F3/68 ,  H03F1/34

CPC classification number: H03F1/56 ,  H03F3/68

Abstract: AN AMPLIFIER CIRCUIT, FOR ACCEPTING EITHER HIGH OR LOW IMPEDANCE SOURCES, HAVING TWO TRANSISTOR STAGES, THE TRANSISTOR IN THE FIRST STAGE OPERATINH IN A HIGH IMCONFIGURATION WHEN ACCEPTING A SIGNAL FROM A HIGHIMPEDANCE SOURCE AND IN A COMMON-BASE CONFIGURATION WHEN ACCEPTING A SIGNAL FROM A LOW IMPEDANCE SOURCE. THE TRANSISTOR IN THE SECOND STAGE OPERATES IN A COMMONEMITTER CONFIGURATION. FEEDBACK IS PROVIDED TO SET THE GAIN OF THE AMPLIFIER CIRCUIT AND, WHEN USED WITH LOW IM-

PEDANCE SOURCES, THE FEEDBACK FURTHER ADJUSTS THE GAIN OF THE AMPLIFIER CIRCUIT TO MAINTAIN THE OVERALL GAIN ESSENTIALLY AT THE SAME VALUE FOR ALL LEVELS OF LOW INPUT SOURCE IMPEDANCE.

公开(公告)号：US3484697A

公开(公告)日：1969-12-16

申请号：US3484697D

申请日：1965-08-27

Applicant: LEAR SIEGLER INC

Inventor： ABEND IRVING J

IPC: H01Q1/27 ,  H01Q23/00 ,  H03B1/00 ,  H03B5/12 ,  H03D11/04 ,  H03F3/191 ,  H01Q19/00 ,  H04B1/22

CPC classification number: H03D11/04 ,  H01Q1/273 ,  H01Q23/00 ,  H03B5/1203 ,  H03B5/1231 ,  H03B2201/012 ,  H03D2200/0096 ,  H03F3/191