公开(公告)号：NO744473A

公开(公告)日：1975-08-25

申请号：NO744473

申请日：1974-12-11

Applicant: RCA CORP

Inventor： LIMBERG LEROY A ,  STECKLER S A

IPC: H04N5/04 ,  H04N5/06 ,  H04N5/08 ,  H04N5/12 ,  H04N5/213

CPC classification number: H04N5/12

公开(公告)号：SE7412701L

公开(公告)日：1975-04-21

申请号：SE7412701

申请日：1974-10-09

Applicant: RCA CORP

Inventor： STECKLER S A

IPC: H03F3/72 ,  H03K5/26 ,  H03L7/091 ,  H04N5/04 ,  H04N5/12

公开(公告)号：BE776063A

公开(公告)日：1972-03-16

申请号：BE776063

申请日：1971-11-30

Applicant: RCA CORP

Inventor： LIMBERG A L ,  STECKLER S A

IPC: H02H7/20 ,  H03K4/08 ,  H03K4/64 ,  H01H

Abstract: A protection circuit limits the collector current of a transistor employed as a clamp-to-ground stage in the event the collector terminal of the transistor is accidentally short circuited during conduction to a low-impedance voltage source. The protection circuit includes a transistor which has its base-emitter junction coupled across the base-emitter junction of the clamping transistor and has a collector resistor chosen to provide a saturation current for the protection transistor which holds the base-emitter junction voltage at a level which limits the collector current of the clamping transistor.