High voltage protection for an output circuit

Details High voltage protection for an output circuit High voltage protection for an output circuit

H - Electricity

03

K

350/109, 328/198

H03K 17/08 (2006.01) H04N 5/63 (2006.01) H04N 9/64 (2006.01)

Patent

CA 1180065

RCA 78,822 ABSTRACT A protection circuit (44,45) is coupled between a low voltage signal processing semiconductor device (40) subject to damage by high voltage transients, and a signal output terminal (21) at which high voltage transients can appear. The protection circuit comprises a first transistor (44) arranged as an emitter follower for normally conducting signals from the semiconductor device (40) to the output terminal (21), and a second transistor (45) of opposite conductivity type. The base and emitter electrodes of the first transistor (44) are directly connected to the base and emitter electrodes of the second transistor (45), respectively, such that the second transistor (45) is normally non-conductive. Transient currents associated with negative high voltage transients at the output terminal (21) are diverted to a point of operating potential (+Vcc) via the first transistor (44). The second transistor (45) is rendered conductive in response to positive high voltage transients at -the output terminal (21) for diverting associated transient currents to a point of second operating potential (ground).

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