Patent ID: 7504708

Claim:
A high-frequency switching device comprising: a connecting region having a first conductivity type; a first barrier region bordering on the connecting region, the first barrier region having a second conductivity type which differs from the first conductivity type; a semiconductor region bordering on the first barrier region, the semiconductor region having a dopant concentration which is lower than a dopant concentration of the first barrier region or equal to 0; a second barrier region bordering on the semiconductor region, the second barrier region having the first conductivity type; a base region bordering on the second barrier region, the base region having the second conductivity type; a third barrier region bordering on the semiconductor region, the third barrier region having the second conductivity type and a higher dopant concentration than the semiconductor region; an emitter region bordering on the third barrier region, the emitter region having the first conductivity type; a fourth barrier region bordering on the semiconductor region, the fourth barrier region having the second conductivity type and a higher dopant concentration than the semiconductor region; and a collector region bordering on the fourth barrier region, the collector region having the first conductivity type.