| 摘要 |
<p>A composite transistor comprising a cascade arrangement of a bipolar transistor (Q1) and field effect transistor (Q2) serves to control supply of a load current (Ic). In order to ameliorate problems due to stray inductance a third transistor (Q3) provides a shunt path for the base current (IB1) and accumulated base carrier charge from the base (B1) of the bipolar transistor (Q1) to source (S) of the field effect transistor (Q), the third transistor (Q3) being switched ON in response to signal eG when the latter causes field effect transistor the (Q2) to be switched OFF. The third transistor (Q3) may be controlled via a fourth transistor in response to the signal eG. </p> |
