| 摘要 |
<p>The circuit receives several supply voltages (V1,V2,V3) via connections (L1,L2,L3) each of which is connected to respective switches (T1,T2,T3). At least one of the switches (T1) is a first MOS transistor of P conductivity type connected between the line (L1) and a common output terminal (S). The circuit also includes: - a second transistor (T3) of P conductivity type, connected between the grid of the first transistor (T1) and a node (N) maintained at the highest of the supply voltages; - a third transistor (T4), of N conductivity type, of less conductivity in the conducting state as the first transistor (T1), connected between the grid of the first transistor (T1) and a reference potential, and; - a fourth transistor (T5), of P type of conductivity, whose source is connected to a supply line associated with a switch, and whose drain is connected to a current source (R1) and to the grids of the second (T3), third (T4) and fourth (T5) transistors..</p> |
