Leakage-current start-up reference circuit

摘要

A leakage-current start-up reference circuit is provided which includes a reference circuit unit, a trigger unit, a leakage-current generator and a disable control unit. The trigger unit includes a first transistor. The drain terminal of the trigger unit is connected to a start-up terminal of the reference circuit unit. The leakage-current generator includes a second transistor which is a gate-drain-tied transistor. The disable control unit includes a third transistor. The gate terminal of the disable control unit is connected to a control terminal of the reference circuit unit. The drain terminal of the leakage-current generator, the gate terminal of the trigger unit and the drain terminal of the disable control unit are joined at a node. The reference circuit unit is started up by the trigger unit to generate a reference current. A leakage-current start-up reference circuit having a current mirror is also provided.

主权项

1. A leakage-current start-up reference circuit comprising:
a reference circuit unit having a start-up terminal and a control terminal and generating a reference current; a trigger unit comprising a first transistor with source, gate and drain terminals, the drain terminal of the trigger unit being connected to the start-up terminal of the reference circuit unit, wherein the trigger unit starts up the reference circuit unit through the start-up terminal; a leakage-current generator comprising a second transistor with a drain terminal, the second transistor being a gate-drain-tied transistor; and a disable control unit comprising a third transistor with source, gate and drain terminals, the drain terminal of the leakage-current generator, the gate terminal of the trigger unit and the drain terminal of the disable control unit being joined at a node, and the gate terminal of the disable control unit being connected to the control terminal of the reference circuit unit, wherein the leakage-current generator provides a leakage-current for the disable control unit.