A leakage detection circuit

Abstract

The invention discloses a leakage detection circuit, which comprises a first current mirror, a second current mirror, a first transistor, a first switch and a first reference current source; the first current mirror is connected with the second current mirror, and is used to The two current mirrors provide the reference current; the first pole of the first transistor is connected to the first power supply, the second pole of the first transistor is connected to the current output end of the second current mirror, and the gate of the first transistor is connected to the first through the first switch. The bias voltage end of the current mirror is connected; the gate of the first transistor is used to be connected with the element to be tested; the first end of the first reference current source is connected with the current output end of the second current mirror, and the first end of the first reference current source The two terminals are connected with the second power supply. The embodiment of the present invention realizes the detection of the leakage current of the voltage stabilizing capacitor.

Description

technical field [0001] Embodiments of the present invention relate to current detection technology, and in particular to a leakage detection circuit. Background technique [0002] In the circuit system, the gate of the transistor usually needs to be connected with a voltage stabilizing capacitor to stabilize the gate voltage of the transistor and ensure the normal operation of the circuit. [0003] figure 1 It is the circuit block diagram of the voltage stabilizing capacitor circuit. When the circuit works normally, the voltage stabilizing capacitor C is charged to stabilize the voltage of the gate of the transistor M at Vg, and the charge stored in the stabilizing capacitor C is Q=C*Vg. However, if the voltage stabilizing capacitor C leaks, the voltage stabilizing capacitor C stores As the charge decreases, the voltage of the gate of the transistor M decreases, and the circuit cannot work stably. Therefore, it is necessary to detect the leakage current of the voltage sta...

AI Technical Summary

Problems solved by technology

When the circuit works normally, the voltage stabilizing capacitor C is charged to stabilize the voltage of the gate of the transistor M at Vg, and the charge stored in the stabilizing capacitor C is Q=C*Vg. However, if the voltage stabilizing capacitor C leaks, the voltage stabilizing capacitor C stores The charge of the transistor M decreases, the voltage of the gate of the transistor M decreases, and the circuit cannot work stably

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