Patent ID: 7705656

Claim:
A leakage current measurement circuit comprising: a charge supply transferring charges supplied from a first power supply voltage or a second power supply voltage in response to an enable signal or to a reverse enable signal having a phase opposite to a phase of the enable signal; and a leakage current generator making the charges transferred from the charge supply flow to the first power supply voltage or the second power supply voltage, the first power supply voltage being higher than the second power supply voltage, wherein the leakage current generator includes: a substrate leakage current generating circuit located between the first power supply voltage and the charge supply or between the second power supply voltage and the charge supply to generate a substrate leakage current; and a gate leakage current generating circuit located between the first power supply voltage and the charge supply or between the second power supply voltage and the charge supply to generate a gate leakage current, wherein the charge supply receives charges from the first power supply voltage or the second power supply voltage in response to the enable signal or to the reverse enable signal, and preserves previously received charges when it cannot receive charges from the first power supply voltage or the second power supply voltage any more.