Computer-readable medium and the method and apparatus for performing scan test on a chip

In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus is used for performing a scan test on a chip. In certain configurations, the apparatus includes an internal voltage source on a same die of the chip. The internal voltage source receives a constant voltage. The internal voltage source generates an internal voltage based on the constant voltage. The internal voltage is maintained at a lower voltage level in a capture phase of the scan test, and is increased from the lower voltage level to a high voltage level at a start of a shift phase of the scan test and reduced from the high voltage level to the lower voltage level at an end of the shift phase.