Voltage detection circuit and internal voltage generator using the same

An operation method of a voltage detection circuit, comprising:

• receiving an external reference voltage through a pad to generate a test reference voltage by using the received external reference voltage, during a test operation;
• detecting a voltage level of a target internal voltage based on a voltage level of the test reference voltage during the test operation;
• forming a mirror current using a current mirror structure to generate a normal reference voltage by using the mirror current, during a normal operation;
• and
• detecting the voltage level of the target internal voltage based on a voltage level of the normal reference voltage during the normal operation.

An internal voltage generator, comprising:

• a voltage detection unit suitable for comparing a voltage level of an internal voltage terminal with a voltage level of a reference voltage terminal and generating a detection signal based on a comparison result;
• a test reference voltage generating unit suitable for receiving an external reference voltage through a pad during a test operation and for supplying the received external reference voltage to the reference voltage terminal as the reference voltage by using a first input resistance, during a test operation;
• a normal reference voltage generating t having a current mirror structure, wherein the normal reference voltage generating unit is suitable for generating an internal reference voltage and for supplying the internal reference voltage to the reference voltage terminal as the reference voltage by using a second input resistance different from the first input resistance, during a normal operation;
• an oscillation unit suitable for generating an oscillation signal in response to the detection signal;
• and
• a pumping unit suitable for generating a negative voltage by using a charge pumping operation based on the oscillation signal and for supplying the negative voltage to the internal voltage terminal.