Patent ID: 8148996

Claim:
A circuit testing apparatus for testing a device under testing, comprising: a logic tester coupled to the device under testing for providing a testing signal and a trigger signal and determining a testing result for the device under testing according to a digital measuring result; and a signal-measuring module coupled to the device under testing and the logic tester for measuring a DC signal generated by the device under testing according to the testing signal after receiving the trigger signal, and generating the digital measuring result; wherein the testing signal is sent directly to the device under testing from the logic tester without passing through the signal-measuring module, and the trigger signal is directly sent to the signal-measuring module from the logic tester; and wherein the signal-measuring module comprises: an analog-to-digital converter for receiving the trigger signal and generating the digital measuring result according to the DC signal; a memory device coupled to the analog-to-digital converter for storing the digital measuring result; a counter, in which coupled to the logic tester and the memory device for counting after the trigger signal is received by the counter and allocating the location of the memory device where the digital measuring result is stored; and a modulator, in which coupled to the device under testing and the analog-to-digital converter for attenuating the DC signal to a range of voltage levels recognized by the analog-to-digital converter.