Tester for semiconductor integrated circuits and method for testing semiconductor integrated circuits

A tester for semiconductor integrated circuits, comprising:

• a testing circuit board configured to transmit signals to and receive signals from a semiconductor integrated circuit to be tested, said semiconductor integrated circuit comprising an A/D converter circuit to convert analog signals to digital signals and a D/A converter circuit to convert digital signals to analog signals;
• a test assisting device disposed in the vicinity of and connected to the testing circuit board;
• and
• a test machine connected to said test assisting device,
• wherein said test assisting device comprises:
• a data circuit to generate digital test signals and to supply the digital test signals to the D/A converter circuit of said semiconductor integrated circuit to be tested;
• a testing D/A converter circuit to convert the digital test signals from the data circuit to analog test signals and to supply the analog test signals to the A/D converter circuit of said semiconductor integrated circuit to be tested;
• a testing A/D converter circuit to convert analog test outputs from the D/A converter circuit of said semiconductor integrated circuit to be tested to digital test outputs;
• a measured data memory to store the digital test outputs from the A/D converter circuit of said semiconductor integrated circuit to be tested and the digital test outputs of said testing A/D converter circuit;
• and
• an analyzer portion to analyze each of said digital test outputs stored in said measured data memory, and
• said tester for semiconductor integrated circuits is configured to supply, based on instructions from said test machine, said digital test signals and said analog test signals to said semiconductor integrated circuit to be tested, and to supply results of analysis of each digital test output stored in said measured data memory by said analyzer portion to said test machine.