Chip-to-chip signal transmission system and chip-to-chip capacitive coupling transmission circuit

A chip-to-chip signal transmission system, comprising:

• a first chip, comprising:
• a transmission-metal-pad unit disposed on a surface of the first chip;
• a transmitter coupled to the transmission-metal-pad unit, receiving input data, and outputting a chip-to-chip coupling signal through the transmission-metal-pad unit;
• and
• a first testing unit comprising a transmission-testing-metal-pad unit and a receiving-testing circuit, and the transmission-testing-metal-pad unit being coupled to the transmission-metal-pad unit;
• a second chip disposed above the first chip and comprising:
• a receiving-metal-pad unit disposed on a surface of the second chip corresponding to the transmission-metal-pad unit;
• a receiver coupled to the receiving-metal-pad unit, receiving the chip-to-chip coupling signal through the receiving-metal-pad unit, and outputting an output signal;
• and
• a second testing unit comprising a receiving-testing-metal-pad unit and a driving-testing circuit, and the receiving-testing-metal-pad unit being coupled to the receiving-metal-pad unit;
• and
• a dielectric layer disposed between the first chip and the second chip,
• wherein, when the transmitter receives a driving-testing signal, the transmitter transmits a transmission-testing-coupling signal through the transmission-testing-metal-pad unit according to the driving-testing signal, the first testing unit receives the transmission-testing-coupling signal through the transmission-metal-pad unit, and the first testing unit outputs a transmission-testing signal according to the transmission-testing-coupling signal;
• and
• when the second testing unit receives the driving-testing signal, the second testing unit transmits a receiving-testing-coupling signal through the receiving-testing-metal-pad unit according to the driving-testing signal, the receiver receives the receiving-testing-coupling signal through the receiving-metal-pad unit, and the receiver outputs a receiving-testing signal according to the receiving-testing-coupling signal.