| 摘要 |
A pad circuit and operating method for automatically adjusting gains is disclosed, wherein the pad circuit is embedded in an integrated circuit chip that further includes a core logic circuit therein. The pad circuit includes an input/output pin, a gain-adjustable output buffer, an input buffer and a signal feature detector. The method includes the steps as follows. A test signal is firstly issued from the core logic circuit to the gain-adjustable output buffer, while the test signal is then manipulated and outputted to an external device via the input/output pin. Next, a feedback test signal is fed into the input buffer from the external device, while a test result is realized according to a waveform feature of the feedback test signal. Finally, the gain of the gain-adjustable output buffer is adjusted according to the obtained test result.
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