DYNAMIC OUTPUT BUFFER CIRCUIT

摘要

A dynamic output buffer circuit is provided to perform an automatic impedance matching and a pre-emphasis by a circuit installed inside a chip when appropriately selecting a test circuit. A dynamic output buffer circuit includes a controlling circuit(410) and an output circuit(420). The controlling circuit(410) includes a pre-emphasis circuit, an impedance matching circuit, and a register circuit. The controlling circuit(410) matches the characteristic impedance of a metal line with the output impedance of a dynamic output circuit. The output circuit(420) includes a dynamic ODT(430) and an input stage(440). The output circuit(420) outputs at least one output signal(D/O) controlling the output impedance and performing pre-emphasis to at least one input signal(D/I).