| 摘要 |
The invention discloses an active back-end termination circuit, which comprises a first resistor, a first transistor, a second resistor, and a second transistor. The first resistor and the first transistor are connected in series for forming a first impendence unit. A first source of the first transistor is connected to a working voltage with VTT. The second resistor and the second transistor are connected in series for forming a second impendence unit. A second gate and a second drain of the second transistor are connected to the working voltage with VTT. Wherein, the first impendence unit and the second impendence unit are connected in parallel. The first transistor or the second transistor is switched on through a power source, and the first transistor and the second transistor change the impedance actively for matching a load according to the voltage source.
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