Source follower
AssigneeMediatek Inc.
InventorChe-Hsun Kuo
Life of this patent
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Abstract
A source follower with an input node and an output node includes a first transistor, a second transistor, and a DC (Direct Current) tracking circuit. The first transistor has a control terminal, a first terminal coupled to a first node, and a second terminal coupled to a second node. The second transistor has a control terminal, a first terminal coupled to a ground voltage, and a second terminal coupled to the first node. The DC tracking circuit sets the second DC voltage at the second node to a specific level. The specific level is determined according to the first DC voltage at the first node. The output node of the source follower is coupled to the first node.
Claims20
A source follower, comprising:
- a first transistor, comprising a control terminal, a first terminal coupled to an output node of the source follower, and a second terminal coupled to a DC (Direct Current) tracking circuit;
- and
- a second transistor, comprising a control terminal, a first terminal coupled to ground, and a second terminal coupled to the output node;
- wherein the DC tracking circuit is arranged for comparing a first voltage of the output node with a voltage to generate a control signal to a control terminal of a fourth transistor to provide a second voltage to the second terminal of the first transistor.
A source follower with an input node and an output node, comprising:
- a first transistor, wherein the first transistor has a control terminal, a first terminal coupled to a first node, and a second terminal coupled to a supply voltage;
- a second transistor, wherein the second transistor has a control terminal, a first terminal coupled to a second node, and a second terminal coupled to the first node;
- and
- a DC (Direct Current) tracking circuit, comparing a first voltage of the output node with a voltage to general a control signal to a control terminal of a fourth transistor to provide a second DC voltage at the second node to a specific level;
- wherein the output node of the source follower is coupled to the first node.
Dependencies are inferred from the claim text.