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US 6,646,482 B2Granted
Variable drive current driver circuit
AssigneeNEC Electronics Corporation
InventorJunichi Takeuchi
Life of this patent
Estimating the term…
Abstract
Disclosed is a variable drive current driver circuit, comprising: a pair of push-pull circuits for driving a load circuit complementarily; a first current source circuit for having a bias current flow into the pair of push-pull circuits; a second current source circuit for having the bias current flow out of the pair of push-pull circuits; and a control circuit for varying both the bias current flowed by the first current source circuit and the bias current flowed by the second current source circuit according to a control signal.
Claims11
A variable drive current driver circuit, comprising:
- a pair of push-pull circuits for driving a load circuit complementarily;
- a first current source circuit having a bias current flow into said pair of push-pull circuits;
- a second current source circuit having said bias current flow out of said pair of push-pull circuits;
- and
- a control circuit for varying both said bias current flowed by said first current source circuit and said bias current flowed by said second current source circuit according to a control signal;
- wherein said first current source circuit comprises a current mirror circuit, and said control circuit controls an input current of said current mirror circuit according to said control signal.
3 more elements
A variable drive current driver circuit, comprising:
- a pair of push-pull circuits for driving a load circuit complementarily;
- a first current source circuit having a bias current flow into said pair of push-pull circuits;
- a second current source circuit having said bias current flow out of said pair of push-pull circuits;
- and
- a control circuit for varying both said bias current flowed by said first current source circuit and said bias current flowed by said second current source circuit according to a control signal;
- wherein said first current source circuit comprises a current mirror circuit, and said control circuit controls an input current of said current mirror circuit according to said control signal;
- and
- said control circuit controls said input current by controlling a control terminal voltage of a transistor for flowing said input current.
5 more elements
A variable drive current driver circuit, comprising:
- a pair of push-pull circuits for driving a load circuit complementarily;
- a first current source circuit having a bias current flow into said pair of push-pull circuits;
- a second current source circuit having said bias current flow out of said pair of push-pull circuits;
- and
- a control circuit for varying both said bias current flowed by said first current source circuit and said bias current flowed by said second current source circuit according to a control signal;
- wherein said second current source circuit comprises a transistor, and said control circuit controls a control terminal voltage of said transistor according to said control signal;
- and
- a constant current source feeds into the transistor, and the transistor controls the only line in the second current source, wherein there is no means for current to drain in said pair of push-pull circuits other than through said transistor.
5 more elements
A variable drive current driver circuit, comprising:
- a pair of push-pull circuits for driving a load circuit complementarily;
- a first current source circuit having a bias current flow into said pair of push-pull circuits;
- a second current source circuit having said bias current flow out of said pair of push-pull circuits;
- and
- a control circuit for varying both said bias current flowed by said first current source circuit and said bias current flowed by said second current source circuit according to a control signal;
- and
- wherein each push-pull circuit receives a single input signal.
4 more elements
A variable drive current driver circuit, comprising:
- a pair of push-pull circuits for driving a load circuit complementarily;
- a first current source circuit having a bias current flow into said pair of push-pull circuits;
- a second current source circuit having said bias current flow out of said pair of push-pull circuits;
- and
- a control circuit for varying both said bias current flowed by said first current source circuit and said bias current flowed by said second current source circuit according to a control signal;
- wherein said second current source circuit comprises a transistor, and said control circuit controls a control terminal voltage of said transistor according to said control signal;
- and
- wherein each push-pull circuit receives a single input signal.
5 more elements
A variable drive current driver circuit, comprising:
- a pair of push-pull circuits for driving a load circuit complementarily;
- a first current source circuit having a bias current flow into said pair of push-pull circuits;
- a second current source circuit having said bias current flow out of said pair of push-pull circuits;
- and
- a control circuit for varying both said bias current flowed by said first current source circuit and said bias current flowed by said second current source circuit according to a control signal,
- wherein each push-pull circuit comprises at least two gate types.
3 more elements
A variable drive current driver circuit, comprising:
- a pair of push-pull circuits for driving a load circuit complementarily;
- a first current source circuit having a bias current flow into said pair of push-pull circuits;
- a second current source circuit having said bias current flow out of said pair of push-pull circuits;
- and
- a control circuit for varying both said bias current flowed by said first current source circuit and said bias current flowed by said second current source circuit according to a control signal;
- wherein said second current source circuit comprises a transistor, and said control circuit controls a control terminal voltage of said transistor according to said control signal;
- and
- wherein each push-pull circuit comprises at least two gate types.
5 more elements
Dependencies are inferred from the claim text.