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US 7,002,409 B1Granted
Compensation circuit for amplifiers having multiple stages
AssigneeMarvell International Ltd.
InventorFarbod Aram
Life of this patent
Estimating the term…
Abstract
A compensation circuit is provided for an amplifier including at least first and second amplifier stage. The circuit includes a first capacitance including one end that communicates with an input of the first amplifier stage. An amplifier includes a first gain, an input that communicates with an opposite end of the first capacitance, and an output. A second capacitance includes a first end that communicates with the output of the amplifier and an opposite end that communicates with an input of the second amplifier stage. A first impedence includes one end that communicates with the input of the first amplifier stage and an opposite end that communicates with an output of the second amplifier stage.
Claims29
A compensation circuit for an amplifier including at least first and second amplifier stages, comprising:
- a first capacitance having one end that communicates with an input of the first amplifier stage;
- an amplifier having a first gain, an input that communicates with an opposite end of said first capacitance, and an output;
- and
- a second capacitance having a first end that communicates with said output of said amplifier and an opposite end that communicates with an input of the second amplifier stage;
- and
- a first impedance having one end that communicates with the input of the first amplifier stage and an opposite end that communicates with an output of the second amplifier stage.
3 more elements
A compensation circuit for an amplifier including at least first and second amplifier stages, comprising:
- a first capacitance having one end that communicates with an input of the first amplifier stage;
- an amplifier having a first gain, an input that communicates with an opposite end of said first capacitance, and an output and that includes:
- a current source;
- and
- a transimpedance amplifier having an output and an input that communicates with said current source;
- and
- a second capacitance having a first end that communicates with said output of said amplifier and an opposite end that communicates with an input of the second amplifier stage,
- wherein said current source includes:
- a first transistor including a control terminal and first and second terminals;
- a bias resistance having one end that communicates with said control terminal of said first transistor and an opposite end that communicates with said first terminal of said first transistor;
- and
- a current source that communicates with said first terminal.
9 more elements
A compensation circuit for an amplifier including at least first and second amplifier stages, comprising:
- a first capacitance having one end that communicates with an input of the first amplifier stage:
- an amplifier having a first gain, an input that communicates with an opposite end of said first capacitance, and an output and that includes:
- a current source;
- and
- a transimpedance amplifier having an output and an input that communicates with said current source;
- and
- a second capacitance having a first end that communicates with said output of said amplifier and an opposite end that communicates with an input of the second amplifier stage,
- wherein said transimpedance amplifier includes:
- a first transistor having a control terminal and first and second terminals;
- a feedback resistance having one end that communicates with said control terminal and an opposite end that communicates with said first terminal;
- and
- a current source that communicates with said first terminal.
9 more elements
A compensation circuit for an amplifier including at least first and second amplifier stages, comprising:
- a first capacitance having one end that communicates with an input of the first amplifier stage;
- an amplifier having a first gain, an input that communicates with an opposite end of said first capacitance, and an output;
- a second capacitance having a first end that communicates with said output of said amplifier and an opposite end that communicates with an input of the second amplifier stage;
- and
- a broadband buffer having an input that communicates with said output of said amplifier and an output that communicates with said one end of said second capacitance.
2 more elements
A power supply, comprising:
- a first amplifier stage having an input and an output;
- a second amplifier stage having an input that communicates with said output of said first amplifier stage and an output;
- and
- a compensation circuit comprising:
- a first capacitance having one end that communicates with said input of said first amplifier stage;
- an amplifier having a first gain, an input that communicates with an opposite end of said first capacitance, and an output;
- a second capacitance having a first end that communicates with said output of said amplifier and an opposite end that communicates with said input of said second amplifier stage;
- and
- a first impedance having one end that communicates with the input of the first amplifier stage and a opposite end that communicates with an output of the second amplifier stage.
6 more elements
A power supply, comprising:
- a first amplifier stage having an input and an output;
- a second amplifier stage having an input that communicates with said output of said first amplifier stage and an output;
- and
- a compensation circuit comprising:
- a first capacitance having one end that communicates with said input of said first amplifier stage;
- an amplifier having a first gain, an input that communicates with an opposite end of said first capacitance, and an output and that includes:
- a current source;
- and
- a transimpedance amplifier having an output and an input that communicates with said current source;
- and
- a second capacitance having a first end that communicates with said output of said amplifier and an opposite end that communicates with said input of said second amplifier stage,
- wherein said current source includes:
- a first transistor including a control terminal and first and second terminals;
- a bias resistance having one end that communicates with said control terminal of said first transistor and an opposite end that communicates with said first terminal of said first transistor;
- and
- a current source that communicates with said first terminal.
13 more elements
A power supply, comprising:
- a first amplifier stage having an input and an output;
- a second amplifier stage having an input that communicates with said output of said first amplifier stage and an output;
- and
- a compensation circuit comprising:
- a first capacitance having one end that communicates with said input of said first amplifier stage;
- an amplifier having a first gain, an input that communicates with an opposite end of said first capacitance, and an output and that includes:
- a current source;
- and
- a transimpedance amplifier having an output and an input that communicates with said current source;
- and
- a second capacitance having a first end that communicates with said output of said amplifier and an opposite end that communicates with said input of said second amplifier stage,
- wherein said transimpedance amplifier includes:
- a first transistor having a control terminal and first and second terminals;
- a feedback resistance having one end that communicates with said control terminal and an opposite end that communicates with said first terminal;
- and
- a current source that communicates with said first terminal.
13 more elements
A power supply, comprising:
- a first amplifier stage having an input and an output;
- a second amplifier stage having an input that communicates with said output of said first amplifier stage and an output;
- and
- a compensation circuit comprising:
- a first capacitance having one end that communicates with said input of said first amplifier stage;
- an amplifier having a first gain, an input that communicates with an opposite end of said first capacitance, and an output;
- a second capacitance having a first end that communicates with said output of said amplifier and an opposite end that communicates with said input of said second amplifier stage;
- and
- a broadband buffer having an input that communicates with said output of said amplifier and an output that communicates with said one end of said second capacitance.
6 more elements
A broadband inverter, comprising:
- a first transistor having a control terminal and first and second terminals;
- a second transistor having a control terminal, a first terminal that communicates with said second terminal of said first transistor, and a second terminal;
- third, fourth, and fifth transistors each having a control terminal and first and second terminals, wherein said control terminal of said third transistor communicates with said control terminal of said second transistor, said first terminal of said third transistor communicates with said control terminal of said fourth transistor, said first terminal of said fourth transistor communicates with said control terminal of said fifth transistor, and said first terminal of said first transistor communicates with said first terminal of said fifth transistor;
- and
- a feedback capacitance having one end that communicates with said first terminal of said first transistor and an opposite end that communicates with said control terminals of said second and third transistors.
2 more elements
Dependencies are inferred from the claim text.