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US 7,023,271 B1Granted
Variable-gain constant-bandwidth transimpedance amplifier
AssigneeMarvell International Ltd.
InventorFarbod Aram
Life of this patent
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Abstract
A transimpedance amplifier (TIA) circuit according to the present invention includes a first opamp having an input and an output. A second opamp has an input that communicates with the first opamp and an output. A first feedback path communicates with the input and the output of the first opamp and includes a first resistance. A second feedback path communicates with the input and the output of the second opamp and includes a second resistance. A third feedback path communicates with the input of the first opamp and the output of the second opamp.
Claims43
A transimpedance amplifier (TIA) circuit, comprising:
- a first opamp having an input and an output;
- a second opamp having an input that communicates with an output of said first opamp and an output;
- a first feedback path that communicates with said input and said output of said first opamp and that includes a first resistance;
- a second feedback path that communicates with said input and said output of said second opamp and that includes a second resistance;
- and
- a third feedback path that communicates with said input of said first opamp and said output of said second opamp,
- wherein said first and second resistances are variable resistances that have resistance values that decrease as frequency increases.
4 more elements
A transimpedance amplifier (TIA) circuit, comprising:
- a first opamp having an input and an output;
- a second opamp having an input that communicates with an output of said first opamp and an output;
- a first feedback path that communicates with said input and said output of said first opamp and that includes a first resistance;
- a second feedback path that communicates with said input and said output of said second opamp and that includes a second resistance;
- and
- a third feedback path that communicates with said input of said first opamp and said output of said second opamp,
- wherein said first feedback path includes a first capacitance in parallel with said first resistance and wherein said second feedback path includes a second capacitance in parallel with said second resistance.
4 more elements
A transimpedance amplifier (TIA) circuit, comprising:
- a first opamp having an input and an output;
- a second opamp having an input that communicates with an output of said first opamp and an output;
- a first feedback path that communicates with said input and said output of said first opamp and that includes a first resistance;
- a second feedback path that communicates with said input and said output of said second opamp and that includes a second resistance;
- a third feedback path that communicates with said input of said first opamp and said output of said second opamp;
- and
- a third opamp having an input that communicates with said output of said first opamp and an output that communicates with said input of said second opamp.
4 more elements
A transimpedance amplifier (TIA) circuit, comprising:
- a first opamp having an input and an output;
- a second opamp having an input that communicates with an output of said first opamp and an output;
- a first feedback path that communicates with said input and said output of said first opamp and that includes a first resistance;
- a second feedback path that communicates with said input and said output of said second opamp and that includes a second resistance;
- a third feedback path that communicates with said input of said first opamp and said output of said second opamp;
- and
- a sixth capacitance that communicates with said output of said second opamp.
4 more elements
A transimpedance amplifier (TIA) circuit, comprising:
- first amplifying means for amplifying and having an input and an output;
- second amplifying means for amplifying and having an input that communicates with said first amplifying means and an output;
- first feedback means for providing feedback and that communicates with said input and said output of said first amplifying means and that includes first resistance means for providing a resistance;
- second feedback means for providing feedback and that communicates with said input and said output of said second amplifying means and that includes a second resistance means;
- and
- third feedback means for providing feedback and that communicates with said input of said first amplifying means and said output of said second amplifying means,
- wherein said first and second resistance means provide variable resistances that decrease as frequency increases.
4 more elements
A transimpedance amplifier (TIA) circuit, comprising:
- first amplifying means for amplifying and having an input and an output;
- second amplifying means for amplifying and having an input that communicates with said first amplifying means and an output;
- first feedback means for providing feedback and that communicates with said input and said output of said first amplifying means and that includes first resistance means for providing a resistance;
- second feedback means for providing feedback and that communicates with said input and said output of said second amplifying means and that includes a second resistance means;
- and
- third feedback means for providing feedback and that communicates with said input of said first amplifying means and said output of said second amplifying means,
- wherein said first feedback means includes first capacitance means for providing capacitance in parallel with said first resistance means and wherein said second feedback means includes second capacitance means for providing capacitance in parallel with said second resistance means.
4 more elements
A transimpedance amplifier (TIA) circuit, comprising:
- first amplifying means for amplifying and having an input and an output;
- second amplifying means for amplifying and having an input that communicates with said first amplifying means and an output;
- first feedback means for providing feedback and that communicates with said input and said output of said first amplifying means and that includes a resistor;
- second feedback means for providing feedback and that communicates with said input and said output of said second amplifying means and that includes a second resistance means;
- third feedback means for providing feedback and that communicates with said input of said first amplifying means and said output of said second amplifying means;
- and
- third amplifying means for amplifying and having an input that communicates with said output of said first amplifying means and an output that communicates with said input of said second amplifying means.
4 more elements
A transimpedance amplifier (TIA) circuit, comprising:
- first amplifying means for amplifying and having an input and an output;
- second amplifying means for amplifying and having an input that communicates with said first amplifying means and an output;
- first feedback means for providing feedback and that communicates with said input and said output of said first amplifying means and that includes first resistance means for providing a resistance;
- second feedback means for providing feedback and that communicates with said input and said output of said second amplifying means and that includes a second resistance means;
- third feedback means for providing feedback and that communicates with said input of said first amplifying means and said output of said second amplifying means;
- and
- sixth capacitance means for providing capacitance and that communicates with said output of said second amplifying means.
4 more elements
A method for operating a transimpedance amplifier (TIA) circuit, comprising:
- providing first and second amplifier stages, each having inputs and outputs;
- feeding back an output of said first amplifier stage to said input of said first amplifier stage via a first resistance;
- feeding back an output of said second amplifier stage to said input of said first amplifier stage via a second resistance;
- feeding back said output of said second amplifier stage to said first amplifier stage;
- and
- lowering a first resistance value of said first resistance at high frequencies relative to said first resistance value low frequencies.
3 more elements
A method for operating a transimpedance amplifier (TIA) circuit, comprising:
- providing first and second amplifier stages, each having inputs and outputs;
- feeding back an output of said first amplifier stage to said input of said first amplifier stage via a first resistance;
- feeding back an output of said second amplifier stage to said input of said first amplifier stage via a second resistance;
- feeding back said output of said second amplifier stage to said first amplifier stage;
- and
- lowering a second resistance value of said second resistance at high frequencies relative to said second resistance value low frequencies.
3 more elements
A method for operating a transimpedance amplifier (TIA) circuit, comprising:
- providing first and second amplifier stages, each having inputs and outputs;
- feeding back an output of said first amplifier stage to said input of said first amplifier stage via a first resistance;
- feeding back an output of said second amplifier stage to said input of said first amplifier stage via a second resistance;
- feeding back said output of said second amplifier stage to said first amplifier stage;
- and
- providing a third amplifier stage between said first and second amplifier stages.
3 more elements
A method for operating a transimpedance amplifier (TIA) circuit, comprising:
- providing first and second amplifier stages, each having inputs and outputs;
- feeding back an output of said first amplifier stage to said input of said first amplifier stage via a first resistance;
- feeding back an output of said second amplifier stage to said input of said first amplifier stage via a second resistance;
- feeding back said output of said second amplifier stage to said first amplifier stage;
- and
- implementing said first resistance using a third resistance in parallel with a first capacitance and a fourth resistance in series with said third resistance.
3 more elements
A method for operating a transimpedance amplifier (TIA) circuit, comprising:
- providing first and second amplifier stages, each having inputs and outputs;
- feeding back an output of said first amplifier stage to said input of said first amplifier stage via a first resistance,
- feeding back an output of said second amplifier stage to said input of said first amplifier stage via a second resistance;
- feeding back said output of said second amplifier stage to said first amplifier stage;
- and
- implementing said second resistance using a fifth resistance in parallel with a second capacitance and a sixth resistance in series with said fifth resistance.
3 more elements
Dependencies are inferred from the claim text.