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US 7,023,280 B2Granted
Transimpedance amplifier
AssigneeIntel Corporation
InventorsShivakumar Seetharaman, Lawrence L. Huang
Life of this patent
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Abstract
Disclosed is a transimpendance amplifier comprising a single ended input terminal to receive an input signal from a photodiode and differential output terminals. A circuit coupled between the single ended input terminal and a differential output terminal may vary the gain of the transimpedance amplifier in response to a DC current component of the input signal.
Claims16
A transimpendance amplifier comprising:
- a single ended input terminal to receive an input signal from a photodiode;
- at least one output terminal;
- a feedback circuit coupled between the single ended input terminal and at least one said output terminal, said feedback circuit is capable of varying a signal gain of a signal at said output terminal;
- a DC current detection circuit to detect a DC current component in the input signal;
- a circuit capable of varying said feedback circuit based on, at least in part, the detected DC current component in the input signal;
- and
- a circuit to vary an input capacitance at the single ended input terminal in response to the detected DC current component.
4 more elements
A transimpendance amplifier comprising:
- a single ended input terminal to receive an input signal from a photodiode;
- at least one output terminal;
- a feedback circuit coupled between the single ended input terminal and at least one said output terminal, said feedback circuit is capable of varying a signal gain of a signal at said output terminal;
- a DC current detection circuit to detect a DC current component in the input signal;
- and
- a circuit capable of varying said feedback circuit based on at least in part, the detected DC current component in the input signal;
- wherein said feedback circuit comprises a plurality of series coupled resistors coupled between the single ended input terminal and at least one said output terminal, wherein each resistor comprises a component resistance.
4 more elements
A transimpendance amplifier comprising:
- a single ended input terminal to receive an input signal from a photodiode;
- at least one output terminal;
- a feedback circuit coupled between the single ended input terminal and at least one said output terminal, said feedback circuit is capable of varying a signal gain of a signal at said output terminal;
- a DC current detection circuit to detect a DC current component in the input signal;
- a circuit capable of varying said feedback circuit based on, at least in part, the detected DC current component in the input signal;
- and
- a DC current removal circuit coupled to the single ended input terminal to substantially remove the DC current component.
4 more elements
A system comprising:
- a photodiode;
- a transimpedance amplifier coupled to the photodiode to provide a differential output signal;
- a data recovery circuit to provide a serial data signal in response to the differential output signal;
- and
- a deserializer to provide a parallel data signal in response to the serial data signal, wherein the transimpedance amplifier comprises:
- a single ended input terminal to receive an input signal from a photodiode;
- at least one output terminal;
- a feedback circuit coupled between the single ended input terminal and at least one said output terminal, said feedback circuit is capable of varying a signal gain of a signal at said output terminal;
- a DC current detection circuit to detect a DC current component in the input signal;
- and
- a circuit capable of varying said feedback circuit based on, at least in part, the detected DC current component in the input signal.
8 more elements
A method comprising:
- receiving an input signal from a photodiode at a single-ended input terminal of a transimpendance amplifier;
- transmitting an output signal from at least one output terminal of the transimpedance amplifier;
- detecting a DC current component in the input signal;
- varying a feedback circuit coupled between the input terminal and at least one output terminal based on at least in part the detected DC current component;
- and
- varying an input capacitance at the single ended input terminal in response to the detected DC current component.
3 more elements
Dependencies are inferred from the claim text.