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US 7,406,268 B2Granted
Optical receiver circuit
AssigneeAvago Technologies, Ltd.
InventorKarl Schrödinger
Life of this patent
Estimating the term…
Abstract
An optical receiver circuit is constructed to be immune to interference from external interference signals. The optical receiver circuit includes a differential amplifier having an optical reception device connected to one input of the differential amplifier. The optical receiver circuit also includes an electrical element for simulating the electrical behavior of the reception device in the illumination-free state. The electrical element is connected to the other input of the differential amplifier.
Claims18
An optical receiver circuit, comprising:
- a differential amplifier including a first input and a second input;
- an optical reception device connected to said first input of said differential amplifier by a first preamplifier said optical reception device having an electrical behavior in an illumination-free case;
- an electrical element for simulating the electrical behavior of said optical reception device in the illumination-free case, said electrical element connected to said second input of said differential amplifier by a second preamplifier;
- and
- said first preamplifier and said second preamplifier being identical user-settable transimpedance amplifiers.
2 more elements
An optical receiver circuit, comprising:
- a differential amplifier including a first input and a second input;
- an optical reception device connected to said first input of said differential amplifier by a first preamplifier, said optical reception device having an electrical behavior in an illumination-free case;
- an electrical element for simulating the electrical behavior of said optical reception device in the illumination-free case, said electrical element connected to said second input of said differential amplifier by a second preamplifier;
- and
- said first preamplifier and said second preamplifier being identical;
- an integrated control circuit;
- said first preamplifier being a transimpendance amplifier having a feedback impedance with a magnitude being settable by a user via said integrated control circuit;
- and
- said second preamplifier being a transimpedance amplifier having a feedback impedance with a magnitude being settable by a user via said integrated control circuit.
6 more elements
An optical receiver circuit, comprising:
- a differential amplifier including a first input and a second input;
- an optical reception device connected to said first input of said differential amplifier by a first preamplifier;
- a dummy optical reception device connected to said second input of said differential amplifier by a second preamplifier;
- and
- an integrated control circuit adapted to enable a user to externally control transimpendance characteristics of the first and second preamplifiers.
2 more elements
Dependencies are inferred from the claim text.