According to an embodiment, a light-receiving circuit includes a MOSFET, a first light-receiving element and a second light-receiving element. The first light-receiving element controls a state of the MOSFET between ON state and OFF state by applying a voltage induced by a light signal between a gate of the MOSFET and a source of the MOSFET; and a second light-receiving element controls a threshold voltage of the MOSFET.

Light receiving circuit

The disclosed systems and methods utilize an advanced linearized trans-impedance amplifier (ATIA) that allows for the recovery and amplification of low amplitude analog and digital signals. This disclosure further describes unique approaches of addressing issues inherent in the transmission and reception of small amplitude multi-carrier signals used for distribution of voice, video, and data communications over both fiber optic cables and free space transmitters.

Linearized trans-impedance amplifier

In one aspect, the invention features a fiber optic receiver that includes a preamplifier circuit incorporated together with an opto-electronic transducer in a receiver optical sub-assembly (ROSA), and an adjustable bandwidth post-amplifier that is located outside the ROSA to allow the overall size of the receiver package to be reduced. The ROSA is mounted on a substrate and is fitted with a fiber optic connector for coupling to a mating connector of a fiber optic cable. The opto-electronic transducer is incorporated within the ROSA and is configured to generate an electrical data signal in response to a received optical data signal. The preamplifier circuit is incorporated within the ROSA and is operable to linearly amplify an electrical data signal generated by the opto-electronic transducer. The adjustable bandwidth post-amplifier circuit is mounted on the substrate and is coupled to an output of the preamplifier circuit.

Fiber optic receiver with an adjustable bandwidth post-amplifier

A fiber optic receiver that includes an opto-electronic transducer, an adjustable response preamplifier circuit, and a post-amplifier circuit is described. The opto-electronic transducer is configured to generate an electrical data signal in response to a received optical data signal. The adjustable response preamplifier circuit is coupled to the opto-electronic transducer and is operable to amplify an electrical data signal generated by the opto-electronic transducer. The post-amplifier circuit is coupled to an output of the preamplifier circuit and is configured to transmit a mode control signal to the preamplifier circuit in response to a received control signal. By transmitting the mode control signal from the post-amplifier to the preamplifier, the adjustable response amplifier may be placed in the preamplifier stage within a receiver optical sub-assembly (ROSA). As a result, the fiber optic receiver may accommodate multiple operating modes (e.g., multiple bandwidth and power operating modes) while conforming to existing receiver optical sub-assembly (ROSA) size and pin count constraints.

Fiber optic receiver with an adjustable response preamplifier

The application discloses a differential amplifier with selectable gain. The differential amplifier comprises a pair of input transistors, a first pair of load transistors and a second pair of load transistors. The drain-source-paths of the first pair of load transistors is connected between a reference potential and the two output terminals of the pair of input transistors, while the gates are commonly connected to a control voltage. The drain-source-paths of the second pair of load transistors os connected in parallel to the drain-source-paths of the first pair of load transistors. Through a control circuit, the gates of the second pair of load transistors are either connected to the reference potential (second pair deactivated) or cross coupled to the output terminals of the pair of input transistors (second pair activated) to provide positive feedback. By activating/deactivating the second pair of load transistors, the gain of the differential amplifier is coarsely switched between a high gain mode a low gain mode, while a fine adjustment of the gain can be obtained by altering.

Amplifier apparatus, method, and system

An amplifier circuit (20) for a photodetector includes a transconductance variable gain stage (32). The transconductance variable gain stage (32) has an input (34) capable of connecting to the photedetector and an output (40). A transconductance gain stage (44) has an input (42) connected to the output (40) of the transconductance variable gain stage (32). A feedback resistor (46) is connected between an output (48) of the transconductance gain stage (44) and the input (42) of the transconductance gain stage (44).

Preamplifier circuit for a photodetector

A parasitically compensated resistor (50) for integrated circuits includes a substrate (52). A polysilicon resistor (54) is formed in the substrate (52). The polysilicon resistor (54) has a first end connected to a first lead (56) and a second end connected to a second lead (58). A conductive layer (62) is capacitively connected to the polysilicon resistor (54).

Parasitically compensated resistor for integrated circuits

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Preamplifier circuit for a photodetector

Parasitically compensated resistor for integrated circuits