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US 6,297,701 B1Granted
Wide dynamic range transimpedance amplifier
AssigneeNortel Networks Limited
InventorsPasqualino Michelle Visocchi, Robin M Flett
Life of this patent
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Abstract
An integrated circuit transimpedance amplifier for an optical receiver is formed by a bipolar process comprising fixed value resistive elements in a network to provide AGC. The resistive elements are arranged in a parallel configuration and a transistor switching network is provided to enable at least one of said elements to be isolated from a gain stage of the amplifier thereby providing a means of varying amplifier gain.
Claims12
A bipolar integrated circuit (IC) transimpedance amplifier for an optical receiver comprises:
- an input for receiving an input current signal from a photo detector;
- a gain stage for amplifying the input current;
- and
- a resistor network coupling the output and the input for receiving an input current_signal of the gain stage, the resistor network comprising at least first and second resistive elements in a parallel arrangement and being arranged such that one of said resistive elements can be isolated from the output of the gain stage by means of a transistor switching network.
1 more element
An optical receiver for a telecommunications system comprising:
- a transimpedance amplifier having an input for receiving an input current signal from a photo detector, a gain stage for amplifying the input current and a resistor network coupling the output and the input for receiving an input current signal of the gain stage, the resistor network comprising at least first and second resistive elements in a parallel arrangement and being arranged such that one of said resistive elements can be isolated from the output of the gain stage by means of a transistor switching network;
- and
- an integrator circuit for providing a voltage control signal for controlling the transistor switching network.
Dependencies are inferred from the claim text.