Transimpedance amplifier and method for constructing same
First Claim
1. A transimpedance amplifier for processing a current signal received from a circuit device, comprising:
- a first stage coupled to an input node for receiving a current signal from a circuit device, the first stage including a first amplifier operable to drive the input node, and the first stage operable to provide a current signal to a second node in response to the current signal at the input node;
a second stage connected to the second node, the second stage including a second amplifier, and the second stage operable to convert the current signal at the second node into an output voltage signal at an output node; and
a feedback stage connected to the first stage and the second stage, the feedback stage operable to receive the output voltage, and the feedback stage further operable to provide a feedback current signal to cancel ambient noise in the current signal at the input node.
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Accused Products
Abstract
A transimpedance amplifier (10, 50) is provided for processing a current signal received from a circuit device (12, 52). The circuit device (12, 52) can be a photodiode used to receive infrared transmissions. The transimpedance amplifier (10, 50) includes a first stage (14, 54) coupled to an input node. The first stage (14, 54) has a first amplifier (20, 60) operable to drive the input node and is operable to provide a current signal to a second node (NODE 3, NODE 2) in response to a current signal in the input node. A second stage (16, 56) is connected to the second node (NODE 3, NODE 2). The second stage (16, 56) has a second amplifier (32, 68) and is operable to convert the current signal in the second node (NODE 3, NODE 2) into an output voltage signal (VOUT) at an output node. A feedback loop (18, 58) can be connected to receive the output voltage signal (VOUT) and to provide a feedback current signal to cancel ambient noise in the current signal in the input node.
49 Citations
18 Claims
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1. A transimpedance amplifier for processing a current signal received from a circuit device, comprising:
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a first stage coupled to an input node for receiving a current signal from a circuit device, the first stage including a first amplifier operable to drive the input node, and the first stage operable to provide a current signal to a second node in response to the current signal at the input node; a second stage connected to the second node, the second stage including a second amplifier, and the second stage operable to convert the current signal at the second node into an output voltage signal at an output node; and a feedback stage connected to the first stage and the second stage, the feedback stage operable to receive the output voltage, and the feedback stage further operable to provide a feedback current signal to cancel ambient noise in the current signal at the input node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for constructing a transimpedance amplifier for processing a current signal received from a circuit device, comprising;
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forming an input node for receiving a current signal from a circuit device; forming a first stage connected to the input node for receiving a current signal from a circuit device such that the first stage includes a first amplifier operable to drive the input node, and such that the first stage is operable to provide a current signal to a second node in response to the current signal at the input node; forming a second stage connected to the second node such that the second stage includes a second amplifier, and such that the second stage is operable to convert the current signal at the second node into an output voltage signal at an output node; and forming a feedback stage connected to the first stage and the second stage such that the feedback stage is operable to receive the output voltage, and such that the feedback stage is further operable to provide a feedback current signal to cancel ambient noise in the current signal at the input node. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification