Optical receivers with dc cancellation bias circuit and embedded offset cancellation
US-10498461-B1 · Dec 3, 2019 · US
Optical receiving circuit
US9025971B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9025971-B2 |
| Application number | US-201314092125-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 27, 2013 |
| Priority date | Jan 10, 2013 |
| Publication date | May 5, 2015 |
| Grant date | May 5, 2015 |
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Abstract
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An optical receiving circuit includes: a first non-feedback amplifier configured to convert a current signal, obtained from a light receiving element in response to an optical signal, into a first voltage signal; a second amplifier configured to convert an input current signal into a second voltage signal, the output signal not being directly fed back to an input side; a differential amplifier configured to perform differential amplification on the first voltage signal and the second voltage signal and to output an in positive signal and a negative signal obtained through the differential amplification; and an offset compensation circuit configured to input, on the basis of the in positive signal and the negative signal output from the differential amplifier, an offset current signal in accordance with an offset of a level of the in positive signal from a level of the negative signal to the second amplifier.
First claim
Opening claim text (preview).
What is claimed is: 1. An optical receiving circuit, comprising: a first amplifier configured to convert a current signal, which is input at an input side of the first amplifier and which is a result of a reception, performed by an optical receiving element, of an optical signal, into a voltage signal and to output the voltage signal, the output signal not being directly fed back to the input side of the first amplifier; a second amplifier configured to convert a current signal,…
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Electricity · mapped topic
Electricity · mapped topic
- H04B10/6933Primary
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
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Frequently asked questions
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- What does patent US9025971B2 cover?
- An optical receiving circuit includes: a first non-feedback amplifier configured to convert a current signal, obtained from a light receiving element in response to an optical signal, into a first voltage signal; a second amplifier configured to convert an input current signal into a second voltage signal, the output signal not being directly fed back to an input side; a differential amplifier …
- Who is the assignee on this patent?
- Fujitsu Ltd
- What technology area does this patent fall under?
- Primary CPC classification H04B10/6933. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue May 05 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).