US 11,309,845 B2Granted

Reconfigurable optical receivers for extended maximum input signals

AssigneeNokia Solutions and Networks Oy

InventorsAriel Leonardo Vera Villarroel, Abdelrahman Ahmed, Alexander Rylyakov

Life of this patent

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Abstract

In optical receivers, extending the transimpedance amplifier's (TIA) dynamic range is a key to increasing the receiver's dynamic range, and therefore increase the channel capacity. Ideally, the TIA requires controllable gain, whereby the receiver can modify the characteristics of the TIA and/or the VGA to process high power incoming signals with a defined maximum distortion, and low power incoming signals with a defined maximum noise. A solution to the problem is to provide TIA's with reconfigurable feedback resistors, which are adjustable based on the level of power, e.g. current, generated by the photodetector, and variable load resistors, which are adjustable based on the change in impedance caused by the change in the feedback resistor.

Claims20

Dependent claims

A trans-impedance amplifier (TIA) configured for converting an input current into an output voltage, comprising:

a first feedback loop including:
a first input for receiving the input current;
a first transistor including a first terminal and a second terminal, the first terminal connected to the first input, and the second terminal connected to a first output;
and
a first variable feedback resistor between the first terminal and the second terminal;
a first variable load resistor connected between a voltage source and the second terminal;
and
a gain control circuit configured for transmitting a first feedback resistor control signal for reconfiguring a first feedback resistance of the first variable feedback resistor for adjusting gain of the TIA, and configured for transmitting a first variable load resistor control signal to the first variable load resistor for reconfiguring a first load resistance of the first variable load resistor;
wherein the gain control circuit is also configured for sensing an output of the TIA, and based on the output of the TIA adjusting, at least, one of the first variable load resistor and the first variable feedback resistor.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/838,289Filed 2 Apr 2020 · continuation
Priority: 10 Sep 2018
Published: US 2020/0083846 A123 Jul 2020
Granted: 19 Apr 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification17 codes

H03F 1/086
In transistor amplifiers: with FET's
H03F 1/34
Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements:…
H03F 3/45085
Using bipolar transistors as the active amplifying circuit: long tailed pairs
H03F 3/45179
Characterised by the way of implementation of the active amplifying circuit in the differential amplifier: using MOSFET transistors as the active…

Family

Application16/126,797Parent of this continuation · filed 10 Sep 2018
US 2020/0235705 A1Pre-grant publication · published 23 Jul 2020
US 10,644,652 B2Parent of this continuation
US 2020/0083846 A1Published application
US 11,309,845 B2This patent

From the US filing history. Foreign family members aren’t listed.

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