US 11,894,811 B2Granted

Operational amplifier, radio frequency circuit, and electronic device

AssigneeHuawei Technologies Co., Ltd.

InventorsTaotao Yan, Kerou Wang, Wei Wu

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Abstract

An operational amplifier includes a first amplifying unit, a second amplifying unit, a current source, a first compensation capacitor, and a second compensation capacitor. The first amplifying unit includes a first input transistor, a second input transistor, a third input transistor, and a fourth input transistor. The second amplifying unit includes a fifth input transistor, a sixth input transistor, a seventh input transistor, and an eighth input transistor. One end of the first compensation capacitor is coupled to a drain of the seventh input transistor, and the other end of the first compensation capacitor is coupled to a gate of the eighth input transistor. One end of the second compensation capacitor is coupled to a drain of the eighth input transistor, and the other end of the second compensation capacitor is coupled to a gate of the seventh input transistor.

Claims20

Dependent claims

An operational amplifier, comprising:

a first amplifying unit;
a second amplifying unit coupled to the first amplifying unit;
a current source coupled to the first amplifying unit and comprising:
a first current source end;
and
a second current source end;
a first compensation capacitor coupled to the second amplifying unit;
a second compensation capacitor coupled to the second amplifying unit;
a first input end coupled to the first current source end;
a second input end;
a first voltage input end coupled to the first amplifying unit and the second amplifying unit, wherein the first voltage input end is a first differential voltage signal input end;
and
a second voltage input end coupled to the first amplifying unit and the second amplifying unit, wherein the second voltage input end is a second differential voltage signal input end,
wherein the first amplifying unit comprises:
a first transistor coupled to the first voltage input end and comprising:
a first source coupled to the second current source end;
a first gate;
and
a first drain;
a second transistor coupled to the second voltage input end and comprising:
a second source coupled to the second current source end;
a second gate;
and
a second drain;
a third transistor comprising:
a third source coupled to the second input end;
a third gate;
and
a third drain;
and
a fourth transistor comprising:
a fourth source coupled to the second input end;
a fourth gate coupled to the gate of the third transistor;
and
a fourth drain,
wherein the second amplifying unit comprises:
a fifth transistor coupled to the second voltage input end and comprising:
a fifth source coupled to the first voltage end;
a fifth gate;
and
a fifth drain coupled to the first compensation capacitor, wherein the fifth drain is a first differential voltage signal output end and configured to output a first signal;
a sixth transistor coupled to the first voltage input end and comprising:
a sixth source coupled to the first voltage end;
a sixth gate;
and
a sixth drain coupled to the second compensation capacitor, wherein the sixth drain is a second differential voltage signal output end and configured to output a second signal that is different from the first signal;
a seventh transistor comprising:
a seventh source coupled to the second input end;
a seventh gate coupled to the second drain, the fourth drain, and the second compensation capacitor;
and
a seventh drain coupled to the first compensation capacitor;
and
an eighth transistor comprising:
an eighth source coupled to the second input end;
an eighth gate directly coupled to the first drain, the third drain, and the first compensation capacitor;
and
an eighth drain coupled to the second compensation capacitor.

54 more elements

A radio frequency circuit comprising:

an operational amplifier comprising:
a first amplifying unit;
a second amplifying unit coupled to the first amplifying unit;
a current source coupled to the first amplifying unit and comprising:
a first current source end;
and
a second current source end;
a first compensation capacitor coupled to the second amplifying unit;
a second compensation capacitor coupled to the second amplifying unit;
a first input end coupled to the first current source end;
a second input end;
a first voltage input end coupled to the first amplifying unit and the second amplifying unit, wherein the first voltage input end is a first differential voltage signal input end;
and
a second voltage input end coupled to the first amplifying unit and the second amplifying unit, wherein the second voltage input end is a second differential voltage signal input end,
wherein the first amplifying unit comprises:
a first transistor coupled to the first voltage input end and comprising:
a first source coupled to the second current source end;
a first gate;
and
a first drain;
a second transistor coupled to the second voltage input end and comprising:
a second source coupled to the second current source end;
a second gate;
and
a second drain;
a third transistor comprising:
a third source coupled to the second input end;
a third gate;
and
a third drain;
and
a fourth transistor comprising:
a fourth source coupled to the second input end;
a fourth gate coupled to the third gate;
and
a fourth drain,
wherein the second amplifying unit comprises:
a fifth transistor coupled to the second voltage input end and comprising:
a fifth source coupled to the first voltage end;
a fifth gate;
and
a fifth drain coupled to the first compensation capacitor, wherein the fifth drain is a first differential voltage signal output end and configured to output a first signal;
a sixth transistor coupled to the first voltage input end and comprising:
a sixth source coupled to the first voltage end;
a sixth gate;
and
a sixth drain coupled to the second compensation capacitor, wherein the sixth drain is a second differential voltage signal output end and configured to output a second signal that is different from the first signal;
a seventh transistor comprising:
a seventh source coupled to the second input end;
a seventh gate coupled to the second drain, the fourth drain, and the second compensation capacitor;
and
a seventh drain coupled to the first compensation capacitor;
and
an eighth transistor comprising:
an eighth source coupled to the second input end;
an eighth gate directly coupled to the first drain, the third drain, and the first compensation capacitor;
and
an eighth drain coupled to the second compensation capacitor.

55 more elements

An electronic device comprising:

a radio frequency circuit comprising an operational amplifier, wherein the operational amplifier comprises:
a first amplifying unit;
a second amplifying unit coupled to the first amplifying unit;
a current source coupled to the first amplifying unit and comprising:
a first current source end;
and
a second current source end;
a first compensation capacitor coupled to the second amplifying unit;
a second compensation capacitor coupled to the second amplifying unit;
a first input end coupled to the first current source end;
a second input end;
a first voltage input end coupled to the first amplifying unit and the second amplifying unit, wherein the first voltage input end is a first differential voltage signal input end;
and
a second voltage input end coupled to the first amplifying unit and the second amplifying unit, wherein the second voltage input end is a second differential voltage signal input end,
wherein the first amplifying unit comprises:
a first transistor coupled to the first voltage input end and comprising:
a first source coupled to the second current source end;
a first gate;
and
a first drain;
a second transistor coupled to the second voltage input end and comprising:
a second source coupled to the second current source end;
a second gate;
and
a second drain;
a third transistor comprising:
a third source coupled to the second input end;
a third gate;
and
a third drain;
and
a fourth transistor comprising:
a fourth source coupled to the second input end;
a fourth gate coupled to the third gate;
and
a fourth drain,
wherein the second amplifying unit comprises:
a fifth transistor coupled to the second voltage input end and comprising:
a fifth source coupled to the first voltage end;
a fifth gate;
and
a fifth drain coupled to the first compensation capacitor, wherein the fifth drain is a first differential voltage signal output end and configured to output a first signal;
a sixth transistor coupled to the first voltage input end and comprising:
a sixth source coupled to the first voltage end;
a sixth gate;
and
a sixth drain coupled to the second compensation capacitor, wherein the sixth drain is a second differential voltage signal output end and configured to output a second signal that is different from the first signal;
a seventh transistor comprising:
a seventh source coupled to the second input end;
a seventh gate coupled to the second drain, the fourth drain, and the second compensation capacitor;
and
a seventh drain coupled to the first compensation capacitor;
and
an eighth transistor comprising:
an eighth source coupled to the second input end;
an eighth gate directly coupled to the first drain, the third drain, and the first compensation capacitor;
and
an eighth drain coupled to the second compensation capacitor.

55 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/135,331Filed 28 Dec 2020 · continuation
Priority: 29 Jun 2018
Published: US 2021/0119586 A122 Apr 2021
Granted: 6 Feb 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

H03F 1/42
Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements: modifications of…
H03F 3/45475
Characterised by the way of implementation of the active amplifying circuit in the differential amplifier: using IC blocks as the active…
H03F 3/195
With semiconductor devices only: in integrated circuits
H03F 3/211
With semiconductor devices only: using a combination of several amplifiers