US 11,444,612 B2Granted

Comparator low power response

AssigneeTexas Instruments Incorporated

InventorsNitin Agarwal, Venkat Ramakrishna Saripalli, Venkata Ramanan R

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Abstract

In described examples, an amplifier can be arranged to generate a first stage output signal in response to an input signal. The input signal can be coupled to control a first current coupled from a first current source through a common node to generate the first stage output signal. A replica circuit can be arranged to generate a replica load signal in response to the input signal and in response to current received from the common node. A current switch can be arranged to selectively couple a second current from a second current source to the common node in response to the replica load signal.

Claims20

Dependent claims

A circuit comprising:

a differential input that includes a first input and a second input;
an amplifier stage that includes a first set of input transistors coupled to a common node, wherein the first set of input transistors includes a first transistor that includes a gate coupled to the first input, and a second transistor that includes a gate coupled to the second input;
a second set of input transistors coupled between the common node and a replica node, wherein the second set of input transistors includes a third transistor that includes a gate coupled to the first input, and a fourth transistor that includes a gate coupled to the second input;
a bias generator coupled to the replica node and a bias node;
and
a current switch that includes a fifth transistor that includes a gate coupled to the bias node, wherein the fifth transistor is coupled to the common node.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/223,097Filed 6 Apr 2021 · continuation
Priority: 8 Apr 2019
Published: US 2021/0226619 A122 Jul 2021
Granted: 13 Sep 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

H03F 3/45183
Using MOSFET transistors as the active amplifying circuit: long tailed pairs
H03K 5/2481
Using field effect transistors: with at least one differential stage
H03F 1/0205
Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation: in transistor amplifiers
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

Application16/378,526Parent of this continuation · filed 8 Apr 2019
US 2021/0226619 A1Pre-grant publication · published 22 Jul 2021
US 10,972,086 B2Parent of this continuation
US 2020/0321952 A1Published application
US 11,444,612 B2This patent

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

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