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Amplifier with reduced power consumption and improved slew rate

An amplifier circuit and differential input technology, applied in the field of cascode amplifiers, can solve the problems of insufficient current circuit stability and other issues

Active Publication Date: 2020-07-21
ANALOG DEVICES INT UNLTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some examples, a cascode topology can be used with an amplifier that can accommodate an input signal that can swing all the way to one of the amplifier's supply rails, but this approach still suffers from current starvation and circuit stability issues

Method used

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  • Amplifier with reduced power consumption and improved slew rate
  • Amplifier with reduced power consumption and improved slew rate
  • Amplifier with reduced power consumption and improved slew rate

Examples

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Embodiment Construction

[0020] Among other things, this document describes an amplifier circuit that can be configured to receive a differential input signal having a common-mode component that can extend to at least one power supply rail for the amplifier circuit. The amplifier circuit may include an input stage, for example having a first differential pair of transistors, and the input stage may receive a differential input signal and in response conduct a differential first current to the cascode output stage. The cascode output stage may include or use a cascode control signal that is conditioned in response to the differential input signal. The cascode control signal may be independent of the transconductance of the first differential transistor pair. In one example, the amplifier circuit includes a slew boost circuit configured to source or sink current at the output of the amplifier based on the magnitude and polarity of the differential input signal.

[0021] In this document, a "supply sens...

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Abstract

An amplifier circuit can be configured to receive a differential input signal having a common mode component that can extend to at least one power supply rail for the amplifier circuit. The amplifiercircuit can include an input stage, such as having a first differential transistor pair, and the input stage can receive the differential input signal and in response conduct a differential first current to a cascode output stage. The cascode output stage can include or use a cascode control signal that is adjusted in response to the differential input signal. The cascode control signal can be independent of a transconductance of the first differential transistor pair. In an example, the amplifier circuit includes a slew boost circuit configured to source or sink current at an output of the amplifier based on a magnitude and polarity of the differential input signal.

Description

[0001] Cross References to Related Applications [0002] This application claims priority and benefit to U.S. Patent Application No. 62 / 791,268, filed January 11, 2019, and U.S. Patent Application No. 16 / 389,435, filed April 19, 2019, the entire contents of which are incorporated by reference at In this application. technical field [0003] The present invention relates to cascode amplifiers, and more particularly, to an amplifier with reduced power consumption and increased slew rate. Background technique [0004] Cascode amplifiers generally consist of two stages, where the common-emitter stage feeds the common-base stage. Folded cascode amplifiers can include or use a cascode topology with input common-mode levels close to the supply or rail voltages. In one example, a folded cascode differential amplifier can be used as an op amp input stage in both bipolar and CMOS designs. In some examples, a cascode topology can be used with an amplifier that can accommodate an inp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/02H03F3/20
CPCH03F1/02H03F3/20H03F3/45094H03F2203/45028H03F1/22H03F3/4508H03F1/0211H03F2203/45248H03F2203/45178H03F2203/45124H03F2203/45056
Inventor 阿西特·香卡
Owner ANALOG DEVICES INT UNLTD
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