Adaptive Slew-Rate Amplifier for Fast Settling and Low Noise

Solution Overview

Problem

Conventional amplifiers face a trade-off between settling quickly and introducing low noise, often settling quickly at the cost of high noise levels or settling slowly with low noise.

Innovation Solution

An amplifier design that uses a high bandwidth component for initial slew rate enhancement based on detected imbalance, then disengages it to allow a low bandwidth component to operate with minimal noise on the input signal, combining fast settling with low noise introduction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If conventional amplifiers are designed to settle quickly, then settling speed is improved, but noise levels increase

Engineering Contradiction:

Improvesettling speedVSAvoidnoise levels

Core Design Contradiction:

SpeedVSObject-generated harmful factors

Solution Approach 1:

The amplifier is divided into two distinct components: a high bandwidth amplifier for fast settling and a low bandwidth amplifier for low noise operation. This segmentation allows each component to be optimized for its specific function, resolving the contradiction between settling speed and noise levels.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically switches between the high bandwidth and low bandwidth amplifiers based on the operational phase. During the initial transient phase, the high bandwidth amplifier is engaged for fast settling. Once settling is complete, the system transitions to the low bandwidth amplifier for low noise signal processing. This dynamic adaptation resolves the contradiction by applying different amplifier characteristics at different times.

Inventive Principle:

Principle #15Dynamics

2Object-generated harmful factors

If conventional amplifiers are designed to introduce low noise, then noise levels are reduced, but settling speed decreases

Engineering Contradiction:

Improvenoise levelsVSAvoidsettling speed

Core Design Contradiction:

Object-generated harmful factorsVSSpeed

Solution Approach 1:

The amplifier is divided into two distinct components: a high bandwidth amplifier for fast settling and a low bandwidth amplifier for low noise operation. This segmentation allows each component to be optimized for its specific function, resolving the contradiction between settling speed and noise levels.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically switches between the high bandwidth and low bandwidth amplifiers based on the operational phase. During the initial transient phase, the high bandwidth amplifier is engaged for fast settling. Once settling is complete, the system transitions to the low bandwidth amplifier for low noise signal processing. This dynamic adaptation resolves the contradiction by applying different amplifier characteristics at different times.

Inventive Principle:

Principle #15Dynamics

3Device complexity

If a single amplifier component is used for both fast settling and low noise operation, then device complexity is reduced, but performance compromise occurs

Engineering Contradiction:

Improveamplifier structureVSAvoidsignal quality

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The amplifier is divided into two distinct components: a high bandwidth amplifier for fast settling and a low bandwidth amplifier for low noise operation. This segmentation allows each component to be optimized for its specific function, resolving the contradiction between settling speed and noise levels.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The high bandwidth and low bandwidth amplifiers are combined in a single amplifier system with a switching mechanism. This merging allows the system to achieve both fast settling and low noise performance by appropriately selecting which amplifier component is active at any given time, avoiding the need for separate systems while maintaining high signal quality.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS8593218B2Fast settling low power low noise amplifier

Publication Date: 2013.11.26 ANALOG DEVICES INC

AI summary

Aspects of the present invention provide apparatuses and methods to provide slew rate enhancement during an initial stage of operation of an amplifier and processing of an input signal with low noise introduction during a subsequent amplification stage of operation. During the initial stage, a high bandwidth component of the amplifier can be engaged to provide slew rate enhancement of the overall amplifier. The adaptive slew rate enhancement can be based on a detected imbalance of an output of a low bandwidth component of the amplifier. Once a desired operating state of the amplifier is achieved, the high bandwidth component can be disengaged. The low bandwidth component can then solely operate on a received input signal during the amplification stage. The low bandwidth component can be low power and can introduce low levels of noise, thereby ensuring minimal noise introduction and corruption of the amplified output signal of the amplifier.