Operational Amplifier with Dynamic Acceleration Controller

Solution Overview

Problem

Designing an operational amplifier that achieves high unit-gain bandwidth and high slew rate while ensuring stability is challenging, as compensation techniques typically reduce one or both of these parameters.

Innovation Solution

An operational amplifier with an adjustable core circuit featuring two amplification stages and different driving capabilities, controlled by an acceleration controller that dynamically selects the appropriate configuration based on internal state signals, enhancing driving capability during the slewing phase and reducing it during linear settling to optimize charge transfer efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If compensation technique is employed to ensure stability, then phase margin is improved, but unit-gain bandwidth and slew rate are reduced

Engineering Contradiction:

Improvephase marginVSAvoidunit-gain bandwidth and slew rate

Core Design Contradiction:

Stability of the object's compositionVSSpeed

Solution Approach 1:

The patent applies dynamics by making the driving capability of the operational amplifier adjustable through an acceleration controller that dynamically selects between different configurations (first configuration with enhanced driving capability and second configuration with normal driving capability) based on the operating phase, allowing the system to adapt its performance characteristics in real-time rather than being fixed

Inventive Principle:

Principle #15Dynamics

2Productivity

If high slew rate is achieved to improve charge transfer speed, then productivity is improved, but stability is compromised

Engineering Contradiction:

Improvecharge transfer speedVSAvoidcircuit stability

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The patent applies dynamics by making the driving capability of the operational amplifier adjustable through an acceleration controller that dynamically selects between different configurations (first configuration with enhanced driving capability and second configuration with normal driving capability) based on the operating phase, allowing the system to adapt its performance characteristics in real-time rather than being fixed

Inventive Principle:

Principle #15Dynamics

3Productivity

If high unit-gain bandwidth is achieved to improve circuit speed, then productivity is improved, but stability is compromised

Engineering Contradiction:

Improvecircuit speedVSAvoidcircuit stability

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The patent applies dynamics by making the driving capability of the operational amplifier adjustable through an acceleration controller that dynamically selects between different configurations (first configuration with enhanced driving capability and second configuration with normal driving capability) based on the operating phase, allowing the system to adapt its performance characteristics in real-time rather than being fixed

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS7403064B2Dynamically accelerated operational amplifier and method thereof

Publication Date: 2008.07.22 REALTEK SEMICON CORP

AI summary

An operational amplifier is dynamically accelerated depending on its internal state. Acceleration is disabled when the internal state indicates a risk of instability. When the internal state of the operational amplifier indicates no risk of instability, the acceleration is turned on to speed up the circuit operation.