Mixed Signal Integrator Saturation Prevention

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Solution Overview

Problem

Conventional analog integrators suffer from output saturation when faced with high-amplitude input signals, leading to inaccurate results due to sudden capacitor discharge, which introduces noise and increases power dissipation.

Innovation Solution

A mixed signal analog-digital integrator reverses the input signal when the output reaches a threshold, using a digital counter to track the integer part of the integral and combining it with the analog portion to prevent saturation, eliminating the need for capacitor-based resets.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If capacitor-based output reset is used to prevent saturation, then saturation is prevented, but power dissipation increases and noise is introduced due to sudden capacitor discharge

Engineering Contradiction:

Improvesaturation preventionVSAvoidpower dissipation

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

Instead of resetting the capacitor to zero when saturation is reached, the invention inverts the integrator output by swapping the connections of the capacitor terminals. This reversal prevents saturation by changing the integration direction without requiring capacitor discharge, thereby avoiding the power loss and noise associated with traditional reset methods.

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If capacitor-based output reset is used to prevent saturation, then saturation is prevented, but noise increases due to sudden capacitor discharge

Engineering Contradiction:

Improvesaturation preventionVSAvoidnoise

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The invention eliminates noise by inverting the integrator output through capacitor terminal swapping instead of discharging the capacitor. This approach prevents saturation without the sudden discharge event that generates noise, providing a clean signal while maintaining reliability.

Inventive Principle:

Principle #13The other way round (Inversion)

3Device complexity

If conventional analog integrator is used, then circuit simplicity is maintained, but output saturation occurs at supply voltage limits

Engineering Contradiction:

Improvecircuit simplicityVSAvoidoutput accuracy

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The invention maintains circuit simplicity by using a straightforward capacitor terminal swapping mechanism to prevent saturation. When the output reaches supply voltage limits, the inversion operation redirects the integration in the opposite direction, ensuring continuous accurate operation without complex additional circuits while preserving output accuracy.

Inventive Principle:

Principle #13The other way round (Inversion)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach prevents output saturation, reduces power dissipation, and minimizes noise by avoiding sudden capacitor discharge, allowing for accurate integration beyond the supply voltage limits and enhancing circuit reliability.

Implementation Method 1

Analog integrators produce output signals that are the time integrals of their input signals

Methodology Applied

Scientific EffectIntegration:

Implementation Method 2

a pre-charged capacitor will be used to reset the output, forcing the output to go to zero. Thus, there would be a sudden discharge for the capacitor of the analog integrator

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS9171189B2Systems and methods for preventing saturation of analog integrator output

Publication Date: 2015.10.27 THE TRUSTEES OF COLUMBIA UNIV IN THE CITY OF NEW YORK

AI summary

Systems and methods for preventing saturation of analog integrator outputs are provided. Applications of the systems and methods in hybrid analog-digital integrators are also provided. Exemplary systems include two switches, one operational amplifier, one capacitor C, four gain blocks, three comparators, one XOR gate, one OR gate, one T flip-flop, and one digital counter.