Floating Inverter Amplifier Gain Stabilization via Threshold-Tracking Voltage

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Solution Overview

Problem

The gain of a floating inverter amplifier is susceptible to environmental conditions such as operating voltage, process variation, and temperature due to variations in transistor threshold voltages.

Innovation Solution

An amplifying circuit with a voltage generating circuit that provides an operating voltage linearly correlated to the threshold voltage of transistors, modulating the operating voltage to track variations in threshold voltage and reduce the impact of environmental conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If a floating inverter amplifier is used to achieve high gain amplification, then the amplifying effect is improved, but the gain becomes susceptible to environmental conditions such as operating voltage, process variation, and temperature

Engineering Contradiction:

Improveamplifying effectVSAvoidgain stability

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The patent changes the operating voltage parameter dynamically to compensate for threshold voltage variations. The voltage generating circuit adjusts the operating voltage based on detected threshold voltage changes, thereby maintaining stable amplifier gain despite environmental variations. This directly applies parameter changes to resolve the contradiction between achieving high gain and maintaining gain stability.

Inventive Principle:

Principle #35Parameter changes

2Power

If the operating voltage is increased to improve the current generation capability of inverters, then the amplifying effect is enhanced, but the impact of threshold voltage variation on gain increases

Engineering Contradiction:

Improvecurrent generation capabilityVSAvoidthreshold voltage variation impact

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The patent implements a feedback mechanism where the voltage generating circuit continuously monitors threshold voltage variations and adjusts the operating voltage accordingly. This feedback loop ensures that the operating voltage is dynamically optimized to counteract threshold voltage variations, maintaining stable amplifier performance while preserving current generation capability.

Inventive Principle:

Principle #23Feedback

3Reliability

If the amplifier is designed to be insensitive to environmental conditions, then the gain stability is improved, but the amplifying effect and current generation capability are reduced

Engineering Contradiction:

Improvegain stabilityVSAvoidamplifying effect

Core Design Contradiction:

ReliabilityVSPower

Solution Approach 1:

The voltage generating circuit acts as an intermediary between the environmental conditions and the amplifier. It detects threshold voltage variations caused by environmental factors and introduces compensating voltage adjustments, thereby isolating the amplifier's gain from environmental influences while preserving its amplifying capability.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20250341851A1Amplifying circuit and voltage generating circuit

Publication Date: 2025.11.06 REALTEK SEMICON CORP

AI summary

An amplifying circuit includes a floating inverter amplifier and a voltage generating circuit. A threshold voltage of transistors in the floating inverter amplifier varies corresponding to an environmental condition. The voltage generating circuit is coupled with the floating inverter amplifier. The voltage generating circuit is configured to provide an operating voltage to the floating inverter amplifier. The operating voltage provided by the voltage generating circuit is linearly correlated to the threshold voltage, and the voltage generating circuit modulates a variation of the operating voltage to keep track with a variation of the threshold voltage.