Adaptive Filter Circuit Switching for Low-Power Fast Startup

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Solution Overview

Problem

Existing filters, particularly in wireless communication systems, face challenges with high power consumption and prolonged startup times due to the use of solely active filter circuits, making them unsuitable for applications like Wi-Fi or Bluetooth.

Innovation Solution

A filter system that dynamically switches between active and passive filter circuits based on input signal amplitude, using a series of filter circuits where active circuits are preset to be active but adjust to passive mode when necessary to reduce power consumption and eliminate startup stabilization time.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If active filter circuits are used, then filtering performance is improved, but power consumption increases and startup time increases

Engineering Contradiction:

Improvefiltering performanceVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The filter circuit dynamically switches between active and passive modes based on signal amplitude. When signal amplitude exceeds a threshold, the circuit transitions from active filter mode (high performance) to passive filter mode (low power), resolving the contradiction between filtering performance and power consumption through adaptive operational states

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The circuit changes its operational parameters by switching between active and passive configurations. The amplifier's operating state is modified based on input signal characteristics, allowing the filter to adapt its power consumption and performance characteristics to match actual operating conditions

Inventive Principle:

Principle #35Parameter changes

2Reliability

If active filter circuits are used, then filtering performance is improved, but startup stabilization time increases

Engineering Contradiction:

Improvefiltering performanceVSAvoidstartup stabilization time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The filter circuit employs dynamic mode switching where passive filter circuits provide immediate signal processing without requiring amplifier stabilization, while active filter circuits engage only when higher performance is needed. This reduces startup stabilization time while maintaining filtering performance when required

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system preliminarily configures passive filter circuits that can operate immediately without stabilization time, providing basic filtering functionality during startup. Active filter circuits are activated only when signal amplitude warrants their use, eliminating unnecessary stabilization delays

Inventive Principle:

Principle #10Preliminary action

3Use of energy by moving object

If passive filter circuits are used, then power consumption is reduced, but filtering performance deteriorates

Engineering Contradiction:

Improvepower consumptionVSAvoidfiltering performance

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The filter system dynamically adapts its configuration based on signal amplitude. When signal amplitude is low, passive filter circuits suffice for power savings. When signal amplitude exceeds the threshold, active filter circuits are activated to maintain filtering performance, thus resolving the trade-off between power consumption and performance through conditional operation

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS11277117B2Filter, filtering method, and filter system

Publication Date: 2022.03.15 REALTEK SEMICON CORP

AI summary

A filter includes multiple filter circuits. The filter circuits are coupled in series between an input terminal and an output terminal, to generate an output signal according to an input signal. One of the filter circuits operates as an active filter circuit or a passive filter circuit according to amplitude of the input signal.