Programmable Power Amplifier LC Matching for Wider Bandwidth

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Solution Overview

Problem

Power amplifiers with capacitive components often reduce output power and frequency bandwidth, leading to inefficiencies in signal transmission.

Innovation Solution

Incorporating an inductance matching circuit coupled with an impedance matching circuit, which includes shunt inductors and switches, to adjust the center frequency and reduce reactive power consumption, thereby enhancing output power and frequency bandwidth.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If capacitive components are used in power amplifiers, then output power linearity across frequency range is improved, but output power and frequency bandwidth are reduced

Engineering Contradiction:

Improveoutput power linearityVSAvoidoutput power

Core Design Contradiction:

Manufacturing precisionVSPower

Solution Approach 1:

The patent changes the electrical parameters of the matching circuit by introducing inductance elements alongside capacitive elements. This parameter change transforms the circuit from being capacitive-dominated to having a balanced LC configuration, which resolves the contradiction by enabling both linearity and high output power through resonant frequency matching.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite matching circuit structure combining capacitive and inductive elements. This composite approach integrates the linearity benefits of capacitive components with the power-enhancing properties of inductive components, achieving both output power linearity and high output power simultaneously through the synergistic interaction of opposing electrical characteristics.

Inventive Principle:

Principle #40Composite materials

2Manufacturing precision

If capacitive components are used in power amplifiers, then output power linearity across frequency range is improved, but frequency bandwidth is reduced

Engineering Contradiction:

Improveoutput power linearityVSAvoidfrequency bandwidth

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The patent modifies the frequency response parameters by adding inductive elements that create resonant peaks and extend the -3dB bandwidth. The LC combination changes the circuit's electrical parameters to achieve broader frequency coverage while maintaining linearity through impedance matching across the extended bandwidth.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The composite LC matching circuit combines capacitive and inductive properties to achieve both linearity and broad bandwidth. The capacitive elements provide linearity control while inductive elements extend the frequency response, creating a versatile circuit that maintains performance across a wider frequency range.

Inventive Principle:

Principle #40Composite materials

3Power

If inductance matching circuit is added, then output power and frequency bandwidth are improved, but reactive power consumption increases

Engineering Contradiction:

Improveoutput powerVSAvoidreactive power consumption

Core Design Contradiction:

PowerVSUse of energy by moving object

Solution Approach 1:

The patent applies the counterweight principle by pairing capacitive reactance with inductive reactance in the matching circuit. The inductive elements counterbalance the capacitive reactance, canceling out reactive power consumption through resonant cancellation. This allows the circuit to achieve high output power while minimizing net reactive power usage through the opposing effects of LC components.

Inventive Principle:

Principle #8Anti-weight (Counterweight)

4Adaptability or versatility

If inductance matching circuit is added, then frequency bandwidth is improved, but reactive power consumption increases

Engineering Contradiction:

Improvefrequency bandwidthVSAvoidreactive power consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The patent uses counterbalancing reactance where inductive elements offset capacitive reactance across the frequency spectrum. This counterweight mechanism extends frequency bandwidth while canceling reactive power consumption through resonant frequency matching, allowing broad adaptability without proportional increases in reactive power usage.

Inventive Principle:

Principle #8Anti-weight (Counterweight)

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

The solution increases output power and linearity while expanding the frequency bandwidth, allowing for more efficient signal transmission across a broader range with reduced circuit area requirements.

Implementation Method 1

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS20250015766A1Programmable power amplifier

Publication Date: 2025.01.09 APPLE INC

AI summary

This disclosure is directed to a programmable power amplifier including an output impedance matching circuit, and a programmable inductance matching circuit. The inductance matching circuit may be coupled to the impedance matching circuit. The inductance matching circuit may include one or more shunt inductors to reduce an adverse effect of one or more capacitors of the programmable power amplifier. The inductance matching circuit may improve an output power of the power amplifier, adjust a center frequency (e.g., resonant frequency) for providing output signals by the power amplifier, or both. As such, an electronic device may include one or more power amplifiers having the inductance matching circuit to amplify input signals with improved output power, improve a bandwidth for providing the output signals based on adjusting the center frequency, or both.