Variable Matching Circuit for Multi-Band Transmission Module

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Solution Overview

Problem

Existing multi-band transmission modules require a large number of elements and a significant area to support multiple frequency bands, making them unsuitable for compact mobile communication devices.

Innovation Solution

A transmission module that includes an amplifier, a power supply voltage regulator circuit, and a variable matching circuit with at least one variable capacitor element, which adjusts capacitance values to match output impedance for different frequency bands based on changes in power supply voltages, eliminating the need for separate elements for each frequency band.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If combinations of output impedance matching circuits and power amplifiers optimized for predetermined frequency bands are provided in parallel for individual frequency bands, then multi-band system support is achieved, but the number of elements and module area increase significantly

Engineering Contradiction:

Improvemulti-band system supportVSAvoidnumber of elements

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent employs a single power amplifier that can operate across multiple frequency bands by dynamically adjusting its power supply voltage and output impedance matching conditions. This universal approach eliminates the need for multiple dedicated amplifiers for different frequency bands, thereby reducing the number of elements while maintaining multi-band support capability

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The invention uses dynamic control of power supply voltage and variable impedance matching circuits to adapt the single power amplifier's characteristics to different frequency bands in real-time. This dynamic adjustment allows the amplifier to optimize its performance for each frequency band without requiring separate static circuits for each band

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

Engineering Contradiction:

Improvemulti-band system supportVSAvoidmodule area

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The patent merges the functions of multiple frequency-band-specific power amplifiers and impedance matching circuits into a single integrated power amplifier with dynamically controllable characteristics. This consolidation significantly reduces the module area by eliminating redundant components while maintaining the ability to support multiple frequency bands through voltage and impedance control

Inventive Principle:

Principle #5Merging (Combining)

3Device complexity

If a single amplifier is used to amplify multiple frequency bands, then the number of elements is reduced, but different power supply voltages are required for different frequency bands

Engineering Contradiction:

Improvenumber of elementsVSAvoidpower supply voltage requirements

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The invention utilizes parameter changes in the power supply voltage to control the power amplifier's operating characteristics across different frequency bands. By dynamically adjusting the power supply voltage, the amplifier's gain, bandwidth, and output power are optimized for each frequency band, enabling multi-band operation with a single amplifier without requiring additional voltage generation circuits

Inventive Principle:

Principle #35Parameter changes

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 configuration allows the transmission module to support multiple frequency bands without increasing the number of elements, reducing the module's size and simplifying the circuit configuration while maintaining optimal performance.

Implementation Method 1

a variable matching circuit including at least one variable capacitor element. The variable matching circuit includes no variable inductor element. The variable matching circuit satisfies different output impedance matching conditions of the amplifier for the respective frequency bands of the transmission signals by changing a capacitance value of the at least one variable capacitor element on the basis of a change in the output impedance matching conditions of the amplifier in response to a change in the power supply voltages supplied to the amplifier

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS10090868B2Transmission module and transmission and reception module

Publication Date: 2018.10.02 MURATA MFG CO LTD

AI summary

A transmission module includes an amplifier that amplifies a plurality of transmission signals in different frequency bands, a power supply voltage regulator circuit that supplies different power supply voltages for the respective frequency bands of the transmission signals to the amplifier, and a variable matching circuit including at least one variable capacitor element and at least one fixed inductor element. The variable matching circuit satisfies different output impedance matching conditions of the amplifier for the respective frequency bands of the transmission signals by changing a capacitance value of the at least one variable capacitor element on the basis of a change in the output impedance matching conditions of the amplifier in response to a change in the power supply voltages supplied to the amplifier.