Dual-Bias Power Amplifier for Adjustable Output Characteristics

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Solution Overview

Problem

Existing power amplification circuits in mobile communication devices have fixed output characteristics due to fixed bias circuit characteristics, limiting the ability to adjust amplifier output characteristics.

Innovation Solution

A power amplification circuit with dual bias circuits and control circuits that allow for adjustable bias currents or voltages, enabling the adjustment of output characteristics by varying the ratio of bias currents supplied to the amplifier.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a fixed bias circuit is used, then the circuit structure is simple, but the output characteristic of the amplifier cannot be adjusted

Engineering Contradiction:

Improveadjustability of output characteristicVSAvoidbias circuit structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The bias circuit is divided into multiple independent bias circuits (first bias circuit, second bias circuit, etc.), each capable of supplying bias current independently. This segmentation allows the output characteristic to be adjusted by controlling the ratio of bias currents from different circuits, while keeping each individual bias circuit relatively simple in structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The bias circuit transitions from a fixed configuration to a dynamic one where the bias current can be adjusted. By introducing control circuits that can vary the bias current ratio dynamically, the amplifier's output characteristic becomes adjustable according to different operating conditions, achieving adaptability without excessive complexity.

Inventive Principle:

Principle #15Dynamics

2Power

If the bias current is increased to improve output power, then the power amplification capability is enhanced, but the current consumption increases

Engineering Contradiction:

Improveoutput powerVSAvoidcurrent consumption

Core Design Contradiction:

PowerVSUse of energy by moving object

Solution Approach 1:

The invention changes the parameter of bias current from a fixed value to a variable ratio. By controlling the ratio of bias currents from multiple bias circuits, the system can optimize the balance between output power and current consumption. The control circuits adjust the bias current distribution to achieve maximum power amplification efficiency at different operating points.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11264952B2Power amplification circuit

Publication Date: 2022.03.01 MURATA MFG CO LTD

AI summary

Provided is a power amplification circuit that includes: an amplifier that amplifies an input signal and outputs an amplified signal; a first bias circuit that supplies a first bias current or voltage to the amplifier; a second bias circuit that supplies a second bias current or voltage to the amplifier; a first control circuit that controls the first bias current or voltage; and a second control circuit that controls the second bias current or voltage. The current supplying capacity of the first bias circuit is different from the current supplying capacity of the second bias circuit.