Dual-Bias Power Amplifier Circuit 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 freely adjust the amplifier's 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 the output characteristic 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 freely 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 bias currents can be varied. By introducing control circuits that can adjust the bias current ratios dynamically, the amplifier's output characteristic becomes adjustable according to different operating conditions, resolving the contradiction between simplicity and adaptability.

Inventive Principle:

Principle #15Dynamics

2Reliability

If bias current is increased to improve output characteristic, then amplifier performance improves, but current consumption increases

Engineering Contradiction:

Improveamplifier performanceVSAvoidcurrent consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

Instead of using a single high bias current, the invention changes the parameter approach by using multiple bias circuits with different current levels. The amplifier performance is maintained or improved by optimizing the ratio of bias currents from different circuits, allowing flexible adjustment between performance and power consumption based on operating conditions.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention applies partial action by using multiple bias circuits where not all need to operate at maximum capacity simultaneously. By adjusting the ratio of bias currents, the system can achieve the required amplifier performance with optimized total current consumption, avoiding the excessive current consumption that would result from simply increasing a single bias current.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS10819286B2Power amplification circuit

Publication Date: 2020.10.27 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.