Regulator Circuit Suppressing Spurious Waves in Power Amplifiers
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Solution Overview
Problem
High-power wireless systems face spurious wave issues due to rapid output voltage rise in power amplifiers, leading to increased circuit complexity and costs when using closed-loop APC systems.
Innovation Solution
A semiconductor device with a regulator for power amplifiers that controls the rise rate of output voltage by limiting inrush current and gradually increasing loop gain, reducing spurious waves without the need for additional circuit components like wave detectors or integrators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If closed-loop APC system is introduced to address spurious waves, then spurious wave suppression is improved, but circuit complexity and cost increase due to additional wave detector, integrator, or the like
Solution Approach 1:
The patent extracts and eliminates unnecessary circuit components from the traditional closed-loop APC system. By removing the wave detector and integrator, the invention achieves spurious wave suppression through a simplified regulator circuit that directly controls the power amplifier's supply voltage, thereby reducing circuit complexity while maintaining effectiveness.
Solution Approach 2:
The regulator circuit performs self-control by automatically adjusting the power supply voltage to the power amplifier based on its own output characteristics. This self-service mechanism eliminates the need for external wave detection and integration circuits, as the regulator inherently manages the spurious wave issue through its control logic.
2Object-affected harmful factors
If closed-loop APC system is introduced to address spurious waves, then spurious wave suppression is improved, but power consumption increases due to increased circuit scale
Solution Approach 1:
The patent removes power-consuming components such as the wave detector and integrator from the system. The simplified regulator circuit consumes less power while achieving the same spurious wave suppression function, directly addressing the power consumption issue.
Solution Approach 2:
The self-controlling regulator reduces power consumption by eliminating the need for continuous wave detection and integration operations. The regulator only consumes power when actively adjusting the power amplifier's supply voltage, rather than continuously operating additional circuitry.
3Productivity
If output voltage rises rapidly in power amplifier, then transmission power control is improved, but spurious waves increase in near band of transmitted signal frequency
Solution Approach 1:
The regulator dynamically adjusts the power supply voltage to the power amplifier, controlling the rise rate of the output voltage. By making the voltage increase gradual rather than abrupt, the system maintains effective transmission power control while suppressing spurious wave generation in the near band frequencies.
Data Source
AI summary
Use of a closed loop APC may involve a problem of cost and power consumption due to increased circuit scale.The semiconductor device includes a power amplifier that amplifies an output from a transmission circuit and a regulator that supplies power to the power amplifier. The regulator includes an operational amplifier comprising a loop gain control circuit and a loop gain control voltage generation circuit that supplies control voltage to the loop gain control circuit. The loop gain control voltage generation circuit minimizes a loop gain of the operational amplifier when starting up the regulator.