Amplifier Bias Current Correction for Uniform Power Consumption
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Solution Overview
Problem
Existing amplifiers with bias and amplification circuits face challenges in reducing variation in current consumption due to manufacturing variations in semiconductor elements, which affects power consumption uniformity in communication devices.
Innovation Solution
Incorporating a correction circuit that adjusts the bias current setting based on measured actual bias current, using a digital control circuit, a memory for storing correction information, and a bias circuit to determine the bias current, thereby reducing current consumption variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manufacturing variation of semiconductor elements is present, then device production is feasible, but variation in current consumption of amplification circuit increases
Solution Approach 1:
The patent measures the actual bias current during the manufacturing process and stores correction information before the device is shipped. This preliminary measurement and correction data storage allows the system to compensate for manufacturing variations later, achieving uniform current consumption without requiring extremely tight manufacturing tolerances.
Solution Approach 2:
The patent implements a feedback mechanism where the measured actual bias current is used to generate correction information that adjusts the control signal. This closed-loop feedback allows the system to automatically compensate for manufacturing variations in semiconductor elements, reducing current consumption variation without increasing manufacturing complexity.
2Manufacturing precision
If correction circuit is added to reduce current consumption variation, then power consumption uniformity improves, but device complexity increases
Solution Approach 1:
The patent introduces a correction circuit that acts as an intermediary between the control signal source and the amplification circuit. This correction circuit receives the control signal, applies correction based on stored correction information, and outputs the adjusted control signal. The intermediary approach allows uniform current consumption to be achieved through software/firmware correction rather than complex hardware redesign.
Solution Approach 2:
The patent changes the control parameter (control signal for bias current) based on correction information derived from actual measurements. By adjusting the control signal parameter rather than redesigning the physical circuit structure, the system achieves uniform current consumption with minimal increase in device complexity.
3Reliability
If bias current is increased to ensure sufficient amplification, then amplification performance improves, but power consumption increases
Solution Approach 1:
The patent implements dynamic adjustment of the bias current control signal based on actual measurements and correction information. Instead of using a fixed conservative bias current setting, the system dynamically optimizes the control signal to achieve the minimum necessary current for sufficient amplification, reducing power consumption while maintaining reliability.
Solution Approach 2:
The patent optimizes the bias current parameter by applying correction information to the control signal. This allows the system to use the precise minimum current required for sufficient amplification rather than excessive current, achieving a balance between amplification performance and power consumption through parameter optimization.
Data Source
AI summary
An amplifier includes at least one amplification circuit through one of which a bias current flows, a first memory that stores control information to specify the bias current to be fed through the one of the at least one amplification circuit, a digital control circuit that generates a bias current setting to set the bias current in accordance with the control information, a second memory that stores correction information to correct the bias current setting, a correction circuit that corrects the bias current setting in accordance with the correction information, and a bias circuit that determines the bias current in the one of the at least one amplification circuit in accordance with the bias current setting, which has been corrected.