RF Amplifier Controller With Cascaded Calibration and Offset Current
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Solution Overview
Problem
Current RF amplifiers face challenges in meeting strict output power limits and efficiency requirements due to component variations and temperature changes, particularly in mass-produced devices like cellular phones, which necessitate calibration and compensation circuits to ensure compliance with specifications such as LTE-CA standards.
Innovation Solution
A circuital arrangement with calibration and control blocks arranged in a cascaded configuration, including an offset current generator, to provide calibrated output currents that control RF amplifier power, optimizing temperature compensation and reducing physical size and power consumption by selecting specific orderings of current multiplication circuit blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration and control blocks are arranged in cascaded configuration with offset current generator, then output power control precision is improved, but device complexity increases
Solution Approach 1:
The calibration and control system is divided into multiple independent blocks arranged in cascaded configuration, including first calibration block, second calibration block, and offset current generator. Each block performs a specific function (first calibration, second calibration, offset adjustment) and can be independently designed and optimized, allowing precise output power control while managing complexity through functional segmentation.
Solution Approach 2:
The system employs dynamic calibration where the calibration blocks and offset current generator can be selectively activated based on operating conditions. The offset current can be dynamically adjusted to compensate for temperature variations and component tolerances, enabling adaptive precision control without permanently increasing active complexity.
2Use of energy by moving object
If current multiplication circuit blocks are optimized in ordering, then power consumption and size are reduced, but manufacturing precision requirements increase
Solution Approach 1:
The system changes the ordering and configuration parameters of current multiplication circuit blocks to optimize power consumption and size. By carefully selecting which blocks are active and their arrangement, the patent achieves reduced power consumption while the calibration blocks compensate for any increased sensitivity to manufacturing variations through precise calibration adjustments.
3Measurement precision
If calibration blocks are used to meet strict output power limits, then output power control is improved, but device size increases
Solution Approach 1:
Multiple calibration functions are merged into a compact cascaded architecture where the first calibration block, second calibration block, and offset current generator share common circuit elements and control pathways. This integration achieves strict output power control while minimizing the overall device area compared to separate independent calibration circuits.
Data Source
AI summary
Various methods and circuital arrangements for controlling an RF amplifier while reducing size, cost and power consumption are presented. Included is an amplifier controller unit that provides different current amplification stages, via corresponding calibration and control blocks, that can be used for calibrating an output power of the RF amplifier based on a reference current. Order of the current amplification stages starting from the reference current allow reduction in size, cost and power consumption. A fixed or programmable offset current may be added to an output current provided by a current amplification stage.