mmWave Phased Array Power Amplifier Input Control Using ADC Averaging
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Solution Overview
Problem
Existing methods for determining power amplifier input power in phased array antenna systems are inaccurate and time-consuming, leading to variations in input power measurements, which can degrade the longevity and reliability of power amplifiers.
Innovation Solution
A system and method for power amplifier input control that uses an analog-to-digital converter to simultaneously measure and average input signal strengths across multiple power amplifiers, determining voltage headroom and estimating power backoff values to maintain each amplifier within an acceptable operating range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional methods are used to determine power amplifier input power, then measurement process is simpler, but measurement precision is poor and variations in input power measurements occur
Solution Approach 1:
The patent segments the measurement process by using separate input power detectors for each power amplifier in the phased array system. Each detector independently measures the input power to its associated amplifier, allowing for precise individual measurements without cross-interference. This segmentation enables accurate tracking of each amplifier's input power level while maintaining system manageability through modular detector units.
2Productivity
If sequential measurement methods are used, then device complexity is reduced, but productivity is low due to time-consuming measurements
Solution Approach 1:
The patent merges the measurement capabilities of multiple power amplifier detectors into a unified measurement architecture where all input power measurements are performed simultaneously within a single measurement interval. The system combines individual detector outputs to provide comprehensive power monitoring across the entire phased array system, achieving high-speed concurrent measurement without requiring complex sequential switching mechanisms.
3Reliability
If no input power control is implemented, then device complexity is lower, but reliability of power amplifiers deteriorates due to over-driving
Solution Approach 1:
The patent implements a feedback control mechanism where the measured input power values from each power amplifier detector are fed back to a controller. The controller compares the measured input power against predetermined thresholds and generates control signals to adjust the input power level when necessary. This feedback loop ensures that each power amplifier operates within its safe operating range, preventing over-driving and extending amplifier lifespan through continuous monitoring and automatic correction.
Data Source
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AI summary
A system for power amplifier control includes a processor, a memory in communication with the processor, wherein the processor and the memory are configured to simultaneously provide input signal strength of each of a plurality of power amplifiers in a millimeter wave (mmW) phased array system, determine an average input signal strength of the plurality of power amplifiers based on the provided input signal strengths using an analog-to-digital converter (ADC), determine a voltage headroom for the plurality of power amplifiers based on the determined average input signal strength, estimate a power backoff value based on the voltage headroom, and determine a gain control value based on the estimated power backoff value.