On-Chip Power Detector Calibration for Linear Transmit Power
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Solution Overview
Problem
Power detectors in integrated circuits often have non-ideal characteristics due to manufacturing variations, leading to inaccurate measurements and incorrect gain adjustments in transmitters and receivers, which can result in inefficiencies and reduced maximum linear power in phased-array systems.
Innovation Solution
On-chip calibration of power detectors by generating gain and phase offsets using calibration data from non-volatile memory and command data from static memory, allowing for precise adjustment of output signals to achieve accurate power and phase measurements, thereby correcting for manufacturing variations and improving system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power detectors are used without calibration, then device complexity is reduced, but measurement precision deteriorates due to manufacturing variations
Solution Approach 1:
The patent applies preliminary action by performing calibration during the manufacturing process and storing correction values in non-volatile memory before the device is deployed. The calibration data is pre-computed and stored, eliminating the need for complex real-time calibration systems during operation. This resolves the contradiction by achieving high measurement precision through advance preparation rather than complex operational systems.
Solution Approach 2:
The power detector system performs self-calibration by automatically applying correction values from stored calibration data to compensate for its own manufacturing variations. The system uses its internal resources (non-volatile memory, digital signal processor) to correct its measurement errors without requiring external calibration equipment during operation, thus improving measurement precision without adding external system complexity.
2Measurement precision
If on-chip calibration is implemented, then measurement precision is improved, but device complexity increases due to additional memory and processing components
Solution Approach 1:
The patent merges the calibration functionality into the existing integrated circuit by incorporating non-volatile memory and digital signal processing capabilities within the same chip. The calibration data is stored on-chip in non-volatile memory, and the digital signal processor applies corrections internally. This integration improves measurement precision while minimizing the increase in device complexity by combining multiple functions into a single integrated system rather than using separate external components.
Solution Approach 2:
The integrated circuit is designed with multi-functionality, where the same digital signal processor and memory structures serve both calibration operations and normal signal processing tasks. The non-volatile memory stores both calibration data and operational data, and the digital signal processor handles both correction calculations and regular signal modulation/demodulation. This universal design improves measurement precision without proportionally increasing device complexity by reusing existing hardware resources for multiple purposes.
3Measurement precision
If calibration data is stored in non-volatile memory, then measurement precision is improved, but manufacturing complexity increases
Solution Approach 1:
The calibration data is pre-computed and stored in non-volatile memory during the manufacturing process before the device is shipped. This preliminary action allows the calibration to be performed once during production using standard equipment, and the results are permanently stored. This approach improves measurement precision while keeping manufacturing complexity manageable by performing calibration as a one-time preliminary step rather than requiring complex ongoing calibration infrastructure.
Solution Approach 2:
The patent uses non-volatile memory (such as EEPROM or flash memory) that can be programmed relatively inexpensively during manufacturing. The calibration data is written to this memory once during production, and the memory serves as a disposable calibration medium that does not require complex reprogramming or adjustment mechanisms. This approach achieves high measurement precision while maintaining ease of manufacture by using cost-effective, programmable memory devices.
Data Source
AI summary
A system and a method for calibrating an output signal of an antenna is disclosed. In one aspect, an apparatus includes a first digital adder configured to generate a gain offset by at least adding gain calibration data from non-volatile memory and gain command data from static memory. The apparatus further includes an amplitude gain circuit configured to modify, based at least in part on the gain offset, an amplitude of a first output signal of a first antenna. The modified amplitude of the first output signal is provided to enable pre-calibration of the first output signal. The apparatus further includes a power detector configured to measure an output power of the first output signal. The apparatus further includes at least one processor configured to generate a difference between the measured and expected output power, and adjust gain command data in response to the generated difference.