Power Detector Calibration Module for Low Voltage Stability
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Solution Overview
Problem
Conventional power detectors face challenges in minimizing errors caused by process variations and temperature variations, especially at low supply voltages, which limit their ability to maintain a wide input dynamic range and operate effectively at high frequencies.
Innovation Solution
A power detector design that includes a PD module with parallel stages, a filter generating a driving signal for a specific band, and a calibration module that feeds back a calibrated signal to the PD module to minimize errors, allowing for calibration of process and temperature variations, thereby maintaining a constant output value across varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional power detector structure is used, then the device can operate at low supply voltage, but the output value varies sensitively according to process variation and temperature variation
Solution Approach 1:
The patent introduces a feedback mechanism where the power detector output is fed back through a calibration module that adjusts the input to the PD module. This feedback loop compensates for process and temperature variations by dynamically adjusting the operating point, thereby stabilizing the output value while maintaining low supply voltage operation.
Solution Approach 2:
The patent changes the operating parameters of the power detector by introducing a calibration signal that modifies the input voltage to the PD module. This parameter adjustment compensates for variations in process and temperature, allowing the detector to maintain stable output performance across different operating conditions.
2Use of energy by moving object
If the supply voltage is reduced to low levels, then energy consumption is reduced, but the input dynamic range becomes limited
Solution Approach 1:
The patent makes the power detector dynamic by introducing a calibration module that can adjust the input voltage to the PD module in real-time. This dynamic adjustment allows the detector to adapt its input dynamic range according to the operating conditions, enabling it to maintain a wide input dynamic range even at low supply voltages by optimally positioning the operating point.
3Reliability
If a peak detector structure is used, then insensitivity to process and temperature variation is achieved, but the input dynamic range is limited at low supply voltage
Solution Approach 1:
The patent segments the power detector into multiple functional stages: a PD module for voltage-to-current conversion, a filter for frequency selection, and a calibration module for compensation. This segmentation allows each stage to be optimized independently, enabling the overall system to achieve both insensitivity to variations and wide input dynamic range at low supply voltage.
4Adaptability or versatility
If an RMS detector structure is used, then wide input dynamic range is achieved, but sensitivity to GM variation and temperature variation increases
Solution Approach 1:
The patent employs feedback by routing the power detector output through a calibration module that adjusts the input to compensate for GM and temperature variations. This feedback mechanism allows the system to maintain wide input dynamic range while reducing sensitivity to parameter variations through dynamic compensation.
Data Source
AI summary
Disclosed is a power detector. The power detector in which calibration is performed to minimize errors caused by a process variation and a temperature variation in a structure that allows a wide input dynamic range of the power detector at a low supply voltage is provided.