On-Chip Transmission Power Estimation Without Passive Components
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Solution Overview
Problem
Traditional methods for monitoring transmission power in wireless devices are complex, costly, and can affect the device's operation due to the need for additional passive components and calibration, which introduces resistance offsets and power overhead.
Innovation Solution
Incorporating a wireless integrated circuit with on-chip transmitter power control that uses techniques such as root mean square, mean of absolute, and digital methods to estimate and manage transmission power without external components, thereby reducing complexity and preserving signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional passive components are used to monitor transmission power, then power monitoring capability is achieved, but power overhead increases and device operation is affected
Solution Approach 1:
The patent combines the power monitoring function with the existing power amplifier output stage by sampling the output signal through a coupling capacitor and resistor network that is already part of the amplifier circuit. This integration eliminates the need for separate passive monitoring components, thereby achieving power monitoring capability without additional power overhead.
Solution Approach 2:
The patent creates a scaled-down copy of the power amplifier output signal through a resistive divider network. This copy signal is sufficient for power monitoring purposes and can be processed by the control circuit without requiring the full power amplifier output, thus avoiding excessive power consumption in the monitoring path.
2Measurement precision
If traditional passive components and calibration methods are used, then power monitoring is achieved, but device complexity and cost increase
Solution Approach 1:
The patent implements a self-calibrating system where the control circuit automatically adjusts the monitoring parameters based on feedback from the power amplifier output. The system uses the existing impedance characteristics of the power amplifier and automatically compensates for variations, eliminating the need for external calibration equipment and procedures.
Solution Approach 2:
The patent designs the monitoring circuit to serve multiple functions: it monitors transmission power, provides feedback for power control, and characterizes the power amplifier output impedance simultaneously. This multi-functionality is achieved through a unified circuit architecture that processes the power amplifier output signal for multiple purposes, reducing overall device complexity.
3Measurement precision
If bond wire calibration is performed, then power monitoring accuracy is improved, but resistance offsets are introduced due to current variation
Solution Approach 1:
The patent implements a feedback mechanism where the control circuit continuously monitors the power amplifier output and adjusts the monitoring parameters in real-time. This feedback loop compensates for resistance variations in bond wires and other components by dynamically adapting the measurement parameters, thereby maintaining accuracy without introducing fixed resistance offsets.
Solution Approach 2:
The patent changes the monitoring parameters dynamically based on the operating conditions of the power amplifier. Instead of using fixed calibration values, the system adjusts resistance ratios, sampling frequencies, and gain parameters according to the actual current and power levels, thereby compensating for resistance offsets that vary with current.
Data Source
AI summary
Embodiments of power estimation of a transmission are presented herein.