Logarithmic Detector Demodulation for Low-Power EMI-Hardened Links
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Solution Overview
Problem
Current electronic communication systems face challenges in reducing power consumption while maintaining high-speed data transfer and minimizing electromagnetic interference (EMI), which limits their range and efficiency, especially in portable devices.
Innovation Solution
The use of regenerative selective logarithmic detector amplifiers (LDAs) with intrinsic frequency demodulation capability, which amplify signals from the noise floor over multiple cycles, reducing noise and EMI, and allowing for low-power, high-sensitivity communication through modulated signals in various formats, such as FM, PM, and AM, over hardwire transmission media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If processor frequency is increased to achieve faster data rates, then data transfer speed is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts processor frequency based on communication requirements, using higher frequencies only when high-speed data transfer is needed and lower frequencies for routine operations, thereby optimizing the balance between productivity and power consumption
Solution Approach 2:
The patent changes the operating parameters of the processor by varying frequency and voltage levels according to the specific communication task, enabling the system to achieve high data rates when necessary while consuming minimal power during normal operations
2Productivity
If complex modulation techniques are used to increase data rates, then productivity is improved, but signal-to-noise ratio requirements increase, limiting usable range
Solution Approach 1:
The system employs feedback mechanisms to monitor signal quality and dynamically adjust modulation complexity and transmission power, maintaining high data rates while adapting to varying signal-to-noise conditions to extend usable range
Solution Approach 2:
The modulation scheme dynamically transitions between different complexity levels based on channel conditions, using complex modulation when signal quality is high and simpler, more robust modulation when noise levels increase, thereby maintaining both productivity and reliability
3Reliability
If signal power is increased to overcome EMI and improve communication reliability, then reliability is improved, but power consumption increases
Solution Approach 1:
The system extracts and amplifies only the desired modulated signal from the noisy environment using selective filtering and signal processing techniques, rather than increasing overall signal power, thereby improving reliability without proportionally increasing power consumption
Solution Approach 2:
The patent introduces intermediate signal processing stages including selective amplification and filtering that enhance the desired signal while rejecting EMI, acting as intermediaries that improve reliability without requiring proportional increases in transmitted power
4Object-affected harmful factors
If additional circuitry is added to control signal edges and reduce EMI, then EMI is reduced, but device complexity and power consumption increase
Solution Approach 1:
The patent combines multiple EMI mitigation functions into integrated circuit blocks that perform signal conditioning, filtering, and edge control in a unified manner, reducing overall device complexity while maintaining effective EMI reduction
Solution Approach 2:
The system employs universal circuit blocks that perform multiple functions including EMI reduction, signal conditioning, and power management, thereby reducing the need for separate dedicated circuits and lowering overall device complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
LDAs enable low-power, noise-insensitive communication with improved signal-to-noise ratio and extended range by amplifying modulated signals without amplifying EMI, thus reducing power consumption and increasing the dynamic range of communication systems.
Implementation Method 1
logarithmic detector amplifiers (LDAs) with intrinsic frequency demodulation capability, which amplify signals from the noise floor over multiple cycles
Implementation Method 2
modulated signals in various formats, such as FM, PM, and AM
Implementation Method 3
transmits the modulated signal having a first carrier frequency, including the encoded information
Data Source
AI summary
A method is provided for communicating signals at a low power level in an electromagnetic interference (EMI) environment. A first device transmits a modulated signal having a first carrier frequency, including the encoded information via a hardwire transmission medium. In one aspect, the power level of the modulated signal can be adjusted to minimize power consumption or reduce the generation of EMI. The modulated signal may be in one of the following formats: frequency modulation (FM) or phase modulation (PM) to name a few examples. A second device including a logarithmic detector amplifier (LDA) demodulator circuit receives the signal, which may be mixed with EMI. The LDA demodulator circuit amplifies the modulated signal, without amplifying the EMI, to supply a demodulated baseband signal, which may be an n-ary digital signal, or an audio signal. A low-power, noise insensitive communication channel is also provided.