Dynamic Receiver Configuration for NFC Antenna Detuning

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Solution Overview

Problem

NFC and RFID communication systems face challenges in maintaining stable communication performance across various counterparts with different antennas and modulation concepts, requiring large dynamic range in receiver units, which increases circuit complexity, power consumption, and device size.

Innovation Solution

A communication device with a receiver, transmitter, and sensors that dynamically configure receiver settings based on measured antenna detuning and load, using parameter-value pairs stored in memory to alter processing behavior and select optimal receiver configurations, thereby adjusting filter cutoff frequencies, amplifier gains, and other control parameters.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If receiver units are designed to offer a large dynamic range to handle various counterparts with different antennas and modulation concepts, then communication performance stability is improved, but circuit complexity increases

Engineering Contradiction:
Improvecommunication performance stabilityVSAvoidcircuit complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements dynamic receiver configuration where the control unit selects from multiple pre-stored receiver configurations based on detected load conditions. Instead of designing a complex receiver that can handle all possible signal strengths simultaneously, the system dynamically switches between different pre-optimized configurations (each with different gain settings, filter parameters, etc.) to match the actual communication conditions. This resolves the contradiction by achieving adaptability through time-multiplexed configuration switching rather than simultaneous multi-mode circuit design.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent changes receiver operating parameters (gain, filter cutoff frequencies, bandwidth) based on detected load conditions and antenna detuning. By storing multiple configurations with different parameter sets and selecting the appropriate one based on real-time conditions, the system achieves large dynamic range handling capability without requiring a single complex circuit design. Each configuration is optimized for specific conditions, and the control unit switches between them based on sensor feedback.

Inventive Principle:
Principle #35Parameter changes

2Reliability

If receiver units are designed to offer a large dynamic range to handle various counterparts with different antennas and modulation concepts, then communication performance stability is improved, but power consumption increases

Engineering Contradiction:
Improvecommunication performance stabilityVSAvoidpower consumption
Core Design Contradiction:
ReliabilityVSUse of energy by moving object

Solution Approach 1:

The system dynamically activates only the receiver configuration needed for current conditions rather than maintaining all configuration capabilities simultaneously. By switching between pre-stored configurations based on detected load and detuning conditions, the system achieves adaptive performance optimization while minimizing power consumption by keeping the receiver in the most energy-efficient appropriate state for each situation.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent adjusts receiver parameters (gain, bandwidth, filtering) based on actual communication conditions. By using lower gain and narrower bandwidth when signal conditions permit, the system reduces power consumption while maintaining communication stability. The pre-stored configurations contain parameter sets optimized for different signal strengths, allowing the receiver to operate efficiently across a wide dynamic range without continuously consuming maximum power.

Inventive Principle:
Principle #35Parameter changes

3Reliability

If receiver units are designed to offer a large dynamic range to handle various counterparts with different antennas and modulation concepts, then communication performance stability is improved, but device size increases

Engineering Contradiction:
Improvecommunication performance stabilityVSAvoiddevice size
Core Design Contradiction:
ReliabilityVSVolume of moving object

Solution Approach 1:

The patent uses a single receiver hardware unit that dynamically reconfigures its parameters through software/control logic rather than providing separate physical receiver circuits for different signal conditions. The control unit selects from multiple pre-stored configurations, allowing one physical device to perform the function of multiple specialized receivers would provide. This achieves large dynamic range handling in a compact form factor.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The receiver unit is designed as a universal platform capable of handling various communication conditions through parameter reconfiguration. By storing multiple configurations and selecting based on detected conditions, a single receiver circuit performs the work of what would traditionally require multiple specialized receivers. This multi-functionality approach maintains communication stability across different scenarios while minimizing device size.

Inventive Principle:
Principle #6Universality (Multi-functionality)

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

This approach enhances receiver sensitivity and stability by optimizing receiver configurations based on environmental and operational conditions, improving communication performance across different modulation strengths and antenna types without increasing device complexity or power consumption.

Implementation Method 1

a sensor to measure antenna detuning... The sensor or the control unit is configured to measure an amount of detuning based on a change in the monitored voltage or current

Methodology Applied
Scientific EffectAntenna detuning: Resonance

Implementation Method 2

The primary device (typically called 'reader') generates a magnetic RF field. The counterpart (which can be for example a mobile phone, a tag or a transponder) can be supplied with power via this RF field

Methodology Applied
Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 3

This can be for example switching a resistor parallel to the counterpart's antenna (quality factor modulation)

Methodology Applied
Scientific EffectQuality factor modulation: Resonance

Data Source

PatentUS9755679B1Load dependent receiver configuration
Publication Date: 2017.09.05 NXP BV
  • US9755679B1 patent drawing
  • US9755679B1 patent drawing
  • US9755679B1 patent drawing

AI summary

A communication device is disclosed. The communication device includes a receiver, a transmitter, a memory, a sensor to measure antenna detuning, a plurality of receiver configurations stored in the memory. Each of the plurality of receiver configurations include parameter-value pairs and a control unit, coupled to the sensor and the receiver, to select a receiver configuration from the plurality of receiver configurations based on an output of the sensor. The control unit is configured to alter a processing behavior of the receiver by altering values of receiver control parameters according to the parameter-value pairs.