Adaptive Baseline Correction for ASK Demodulation
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Solution Overview
Problem
Incorporating data transmission capabilities into wireless power transceivers, such as those in smartphones, is challenging due to space constraints and the high cost of digital memory and filters required for demodulating amplitude shift keying (ASK) signals, which are typically used for data reception.
Innovation Solution
A wireless power transceiver design that includes a transceiver coil, a controlled switching bridge circuit, an analog voltage differential sensing circuit, an analog-to-digital converter, a compensation circuit, an accumulator, and a filter, which together enable efficient demodulation of ASK signals by sensing voltage differences and compensating for baseline drift, thereby reducing space and cost requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If typical hardware for demodulating data received via ASK is used, then data transmission capability is achieved, but device space consumption increases
Solution Approach 1:
The patent extracts and eliminates the need for complex digital memory and digital filter components from the ASK demodulation system. By using an analog front-end approach with a simple low-pass filter and threshold detector, the design removes bulky digital processing hardware while maintaining data transmission capability, thereby reducing device space consumption.
Solution Approach 2:
The patent replaces complex digital signal processing systems with analog signal processing techniques. The ASK demodulation is achieved through analog circuitry including an analog multiplier, low-pass filter, and threshold detector, eliminating the need for digital memories and digital filters that would consume significant space in mobile devices.
2Adaptability or versatility
If typical hardware for demodulating data received via ASK is used, then data transmission capability is achieved, but manufacturing cost increases
Solution Approach 1:
The patent employs simple, low-cost analog components instead of expensive digital memory and filter hardware. The demodulation system uses readily available analog circuit elements such as resistors, capacitors, operational amplifiers, and simple filters, which are significantly cheaper to manufacture and integrate than digital processing components, thereby reducing overall manufacturing cost.
Solution Approach 2:
The patent removes expensive digital memory and digital filter components from the ASK demodulation system. By using an analog front-end approach with minimal processing requirements, the design eliminates high-cost components while maintaining functional capability, thus reducing manufacturing cost.
3Productivity
If digital memories and digital filters are used for ASK demodulation, then data processing capability is improved, but device cost increases
Solution Approach 1:
The patent replaces digital signal processing systems with analog signal processing techniques. The ASK demodulation is achieved through analog circuitry including an analog multiplier, low-pass filter, and threshold detector, eliminating the need for digital memories and digital filters that would increase device cost while maintaining adequate data processing capability for wireless power transmission control.
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
The solution allows for effective demodulation of ASK signals within limited space and cost constraints, maintaining accurate data transmission while minimizing the risk of overflow due to baseline drift, thus enhancing the functionality of wireless power transceivers.
Implementation Method 1
a transmitter formed by a transmission coil driven by time varying electric power from a power source to form a time-varying electric field
Implementation Method 2
a receiver formed by a receiver coil in which the time-varying electric field induces an AC current
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
A data demodulating circuit includes a sensing circuit sensing a power signal applied to a coil at first and second times, and outputting an analog value representing a difference in voltage of the power signal at the first and second times. An analog-to-digital converter digitizes the analog value output by the analog voltage differential sensing circuit to produce a digital code. A compensation circuit, over a period of time, compares a present value of the digital code to a first value of the digital code during the period, and subtracts a given value from the present value of the digital code if the present value is greater than the first value but add the given value to the present value of the digital code if the present value is less than the first value. An accumulator accumulates output of the compensation circuit, and a filter filters output of the accumulator.