Digital Demodulation Circuit for High-Speed Wireless Data Recovery
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Solution Overview
Problem
Traditional load modulating/demodulating circuits are limited by high energy accumulation time, which restricts data transmission rate in wireless communication systems.
Innovation Solution
A digital demodulation circuit utilizing a wave-shaping voltage step-down circuit, analog amplifier, and digital demodulation components like D-type flip-flops and counters to process and recover data signals, allowing for rapid detection and demodulation of input signals by converting negative half-cycles to positive and reducing voltage amplitude, thereby enhancing data transmission speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional rectifier and filter based demodulation circuit is used, then circuit structure is simple, but data transmission rate is limited due to long energy accumulation time
Solution Approach 1:
The patent replaces the traditional mechanical/electrical energy accumulation method (rectifier-filter-integrator) with a digital signal processing approach. The demodulation circuit uses a counter to detect carrier cycles and a digital processor to determine data states, eliminating the need for continuous energy accumulation and enabling rapid data transmission within 1-2 carrier cycles.
Solution Approach 2:
The patent changes the fundamental parameter of demodulation from energy-based integration to time-based counting. By using a counter to track carrier cycles and comparing voltage levels at specific counting intervals, the system achieves fast demodulation without requiring prolonged energy accumulation, thus resolving the contradiction between transmission rate and accumulation time.
2Speed
If traditional envelope detector and integrator are used, then circuit implementation is straightforward, but demodulation speed is slow requiring long integration time
Solution Approach 1:
The patent substitutes the continuous time-domain integration process with discrete carrier cycle counting. The counter increments with each carrier cycle, and data determination is made at specific counting intervals, eliminating the need for long integration periods and achieving rapid demodulation within 1-2 carrier cycles.
Solution Approach 2:
The patent utilizes the periodic nature of carrier waves by counting discrete carrier cycles rather than continuous integration. The demodulation process synchronizes with the carrier period, making data determination occur at regular intervals (every N carrier cycles), which significantly reduces the required integration time and increases demodulation speed.
3Productivity
If wave-shaping voltage step-down circuit is used to process input signal, then data transmission speed is improved, but circuit complexity increases
Solution Approach 1:
The patent divides the demodulation function into distinct modular components: a wave-shaping voltage step-down circuit for signal conditioning, a counter for carrier cycle detection, a digital processor for data determination, and an output stage. This segmentation allows each module to perform its specific function efficiently while maintaining overall system manageability and complexity control.
Solution Approach 2:
The wave-shaping voltage step-down circuit acts as an intermediary between the input modulated signal and the digital processing stages. It performs essential signal conditioning (wave-shaping and voltage reduction) to make the signal suitable for digital detection, thereby enabling high-speed data transmission while isolating the complexity of signal conditioning from the digital processing logic.
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
Significantly improves data transmission speed and quantity by enabling rapid detection and demodulation of input signals within 1 or 2 carrier cycles, eliminating the need for envelope detectors and integrators, thus outperforming conventional demodulation methods.
Implementation Method 1
utilizing a wave-shaping voltage step-down circuit to perform a wave-shaping process for a modulating input signal; wave-shaping negative half-cycle signal changing to positive half-cycle signal of the modulating input signal
Implementation Method 2
wave-shaping voltage step-down circuit includes at least one amplifier, at least one diode and at least one capacitor
Implementation Method 3
data zero of the modulating input signal is filtered by an analog amplifier circuit
Implementation Method 4
utilizing a triggering circuit to start counting of span of data, until counting of data is completed; the triggering circuit includes a first D-type flip-flop
Implementation Method 5
counting of span of data is performed by a counter of data span; the counter of data span includes a first counter and a reset circuit
Data Source
AI summary
The present invention discloses a demodulating method for a demodulating circuit. The demodulating method comprises a step of utilizing a wave-shaping voltage step-down circuit to perform a wave-shaping process for a modulating input signal. A separate circuit of modulating input signal is filtering data zero of the modulating input signal and reserving data one of the modulating input signal. A triggering circuit of data recover is used to start the count of data span, until the data count is completed. A data recover circuit is used to recover the data.