ASK Receiver Demodulation Without an Envelope Detector
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Solution Overview
Problem
Conventional forward data receiving devices consume significant power and occupy large chip areas due to the inclusion of an envelope detector and analog comparator in their design.
Innovation Solution
A forward data receiving device utilizing digital circuits to demodulate Amplitude Shift Keying (ASK) modulation signals without an envelope detector, employing a resonance regulating rectifier module and a demodulation module based on digital logic circuits to control and rectify input voltage using Pulse Width Modulation (PWM) and generate gate signals for output transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an envelope detector and analog comparator are used in the forward data receiving device, then demodulation function is achieved, but power consumption increases and chip area increases
Solution Approach 1:
The patent extracts and removes the envelope detector from the traditional ASK demodulation circuit, keeping only the essential analog comparator. This extraction principle directly reduces power consumption and chip area while maintaining the core demodulation function through the remaining comparator circuit that can still detect amplitude variations in the received signal
Solution Approach 2:
The patent changes the operating parameters of the analog comparator by optimizing its reference voltage and threshold levels to enable reliable demodulation with minimal circuit components. By adjusting these parameters, the system achieves accurate amplitude detection without requiring the full envelope detector circuitry, thus reducing power consumption while maintaining demodulation reliability
2Reliability
If an envelope detector and analog comparator are used in the forward data receiving device, then demodulation function is achieved, but chip area increases
Solution Approach 1:
The patent extracts and removes the envelope detector from the traditional ASK demodulation circuit, keeping only the essential analog comparator. This extraction principle directly reduces power consumption and chip area while maintaining the core demodulation function through the remaining comparator circuit that can still detect amplitude variations in the received signal
Solution Approach 2:
The patent makes the analog comparator perform multiple functions: it serves as both the core comparison element for demodulation and as the amplitude detection mechanism itself. By making the comparator multi-functional, the system eliminates the need for separate envelope detector circuitry, thereby reducing chip area while maintaining full demodulation capability
3Reliability
If resonance regulating rectifier with PWM is used, then voltage regulation is achieved, but circuit complexity increases
Solution Approach 1:
The patent merges the voltage regulation function with the existing rectifier circuit by implementing PWM control directly within the rectifier stage. This combining of functions allows the circuit to achieve stable voltage regulation without adding separate, complex regulation stages, thus maintaining relatively simple circuit architecture while ensuring reliable voltage output for the demodulation circuit
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 reduces power consumption and chip size by eliminating the envelope detector, achieving efficient demodulation while maintaining effective signal processing.
Implementation Method 1
The AC-DC rectifier converts AC voltage into DC voltage
Implementation Method 2
PWM technology reduces the width of gate voltage when the target voltage is low, and increases the width of gate voltage when the target voltage is high
Implementation Method 3
Such a wireless power transfer system may transmit and receive power through change in the magnetic field of coils at both ends of transmitting and receiving sides
Implementation Method 4
Since the output voltage VENV is generated by an RC-based envelope detector, decrease of the output voltage VENV varies according to the input data value and the data rate
Data Source
AI summary
An embodiment includes a forward data receiving device that demodulates and receives an Amplitude Shift Keying (ASK) modulation signal, and includes: an input module configured to receive the ASK modulation signal as an input; a resonance regulating rectifier module configured to regulate and rectify an input voltage of the ASK modulation signal on the basis of Pulse Width Modulation (PWM) according to a preset target voltage, and apply a regulated voltage through an output transistor; and a demodulation module configured to demodulate the ASK modulation signal according to a trend in a change of the input voltage compared to the regulated voltage, wherein the resonance regulating rectifier module includes a comparison unit configured to generate a gate signal for controlling on/off of the output transistor, and generate a sample signal for demodulating the ASK modulation signal.