ASK Receiving Circuit Using Exponent-Based Amplitude Demodulation
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Solution Overview
Problem
Existing receiving circuits for amplitude shift keying (ASK) signals face challenges in accurately demodulating signals due to phase and gain errors, and require complex multipliers and adders for correction, which complicates the process.
Innovation Solution
A receiving circuit with a first transmission element that divides in-phase and quadrature-phase signals into exponent and mantissa components, and an evaluation logic that uses these components to approximate the amplitude signal using logarithmic functions, simplifying the demodulation process by mirroring vectors in the I-Q plane and reducing computational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional receiving circuits are used for ASK signals, then phase and gain errors occur in demodulation, but measurement precision of amplitude is improved
Solution Approach 1:
The receiving circuit is divided into separate processing paths: a first receiving path for in-phase signals and a second receiving path for quadrature-phase signals. This segmentation allows independent processing of each signal component, enabling precise amplitude measurement while maintaining demodulation accuracy through separate error correction mechanisms for each path.
2Measurement precision
If vector calculations are performed for amplitude determination, then amplitude representation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex vector calculation mechanisms with an exponential operation-based amplitude determination system. Instead of performing traditional vector math operations, the circuit uses exponentiation of the in-phase and quadrature-phase signal magnitudes, which can be implemented more efficiently in hardware, thereby reducing device complexity while maintaining amplitude representation accuracy.
3Reliability
If correction functions with multiple multipliers and adders are implemented, then gain and phase error correction is improved, but device complexity increases
Solution Approach 1:
The patent transforms the error correction approach by changing the mathematical parameters from traditional multiplier-adder correction functions to exponential operations. By expressing the correction in terms of exponential relationships between the in-phase and quadrature-phase signals, the system achieves gain and phase error correction with reduced circuit complexity, as exponential operations can be more efficiently implemented than multiple sequential multiplications and additions.
Data Source
AI summary
A receiving circuit and method for receiving an amplitude shift keying signal is provided. At least one exponent signal, an exponent-removed in-phase signal, and an exponent-removed quadrature-phase signal are generated from an in-phase input signal and a quadrature-phase input signal. An amplitude is determined as a sum of several summands, whereby the summands are determined from the exponent signal and/or from the exponent-removed in-phase signal and/or from the exponent-removed quadrature-phase signal (Q′), and wherein the amplitude (A) is demodulated.