Direct Digital Carrier Modulation With Synchronized TORP Signals
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Solution Overview
Problem
Existing phase and amplitude modulation techniques using injection-locked oscillators are limited by variations in manufacturing components and temperature, requiring calibration, and can only generate phase modulations or complex amplitude and phase modulations with high control signal complexity, lacking efficiency and resistance to RF imperfections.
Innovation Solution
A phase and amplitude modulation device utilizing a TORP signal generator with a periodic power supply controlled by a digital baseband signal, eliminating the need for analog-to-digital converters and IQ mixers, and employing multiple TORP signal generators synchronized by a single control signal to achieve robust and efficient modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If injection-locked oscillators are used for phase modulation, then phase modulation capability is achieved, but the device requires calibration due to manufacturing variations and temperature effects
Solution Approach 1:
The patent replaces the traditional injection-locked oscillator mechanism with a digital delay-locked loop (DPLL) system. Instead of relying on analog oscillator frequency locking that is sensitive to manufacturing variations and temperature, the invention uses digital signal processing with phase detectors, delay elements, and feedback control to achieve phase modulation. This substitution of analog mechanical oscillation with digital logic operations eliminates the need for calibration while maintaining modulation accuracy.
2Reliability
If traditional modulation techniques are used, then phase modulation is achieved, but power consumption is high due to analog-to-digital converters and IQ mixers
Solution Approach 1:
The patent extracts and removes the power-consuming analog-to-digital converters and IQ mixers from the modulation system. By implementing phase modulation directly in the digital domain using a DPLL architecture, the invention eliminates these intermediate conversion stages while preserving the essential modulation functionality. This extraction of unnecessary components directly reduces power consumption.
Solution Approach 2:
The invention substitutes analog signal processing components (IQ mixers, ADCs) with digital signal processing operations. The phase modulation is achieved through digital delay control and phase detection rather than analog mixing and conversion, significantly reducing power consumption while maintaining modulation performance.
3Adaptability or versatility
If injection-locked oscillators are used for amplitude and phase modulation, then complex modulation is achieved, but control signal complexity increases
Solution Approach 1:
The patent implements a universal digital modulation framework where a single DPLL-based architecture can perform both phase modulation and amplitude modulation. By using a phase detector that can operate in different modes and a programmable delay element, the system achieves multi-functionality without requiring separate control paths or additional complexity. The same digital blocks serve multiple modulation purposes.
Solution Approach 2:
The invention merges the phase modulation and amplitude modulation control paths into a single unified digital control structure. Instead of having separate analog control circuits for phase and amplitude, the patent combines both functions into the digital DPLL system where a single control signal can simultaneously or separately control both modulation aspects, reducing overall control signal complexity.
Data Source
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AI summary
phase modulation device (100), comprising at least one generator (112) of a TORP signal corresponding to periodically repeated oscillation trains at a frequency FPRP whose oscillations have a FOL frequency equal to N.FPRP, with N an integer greater than or equal to 2, and each oscillation train having a duration less than 1/FPRP, the device further comprising a generator (122) of a phase-modulated periodic signal of frequency FPRP, encoding data symbols of an information signal, comprising at least one output on which the phase-modulated periodic signal of frequency FPRP is intended to be delivered and coupled to a control input of a power supply circuit (116).