AD-PLL Phase Shift Control for Coherent RF Modulation
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Solution Overview
Problem
Existing radio frequency (RF) devices lack precise control over the phase shift of transmitted RF signals, which is essential for accurate ranging and bearing applications while maintaining coherent modulation.
Innovation Solution
The implementation of an all-digital phase locked loop (AD-PLL) with a configurable delay block allows for precise control of the phase shift of transmitted RF signals by locking to non-integer multiples of a reference frequency, ensuring coherent modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional phase locked loop circuitry is used, then the device complexity is reduced, but the phase control precision deteriorates
Solution Approach 1:
The patent replaces conventional analog phase locked loop circuitry with an all-digital phase locked loop implementation. This substitution of mechanical/analog components with digital equivalents enables precise phase control through digital signal processing while maintaining manageable system complexity through software-based control mechanisms.
Solution Approach 2:
The patent changes the operating parameters of the phase locked loop by implementing it in the digital domain rather than analog. This parameter change allows for precise control of phase shifts through digital manipulation of the local oscillator signal, achieving high phase control precision without the limitations of analog circuitry.
2Adaptability or versatility
If arbitrary phase shift is implemented, then the adaptability is improved, but the coherent modulation is lost
Solution Approach 1:
The patent implements feedback mechanisms within the all-digital phase locked loop to maintain coherent modulation while enabling arbitrary phase shifts. The feedback control ensures that the local oscillator remains synchronized with the incoming signal, preserving coherent detection capabilities despite arbitrary phase adjustments.
Solution Approach 2:
The patent introduces dynamic phase adjustment capabilities through the all-digital implementation, allowing the phase shift to be changed arbitrarily while maintaining coherent modulation through real-time digital control. The system dynamically adapts phase shifts while preserving the coherent relationship between transmitted and received signals.
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
This solution enables precise control of the phase shift of RF signals, enhancing the accuracy of ranging and bearing applications by allowing full control over the shape of the transmitted RF signal, while maintaining coherent modulation.
Implementation Method 1
an all-digital phase locked loop (AD-PLL) with a configurable delay block allows for precise control of the phase shift of transmitted RF signals by locking to non-integer multiples of a reference frequency
Data Source
AI summary
A method for controlled phase adjustment and coherent modulation in a radio frequency transceiver is provided. The radio frequency transceiver comprises an analogue circuitry for transmitting and receiving radio frequency signals and an all-digital phase locked loop controlled by a Phase Locked Loop, PLL, Control unit (200). The method comprises: receiving a phase shift, and based thereon, deriving a corresponding digital control signal; inputting the digital control signal to the PLL Control unit (200), the control signal defining a temporary iteration pattern of delays to be used by a configurable delay block, DTC (240); locking a radio frequency oscillator signal of a Digital Controlled Oscillator (220) in the phase locked loop to the temporary iteration pattern of delays; adjusting the phase of the frequency signal in digital circuitry, until the signal phase matches the phase shift defined by the digital control signal.