Variable-Delay RF Path Control to Suppress Clock Harmonics
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Solution Overview
Problem
In communication systems, radio frequency signals are interfered with by digital clock signals and their harmonics, which reduce the quality of the RF signal due to the digital block's operation as an interference aggressor within the RF spectrum.
Innovation Solution
A device is introduced that includes an interface to receive a first clock signal, a delay circuit to add variable delays based on a delay control signal, and a controller to generate the delay control signal, creating a second clock signal with variable delays to control the RF path, thereby reducing interference by 'smearing out' harmonic contributions over a wider frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a digital block is used to control elements of the radio frequency path, then the operation is automated and precise, but harmonics of the clock signal interfere with the radio frequency spectrum and reduce signal quality
Solution Approach 1:
The patent applies dynamics by making the clock signal period variable rather than fixed. The controller dynamically adjusts the period of the clock signal used to control RF path elements, ensuring that harmonics do not align with RF signal frequencies. This dynamic adjustment prevents persistent interference while maintaining automated control of the RF path.
2Manufacturing precision
If clock signals are used to control digital blocks in the RF path, then precise timing control is achieved, but harmonic distortion reduces the quality of radio frequency signals
Solution Approach 1:
The patent changes the temporal parameters of the clock signal by introducing variable periods. Instead of using a fixed-frequency clock signal that produces stable harmonics, the system varies the clock period according to a predetermined pattern. This parameter change shifts harmonic frequencies dynamically, preventing them from consistently interfering with RF signal bands while preserving timing control precision.
3Stability of the object's composition
If fixed period clock signals are used for controlling digital blocks, then simple and stable operation is maintained, but harmonic interference occurs within the radio frequency bandwidth
Solution Approach 1:
The patent employs periodic action by using a clock signal whose period varies according to a predetermined periodic pattern. This periodic variation in clock period causes the harmonics to sweep through different frequency ranges periodically, ensuring that they do not remain stationary within the RF signal bandwidth. The operational stability is maintained through the systematic and predictable nature of this periodic variation.
Data Source
AI summary
According to an embodiment, a device includes an interface configured to receive a first clock signal. A delay circuit is configured to add variable delays to the first clock signal based on a delay control signal to generate a second clock signal with variable delays. A delay control signal is generated by a controller clocked by the second clock signal. The device further includes a radio frequency path, and the device is configured to control the radio frequency path based on the second clock signal.