Shared RF Reference Clock Compensation for Frequency Offset Control
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Solution Overview
Problem
In modern electronic devices with multiple wireless communications blocks, sharing a single oscillator for reference clock signals can lead to performance degradation in other blocks due to dramatic frequency jumps when one block adjusts its carrier frequency offset without considering others.
Innovation Solution
A processing unit detects frequency offsets between RF modules and base stations, controlling both the oscillator and a compensation unit to adjust reference clock signals gradually, ensuring that the frequency offset is compensated without causing significant frequency variations in other blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single oscillator is shared by multiple wireless communications blocks to reduce cost, then product cost is reduced, but performance of other blocks may be degraded due to dramatic frequency jumps when one block adjusts its carrier frequency offset
Solution Approach 1:
The patent segments the frequency adjustment process into two independent parts: (1) a shared oscillator that provides the reference clock signal, and (2) individual compensation units in each wireless communications block that independently compensate for frequency offsets. This allows each block to maintain its own frequency stability while sharing the oscillator resource, resolving the contradiction between cost reduction and performance maintenance.
Solution Approach 2:
The patent introduces compensation units as intermediary components between the shared oscillator and each wireless communications block. These compensation units act as mediators that independently adjust and stabilize the frequency for each block, preventing the dramatic frequency jumps from affecting other blocks while still utilizing the shared oscillator resource.
2Measurement precision
If frequency offset is removed by adjusting the oscillator frequency, then demodulation accuracy is improved, but other wireless communications blocks experience performance degradation due to frequency variations
Solution Approach 1:
The patent separates the frequency compensation function into individual compensation units for each wireless communications block, rather than using a single centralized adjustment mechanism. Each compensation unit independently handles frequency offset compensation for its respective block, ensuring that demodulation accuracy is improved for each block without causing performance degradation in others.
Solution Approach 2:
The patent applies local quality by providing each wireless communications block with its own compensation unit that is specifically tailored to that block's frequency requirements. This localized compensation approach ensures that frequency adjustments are made precisely where needed, improving demodulation accuracy locally without disrupting other blocks that have their own independent compensation mechanisms.
Data Source
AI summary
An electronic apparatus includes a processing unit. The processing unit, when detecting a frequency offset between an radio frequency (RF) module and a corresponding base station (BS), controls an oscillator to change a frequency of a first reference clock signal outputted therefrom by a first frequency variation, and controls a compensation unit to change a frequency of a second reference clock signal outputted therefrom by a second frequency variation. Wherein the compensation unit receives and adjusts the first reference clock signal from the oscillator to output the second reference clock signal, and the frequency offset substantially equals the first frequency variation plus the second frequency variation.