RF-Modem Chip Frame Synchronization for Frequency Offset Control
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Solution Overview
Problem
Digital communication between RF chips and modem chips leads to performance degradation due to increased channel numbers and frequency offset, causing latency variation and power consumption issues.
Innovation Solution
A modem chip with a digital interface and logic block that generates a frame synchronization signal to synchronize data samples, along with a phase-locked loop (PLL) for clock signal control, reduces latency and frequency offset by ensuring synchronized communication between RF and modem chips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If digital communication is used between RF chip and modem chip, then data transmission capability is improved, but frequency offset and performance degradation occur
Solution Approach 1:
The patent implements a feedback mechanism where the modem chip generates a frame synchronization signal based on its internal clock, transmits it to the RF chip, and the RF chip adjusts its clock phase based on the received synchronization signal. This closed-loop feedback system eliminates frequency offset and performance degradation while maintaining digital communication capabilities.
2Adaptability or versatility
If different clock sources are used in RF chip and modem chip, then operational independence is improved, but frequency offset occurs
Solution Approach 1:
The frame synchronization signal acts as an intermediary between the modem chip's clock source and the RF chip's clock source. The RF chip uses this intermediary signal to adjust its clock phase, thereby eliminating frequency offset while maintaining the benefit of independent clock sources.
3Speed
If data bandwidth is increased, then data transmission rate is improved, but number of channels increases
Solution Approach 1:
The patent combines multiple data channels into a unified frame structure that is synchronized by a single frame synchronization signal. This merging approach allows high-speed data transmission across multiple channels while maintaining synchronization through one centralized control mechanism, thereby reducing overall system complexity.
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 prevents performance degradation, reduces latency variation, and minimizes power consumption and RF interference by ensuring synchronized operations between RF and modem chips.
Implementation Method 1
a phase-locked loop (PLL) that generates a clock signal having a frequency and phase controlled by an input signal
Data Source
AI summary
A modem chip communicates with a radio frequency (RF) chip and includes a digital interface configured to receive data including a plurality of samples from the RF chip based on digital communication. A logic block generates a frame synchronization signal based on a clock signal in the modem chip, provides the generated frame synchronization signal to the digital interface, and receives the plurality of samples in synchronization with the frame synchronization signal.