RF Receiver Signal Placement for Lower-Q Filter Integration
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Solution Overview
Problem
Current radio frequency receivers face challenges in reducing power consumption and integrating high-Q radio frequency filters due to the need for bulk acoustic wave or surface acoustic wave components, which increases complexity and reduces integration level, making it difficult to achieve low power consumption and small receiver size.
Innovation Solution
A method involving a communication apparatus that sends two signals at different frequency positions, allowing the radio frequency filter to have a lower Q value requirement, and using an intermediate frequency filter to distinguish between the target signal and interference after envelope detection, thereby reducing the complexity of the radio frequency filter design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high Q value radio frequency filter is used to achieve good filtering effect, then filtering performance is improved, but device complexity increases and integration level decreases due to requiring external BAW or SAW components
Solution Approach 1:
The patent extracts the high-Q filtering function from the radio frequency domain to the baseband domain. By using envelope detection to convert the received signal to baseband, the system can then apply high-Q filtering at lower frequencies where on-chip implementation is feasible, rather than requiring external BAW/SAW components at radio frequency
Solution Approach 2:
The patent introduces envelope detection as an intermediary component between the radio frequency amplifier and the baseband processor. This intermediary converts the RF signal to baseband, enabling the use of integrated on-chip filters instead of external high-Q components while maintaining filtering performance
2Use of energy by moving object
If envelope detection is used to reduce power consumption, then energy efficiency is improved, but signal quality deteriorates due to large noise from the non-linear component
Solution Approach 1:
The patent applies preliminary filtering at the radio frequency stage using a moderate-Q filter to remove out-of-band interference and noise before the signal enters the envelope detector. This pre-conditioning of the signal reduces the noise floor and improves signal quality while still allowing the envelope detector to achieve low power consumption
Data Source
AI summary
A signal sending method, a signal receiving method, and a communication apparatus. A first device sends a first signal to a second device on a first frequency domain unit, and sends a second signal on a second frequency domain unit. The first frequency domain unit includes a first frequency, and the second frequency unit includes a second frequency. An absolute value of a difference between the first frequency and the second frequency is related to one or more of the following: a first bandwidth, a second bandwidth, or a third bandwidth. The first bandwidth is a bandwidth occupied by the first frequency domain unit in frequency domain. The second bandwidth is a bandwidth occupied by the second frequency domain unit in frequency domain. The third bandwidth is a bandwidth occupied by a third frequency domain unit in frequency domain.