Receiver Selectable A/D Sample Clock Frequency
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Solution Overview
Problem
Existing receiver designs face suboptimal analog-to-digital conversion due to fixed sample clock rates, which result from trade-offs between interference, power consumption, and other parameters, leading to non-ideal performance.
Innovation Solution
A receiver with a selectable analog-to-digital sample clock frequency, allowing the sample clock to be chosen based on the frequency of the selected channel to avoid overtones within the bandwidth, thereby optimizing conversion rates and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a fixed sample clock rate is used for analog-to-digital conversion, then the receiver design is simpler and power consumption is reduced, but interference from overtones falls within the channel bandwidth degrading reception quality
Solution Approach 1:
The patent implements a dynamic sample clock frequency selection mechanism where the sample clock frequency is adjusted based on the selected channel frequency. The system includes a channel selection circuit that provides channel frequency information to a sample clock generator, which then selects an appropriate sample clock frequency from multiple available frequencies to avoid placing overtones within the channel bandwidth. This dynamic adaptation resolves the contradiction by making the system flexible rather than fixed.
Solution Approach 2:
The patent changes the parameter of sample clock frequency from a fixed value to a selectable variable. The sample clock generator is configured to select from multiple different sample clock frequencies based on the channel being received. By varying this critical parameter, the system avoids the interference problem caused by fixed-frequency overtones falling within channel bandwidth while maintaining manageable complexity through predefined frequency options.
2Measurement precision
If a higher sample clock rate is used for analog-to-digital conversion, then conversion precision is improved, but power consumption increases
Solution Approach 1:
The patent applies partial action by providing multiple sample clock frequency options rather than using a single high frequency continuously. The sample clock generator selects from several predefined frequencies, using higher frequencies only when necessary for specific channels or conditions, and lower frequencies otherwise. This approach achieves sufficient conversion precision for each specific case without the continuous overhead of maintaining a always-high sample rate.
3Use of energy by stationary object
If a lower sample clock rate is used for analog-to-digital conversion, then power consumption is reduced, but interference from overtones degrades reception quality
Solution Approach 1:
The patent changes the sample clock frequency parameter dynamically based on channel selection. The sample clock generator receives channel frequency information and selects an appropriate sample clock frequency from multiple options to ensure that overtones do not fall within the channel bandwidth. This allows the system to use lower power-consuming frequencies when possible while maintaining reception quality by avoiding interference through intelligent frequency selection.
Data Source
AI summary
A receiver is set forth that includes a tuner circuit and a converter circuit. The tuner circuit provides an analog signal corresponding to a modulated signal that is received on a selected channel. The converter circuit includes a sample clock that is used to convert the analog signal to a digital signal at a conversion rate corresponding to the frequency of the sample clock. The sample clock is selectable between at least two different clock frequencies.