Programmable Sampling Band Pass Filter for Multi-Band Radio Integration
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Solution Overview
Problem
Conventional multi-band digital intermediate frequency (IF) radio systems require multiple programmable RF translations, leading to large size and cost due to the need for high-quality band pass filters, which are expensive and bulky, and lack integrability and flexibility in RF communication circuitry.
Innovation Solution
A programmable IF sampling band pass filter with a sampled signal resonator stage, including reversible attenuators and clock delay circuits, that provides adjustable bandwidth and frequency control, allowing for reduced RF translations and integration into single multi-chip module receivers and exciters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional multi-band digital IF radio systems use high-quality band pass filters for minimal in-band distortion, then filtering performance is improved, but size and cost increase
Solution Approach 1:
The patent replaces conventional mechanical/analog band pass filters with a digital signal processing approach using a sampling band pass filter implemented in the digital domain. This substitution eliminates the need for bulky analog filter components while maintaining filtering performance through digital algorithms that process the sampled signal to achieve the desired frequency selection and distortion reduction.
Solution Approach 2:
The patent employs a sampling band pass filter where the center frequency and bandwidth are controlled by programmable parameters rather than fixed physical components. By changing digital control parameters, the filter can be reconfigured for different frequency bands and bandwidth requirements, providing multi-band operation without requiring multiple physical filters, thus reducing overall size and cost.
2Reliability
If conventional multi-band digital IF radio systems use high-quality band pass filters, then filtering performance is improved, but cost increases
Solution Approach 1:
The sampling band pass filter is designed as a universal digital processing block that can serve multiple functions across different frequency bands and signal types. A single multi-functional digital filter implementation replaces the need for multiple specialized analog filters for different bands, reducing component count, manufacturing complexity, and overall system cost while maintaining the required filtering performance for each band.
Solution Approach 2:
By replacing expensive analog filter hardware with a digital sampling-based filtering approach, the system eliminates the need for precision-manufactured analog filter components. The digital implementation can be realized using standard digital signal processors or FPGAs, which are more cost-effective and easier to manufacture at scale compared to high-performance analog filters.
3Reliability
If conventional systems require multiple RF translations to establish received signal, then signal fidelity is maintained, but device complexity increases
Solution Approach 1:
The patent replaces multiple analog RF translation stages with a single sampling-based digital processing approach. By using a sampling band pass filter in the digital domain, the system can achieve the necessary frequency conversion and signal processing functions that previously required multiple sequential RF translations, thereby reducing device complexity while maintaining signal fidelity through precise digital control.
Data Source
AI summary
A variable bandwidth, sampled analog filter can be programmed to have a variety of responses. A variable bandwidth, sampled analog filter is preferably a sampled analog resonator based filter that receives a bandwidth control input and a sample clock input. The sampled analog resonator units can include clock delay circuits and reversible (loss/gain) attenuators.