Programmable Baseband Filter Auto-Calibration for Mobile DVB-T Tuners
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Solution Overview
Problem
Conventional DVB-T tuners for mobile devices face challenges in minimizing form factor, reducing power consumption, and maintaining channel selection capabilities due to process and temperature variations, leading to increased power consumption and high external component counts.
Innovation Solution
A programmable baseband filter system with auto-calibration capabilities is integrated into a single-chip multi-band RF receiver, allowing for adjustment of filter bandwidth and cut-off frequency to optimize frequency response, using a Chebyschev filter with on-chip auto-calibration to maintain performance across varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional DVB-T tuners use external tracking and SAW filters for channel selection, then channel selection capability is maintained, but device complexity and external component count increase
Solution Approach 1:
The patent integrates the tracking filter and channel selection functionality directly into the RF receiver chip, merging previously external SAW filters and tracking filters into on-chip programmable baseband filters. This integration eliminates external components while maintaining channel selection capability through digital programmability and auto-calibration.
Solution Approach 2:
The patent replaces traditional analog SAW filters and external tracking filters with programmable digital baseband filters implemented in CMOS technology. This substitution allows channel selection to be achieved through digital signal processing rather than relying on external passive filter components.
2Area of moving object
If conventional DVB-T tuners are designed for mobile devices, then form factor is reduced, but power consumption increases due to process and temperature variations affecting filter performance
Solution Approach 1:
The patent implements an auto-calibration system that continuously monitors and adjusts the baseband filter characteristics based on detected signal quality and environmental conditions. This feedback mechanism compensates for process and temperature variations, maintaining optimal filter performance without requiring excessive power for re calibration or external compensation circuits.
Solution Approach 2:
The patent employs programmable baseband filters with dynamically adjustable bandwidth and cut-off frequency parameters. This dynamic adaptability allows the filter to optimize its performance for different operating conditions and channel configurations, reducing power consumption by avoiding the need for multiple fixed filters or external adjustment components.
3Reliability
If conventional DVB-T tuners maintain channel selection capabilities across varying conditions, then reliability is improved, but device complexity increases due to process and temperature variations
Solution Approach 1:
The patent replaces external tracking filters and adjustment mechanisms with on-chip programmable baseband filters controlled by digital logic. This substitution maintains channel selection capability across varying conditions through software-controlled parameter adjustment rather than requiring external hardware components.
Solution Approach 2:
The patent implements an auto-calibration feature that allows the baseband filter to automatically adjust its own parameters to maintain optimal performance. This self-service capability compensates for process and temperature variations without requiring external calibration equipment or additional control components, thereby maintaining reliability while reducing device 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
The solution enables smaller form factor, lower power consumption, and improved channel selection capabilities, enhancing the mobile digital cellular television experience by maintaining performance across different environmental conditions.
Implementation Method 1
A programmable baseband filter system with auto-calibration capabilities is integrated into a single-chip multi-band RF receiver, allowing for adjustment of filter bandwidth and cut-off frequency to optimize frequency response, using a Chebyschev filter with on-chip auto-calibration
Data Source
AI summary
Methods and systems for programmable baseband filters supporting auto-calibration in a mobile digital cellular television environment are provided. Aspects of the method may include generating within a single-chip multi-band RF receiver, at least one control signal based on signal strength of a baseband frequency signal generated within the single-chip multi-band RF receiver. A bandwidth of a filter integrated within the single-chip multi-band RF receiver may be adjusted via the generated at least one control signal. The filter may be used for filtering the generated baseband frequency signal. A frequency response signal of the filter integrated within the single-chip multi-band RF receiver may be determined via a reference frequency signal. An attenuated reference frequency signal may be generated by attenuating the reference frequency signal. The attenuated reference frequency signal may be compared with the frequency response signal. The at least one control signal may be generated based on the comparison.