Tuner IC with Shared ADC for Terrestrial and Satellite Broadcasting
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Solution Overview
Problem
Conventional demodulation LSIs for terrestrial and satellite digital broadcasting require three analog digital converters (ADCs) due to the need for separate inputting of IF signals for terrestrial broadcasting and BB(I) and BB(Q) signals for satellite broadcasting, leading to increased layout size and cost.
Innovation Solution
A tuner IC is designed with an IF output terminal for terrestrial broadcasting, a first output terminal for outputting either the IF signal or BB signals with orthogonal phases from satellite broadcasting, and a second output terminal for outputting the other BB signal, allowing for reduced ADC count and layout size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If three ADCs are independently provided for inputting IF signal for terrestrial broadcasting and BB(I) and BB(Q) signals for satellite broadcasting, then the reception functions for both broadcasting types are separately implemented, but the layout size and cost increase
Solution Approach 1:
The patent applies multi-functionality by designing a unified signal input interface that can accept both terrestrial broadcasting IF signals and satellite broadcasting BB signals through a single ADC. The ADC is configured to demodulate both signal types by detecting orthogonal phases (0° and 90°), eliminating the need for separate ADCs for each broadcasting type and thereby reducing layout size while maintaining versatile reception capabilities
Solution Approach 2:
The patent merges the functionality of multiple ADCs into a single ADC that handles both terrestrial and satellite signal demodulation. By combining the input functions for IF signals and BB signals into one shared ADC component, the patent reduces the total number of ADCs from three to one, directly addressing the layout size constraint while preserving adaptability for both broadcasting types
2Adaptability or versatility
If three ADCs are independently provided for inputting IF signal for terrestrial broadcasting and BB(I) and BB(Q) signals for satellite broadcasting, then separate inputting is achieved, but the cost increases
Solution Approach 1:
The patent implements a universal ADC design that can demodulate both terrestrial IF signals and satellite BB signals through a single component. This multi-functional approach eliminates the need for multiple separate ADCs, reducing manufacturing cost while maintaining the capability to handle different signal types through phase detection
Solution Approach 2:
The patent combines multiple ADC functions into a single integrated ADC that processes both terrestrial and satellite signals. This merging reduces the component count from three ADCs to one, directly lowering manufacturing cost while preserving separate inputting capability through signal routing and phase detection mechanisms
Data Source
AI summary
The present technology relates to a tuner IC capable of reducing the cost of a demodulation LSI.A tuner includes an IF output terminal configured to output an IF signal of terrestrial broadcasting, a first output terminal configured to output the IF signal or one of BB signals that are output signals of satellite digital broadcasting and have orthogonal phases, and a second output terminal configured to output another of the BB signals. The present technology can be applied to a broadcast receiving system.