Digital TV Chip Multiplexer Layout for Shared Signal Conversion
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Solution Overview
Problem
Digital television systems require multiple analog-to-digital converters and analog front ends to handle various analog signals, leading to increased chip size and complexity.
Innovation Solution
A digital television chip design that uses a multiplexer to share converting units among different analog signals, allowing one or more converting units to handle multiple signal types based on control signals, thereby reducing the number of required units and chip size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple converting units are used to handle various analog signals, then signal conversion capability is improved, but chip size and complexity increase
Solution Approach 1:
The patent implements a converting unit that can perform multiple conversion functions (CVBS to YCbCr, S-Video to YCbCr, VGA to RGB) through a single integrated structure. The converting unit includes multiple converters that can be selectively activated based on the input signal type, allowing one unit to replace what would traditionally require multiple separate converting units, thus reducing chip size while maintaining comprehensive signal conversion capability
Solution Approach 2:
The patent combines multiple converting functions into a single converting unit structure. By merging the CVBS converter, S-Video converter, and VGA converter into one integrated unit with shared components and control logic, the design reduces the total number of separate hardware blocks needed on the chip, directly addressing the chip size reduction goal while preserving all necessary conversion capabilities
2Adaptability or versatility
If multiple converting units are used to handle various analog signals, then signal conversion capability is improved, but device complexity increases
Solution Approach 1:
The converting unit is designed as a universal module that can handle multiple signal types (CVBS, S-Video, VGA) and perform multiple conversion functions (to YCbCr, RGB, and other formats). This multi-functional design reduces the number of separate converting units needed, thereby reducing device complexity while maintaining comprehensive signal handling capability
Solution Approach 2:
The patent employs dynamic selection mechanisms where the converting unit's operation mode is controlled by control signals that determine which converter within the unit is activated based on the input signal type. This dynamic control allows a single converting unit to adaptively perform different conversion functions, reducing complexity compared to having multiple static converting units for each signal type
Data Source
AI summary
A digital television chip having a reduced layout size is disclosed, comprising a multiplexer, and first and second converting units. The multiplexer, according to a control signal, outputs one of S-video signals SY and SC to the first converting unit, outputs the other of the S-video signals SY and SC to the second converting unit, outputs one of Tuner CVBS signals VIF and SIF to the first converting unit, outputs the other of the Tuner CVBS signals VIF and SIF to the second converting unit, or outputs a CVBS Line-in Video signal to one of the first and second converting units, for reducing the size of the chip. The first converting unit converts one of the S-video signals SY and SC, one of the Tuner CVBS signals VIF and SIF, or the CVBS Line-in Video signal into a first digital signal for signal processing. The second converting unit converts one of the S-video signals SY and SC, one of the Tuner CVBS signals VIF and SIF, or the CVBS Line-in Video signal into a second digital signal for signal processing.