Multi-Tuner RF Splitter With Low-Impedance Output
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Solution Overview
Problem
Multi-tuner apparatuses face signal degradation and increased power dissipation due to the use of multiple active splitters, which lead to non-linear distortion and reduced signal-to-noise ratio as RF signals pass through each splitter, especially when connecting multiple tuners to a single RF source.
Innovation Solution
A single active splitter with a low impedance output (10 Ω) is used to drive multiple tuners with high impedance inputs (e.g., 10 kΩ), minimizing the need for additional splitters and reducing power dissipation by maintaining short connections to prevent signal reflections and using buffer stages to achieve high tuner input impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple active splitters are used to connect multiple tuners to an RF source, then the number of tuners that can be connected is increased, but signal degradation and non-linear distortion increase
Solution Approach 1:
The patent merges multiple tuner inputs into a single splitter output by using a high-impedance input stage that can simultaneously accept multiple tuner connections without requiring additional splitters. This consolidation eliminates the signal degradation that occurs when RF signals pass through multiple cascaded splitters.
Solution Approach 2:
The patent changes the impedance parameter of the input stage from conventional 75 Ω to a high impedance state (e.g., 10 kΩ or higher). This parameter change allows the input stage to act as a virtual ground for multiple tuners simultaneously, enabling multiple connections without additional splitters and maintaining signal quality.
2Adaptability or versatility
If multiple active splitters are used to connect multiple tuners, then more tuners can be supported, but power dissipation increases linearly
Solution Approach 1:
The patent combines multiple tuner connections into a single high-impedance input stage, eliminating the need for multiple cascaded splitters. Since each additional splitter in the conventional approach adds to the total power dissipation, this merger directly reduces the linearly increasing power loss associated with adding more tuners.
3Power
If conventional 75 Ω impedance matching is used between splitter and tuners, then RF signal transfer is optimized, but additional splitters are required for multiple tuners
Solution Approach 1:
The patent changes the impedance parameter from the conventional 75 Ω to a high impedance state (10 kΩ or higher). This parameter change fundamentally alters how multiple tuners are connected, allowing them to be tied together at the input stage without requiring additional splitters, thus reducing device complexity while maintaining adequate RF signal transfer.
Solution Approach 2:
Instead of using low-impedance 75 Ω matching that requires additional splitters for multiple tuners, the patent inverts the approach by using high impedance that naturally accommodates multiple tuners without additional components. This inversion simplifies the overall system architecture.
Data Source
AI summary
A multi-tuner apparatus comprises a splitter (S) for received RF signals. The splitter has a splitter output (U) for connection to a plurality of tuners. To reduce signal degradation and dissipation the output impedance of the splitter output is substantially lower than the input impedance of each of the tuners.