Voltage Controlled Equalizer Network for CATV Tilt Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current CATV infrastructure requires manual replacement of discrete tilt networks to adjust for varying cable lengths and system conditions, which is costly and inefficient.
Innovation Solution
A voltage-controlled equalizer network that uses reactive components to modify the performance of a variable attenuation network, allowing for electronic adjustment of tilt levels without swapping tilt networks, and can be implemented as part of a variable gain amplifier to maintain constant impedance and reduce manual labor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If discrete tilt networks are manually replaced to adjust for varying cable lengths, then the tilt level can be optimized for different system conditions, but the cost increases and manual labor is required
Solution Approach 1:
The patent implements a voltage-controlled tilt network where the tilt level can be dynamically adjusted by changing the control voltage applied to the attenuator circuit. This replaces the static discrete tilt networks with a continuously adjustable dynamic system, allowing optimization for different cable lengths without manual replacement of physical components.
Solution Approach 2:
The invention changes the operating parameter of the tilt network from fixed discrete values to continuously variable values controlled by voltage. By adjusting the control voltage parameter, the tilt level can be precisely tuned to match different cable run lengths and system conditions, eliminating the need for manual component replacement.
2Adaptability or versatility
If a broad range of discrete tilt networks is maintained for different cable runs, then all system conditions can be accommodated, but device complexity and inventory requirements increase
Solution Approach 1:
The voltage-controlled tilt network serves multiple functions that previously required different discrete networks. A single circuit design can accommodate all cable run lengths and system conditions by adjusting the control voltage, making the system universal and eliminating the need to maintain multiple specialized tilt networks in inventory.
Solution Approach 2:
The dynamic voltage control capability allows one tilt network to adapt to all possible system conditions, replacing the need for a static collection of discrete networks. The single circuit can be tuned to any required tilt level, providing versatility without increasing physical complexity or inventory requirements.
3Reliability
If technicians manually swap tilt networks in the field, then the correct tilt level can be installed, but installation time and labor costs increase
Solution Approach 1:
The patent replaces the mechanical process of physically swapping tilt network components with an electrical control mechanism. Instead of manually installing different physical networks, technicians can electronically adjust the tilt level by applying the appropriate control voltage, dramatically speeding up installation and eliminating the need to carry multiple discrete networks.
Solution Approach 2:
The dynamic voltage adjustment capability allows tilt level changes to be made instantly without physical intervention. This enables rapid adaptation to different cable lengths during installation or operation, significantly improving installation productivity while ensuring the correct tilt level is achieved.
Data Source
AI summary
An apparatus includes a radio frequency (RF) input port, an RF output port, a variable attenuation network, a first filter network, a second filter network, and a third filter network. The variable attenuation network may be coupled between the RF input port and the RF output port. Attenuation of the variable attenuation network is controlled by a first control signal and a second control signal. The first filter network may be connected between the RF input port and the RF output port. The second filter network may be connected between the variable attenuation network and a ground potential. The third filter network may be connected between the variable attenuation network and the ground potential. The first, the second, and the third filter networks modify performance of the variable attenuation network to produce a particular tilt of a radio frequency signal passing through the apparatus between the RF input port and the RF output port. The particular tilt is selectable by adjustment of at least one of the first and the second control signals.