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VGA Splitter
VGA Splitter

Ground loop isolated VGA splitter

High resolution up to 2048x2048Ground loop isolationBooster amplifierMulti purpose
bad ground loopground loop noiseground loop fixedground loop background
Eliminate ground loop noise
Using the Epiphan VGA Splitter

VGA Splitter

High Quality Active Splitter with built in booster amplifier and ground loop isolation.

Features at a glance

Epiphan’s active VGA Splitter GLI™ has a high-bandwidth 1 GHz signal amplifier that taps the incoming VGA source and splits it into two VGA outputs. There is no loss in picture quality, resolution or power and no additional loading limitations on VGA cable length.

Advanced users can also create multiple VGA output port complexes by daisy chaining two or more VGA Splitter GLIs together to create various combinations of fault-tolerant and ground loop isolated ports.

This product is ideal for applications in noisy signal environments and multi monitor applications where the quality of the split VGA signals are critical.

  • Splits an incoming VGA cable into a fault-tolerant pass through VGA output and one ground loop isolated VGA output
  • Integrated ground loop isolation circuit reduces picture noise in a VGA stream
  • Designed to meet the needs of 2048 x 2048 displays in ATC/ATM control room applications
  • High Bandwidth (1 Ghz) VGA signal preservation protects VGA output signals in a noisy environment, without any loss in picture quality, resolution, power or additional loading on VGA cable length

VGA Splitter - animated diagram


High Quality Active Splitter with built in booster amplifier and ground loop isolation. The fault tolerant main output port ensures that even if power to the VGA Splitter is suddenly cut, one VGA output port will still work.

  • Multiple Epiphan splitters can be daisy chained to create multiple isolated VGA output ports
  • Works well with Epiphan’s family of Video Grabbers and Streaming/Recording solutions

Fault tolerant output port

A fault tolerant output port ensures that even if power to the VGA Splitter is suddenly cut, the fault tolerant VGA output port continues to work.

Ground Loop Isolator

The second output port on the VGA Splitter has an integrated ground loop isolation circuitry to reduce picture noise in a VGA stream. Noise often is visible in a VGA monitor when there is a ground loop in the power wiring within an event venue, conference room, home, office, or industrial environment caused by differences in the electrical system. VGA Splitter works by breaking the ground between the VGA source and output display, eliminating the path for the current from an electrical imbalance to flow and eliminating all VGA noise caused by a ground loop. If using VGA Splitter with only one output, use a VGA terminator on the fault tolerant port to ensure ground isolation is active.

Ground loop

Examples of ground loop noise:

  • A venue has a number of PCs and display sources connected to a switch, which is then split with a Y-cable to a projector and a recording system. The display sources may be operating from a battery source, or one more different electrical circuits in the venue. The audio system and video recording systems may also happen to be in different parts of the venue, each powered by a separate electrical circuit – with possibly different ground references. The ground loop(s) between all these devices can create ground loop noise in the system and distort the image quality
  • Air traffic control rooms have multiple high resolution monitors, systems and servers that draw a lot of power. Recording systems and backup systems are often located on separate power circuits, backup or redundant power sources, each with different grounds, therefore creating ground loops.
  • Industrial sites with high powered machinery on a plant floor will often have different power sources than control systems and office equipment monitoring the plant operations. This is done by design to avoid inductive loading effects caused from the start/stop of high powered machines, however the machines on the plant floor and the factory control room may therefore float from different grounds – creating ground loops in the monitors

1GHz Signal Bandwidth

Epiphan’s splitter circuitry eliminates noise using a high bandwidth differential amplifier technique. This approach provides high signal quality for frequencies up to 1GHz which means that resolutions up to 2048×2048@85Hz are sup­ported, with no loss in picture quality.