Video Signal Booster for VGA signals

Since the output signals of many computers in terms of output impedance and level are not designed for long video cables, the video signal booster VSB provides each for HS and VS a signal driver. The entrance is insensitive to overshoot, whose level in TTL are switching range thanks to its dynamic hysteresis. The output is terminated with ferrites to drive both short and long signal lines. The power supply of the buffer is recovered, separated from HS and VS.

VSB signal timing are partially in industrial PCs up to 220 ohm series resistors to the HS and VS-lines, which can cause image distortion in the form of twitching and horizontal stripes. The oscillogram shows the difference of the HS signal with and without a video signal booster. If the output of the graphics card is terminated to a low or high impedance, comes on the display due to the mismatch with the undefined impedance of the VGA cable a verschliffenes signal which may cause the worst case for the display of two or more separate switching edges (upper curve) , With video-signal booster the AC impedance is defined by storage capacitors and driver ICs kept low and thus the switching edge optimally passed (lower curve).

The video signal booster is also available as a module for permanent installation in industrial PCs and can also be powered externally with 5V or 3.3V.

Order number	Description
1EMVSB	Sync signal contour booster for enhanced sync signals Supply free at sufficient signal levels
1EMVSB-M	Sync signal contour booster for enhanced sync signals Supply free at sufficient signal levels Optimal sync signal generation with 5VDC supply