Video mixer GT4122

Posted on Apr 13, 2012

This Circuit shows the GT4122 used as a two input video mixer. An evaluation PC board has been made and the artwork is included. Using this circuit, many of the critical circuit parameters can be measured including Crossfade Balance, Linearity, Bandwidth and Differential Gain and Phase. An output amplifier is shown but is only necessary when driving low impedance loads such as co-axial cables. The load on the GT4122 output itself should be kept above 5kW.

The reference voltage VREF is derived from a simple Zener diode regulator from the +10V supply. It is important to maintain a constant reference voltage for repeatable performance. The circuit shown, or any other stabilized voltage source can be used.

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