GT4123 simple video mixer


Posted on Dec 8, 2012

The GT4123 and GT4123A are the first dedicated single device, two input video mixer ICs available to the professional video and multimedia markets. Each input signal is applied to a conventional differential amplifier (AMP A and AMP B). From the amplifiers, the signals are applied to analog multiplier circuits (XA and XB) whose outputs are the product of the input signals and internally generated controlling voltages VCA and VCB.



There is a small dead band at either extreme of the CONTROL input. The amount of dead band is about 100 mV and is shown in Figure 2. The CONTROL input can be preceded by an operational amplifier so biased as to overcome th




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