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Video luminance matrix circuit composed of broadband transco

2016-09-10 12:59  
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Video luminance matrix circuit composed of broadband transconductance op amp and buffer OPA660
The OPA660 forms a common-base amplifier circuit, and its pin 2 has three-way signal inputs: red VRED, green VGREEN and blue VBLUE, the signals are amplified by internal OTA and +1 amplifier to become luminance signal VLUMINANCE which is output from pin 6. The accuracy of the resistor connected to three-way signals is 1 %, resulting in the RGB mixing ratio of 30%: 59%: 11%.