Technology of Q 2500 colour TV set

Technology of Q 2500 colour TV set- RGB driver stages- Beam current limiter circuit- Automatic cut off control- I²C bus interface and control register- DAC for programmable d.c. voltage− PLL for generation of cycle frequency− Control block for the synchronisation of theoutput stages− DAC for O/W, V control and H output stage− Beam current dependent correction of thevertical and horizontal amplitude and beamcurrent dependent H phase correction.− I²C bus interface4.7.1 Matrix circuits and signalselectionThe R-Y, B-Y and the Y signals are fed to theIC via pins 26, 27 and 28. The green componentis recovered and the RGB signals producedusing two matrix circuits, one after theother.These RGB signals are fed to a selection circuit,to which the RGB signals from the CCUvia pins 2, 3 and 4 and from the VGA-interfacevia pins 35, 36 and 137 are also fed. With thiscircuit the required signal is selected or twosignals mixed together.− Horizontal start up controlDocument Q 2500 103 © Loewe ProCollege