PHASE DETECTING CIRCUIT

摘要: PURPOSE:To enhance the resistance to noise and detection sensitivity even if a supply voltage is low, by subjecting phase signal corresponding difference between burst in carrier chrominance reference subcarrier exponential expansion after logarithmic compression. CONSTITUTION:The inputted an input terminal 1 supplied gate circuit 2, separated pulse detector 4. The from 5 has compared with of signal, having level compression 9. which amplitude subjected 9 shifted DC shifting 10 restored amplifying 11. Thereafter, only taken out 12 outputted output 13 through low pass filter 6.