| 摘要 |
<p>PURPOSE:To obtain a control signal for the time division of a saw-tooth wave voltage by inputting an input signal which differs in polarity in the former half and latter half of a specific period to inverted input terminals of operational amplifiers, and processing it. CONSTITUTION:The signal Vs which has a positive polarity in the former half of the vertical scanning period and a negative polarity in the latter half is impressed to a terminal 21 and impressed to minus input terminals of operational amplifiers A1 and A2 through resistances R1 and R6. The output of the amplifier A1 is connected to its minus input terminal through diodes D2 and D3, a resistance R2, and a D1 having the polarity opposite to that of the D2 and D3. The output of the amplifier A2 is connected to its minum input terminal through a D5 differing in polarity from the D2 and D3, a resistance R7, and a D4 differing in polarity from the D5. While the signal Vs is positive, the signal Vs, polarity-inverted signal Vs2', and 0-potential signal are outputted from terminals 24 and 25, and while the signal Vs is negative, the 0-potential signal, signal Vs, and polarity-inverted signal Vs1' are outputted from the terminals 24 and 25. The output of the amplifier A1 is passed through a transistor Q1 and an inverter G1 to output signals DV1 and DV2 for the time division of a saw-tooth wave from terminals 22 and 23 respectively.</p> |
