| 摘要 |
PURPOSE:To provide a differential amplification circuit which suppresses the stepped distortion for fall of a vertical deflecting voltage waveform and is stable against even the variance of the supply voltage. CONSTITUTION:Since a control signal SP is differentiated by a first capacity C1, the signal having a certain pulse width is always inputted to a switching transistor TR 1 even if the high level period of the control signal SP is long. The output of the switching TR 1 is integrated by a second capacity C2 and has the level gradually changed, and the current of a second constant current circuit 102 is gradually reduced, and the stepped distortion for fall of the vertical deflecting voltage waveform as the output signal of the differential amplification circuit is suppressed. Since currents of first to third constant current circuits 100, 101, and 102 are determined in accordance with the current of a fourth constant current circuit 103, the operation of the differential amplification circuit is stable regardless of the change of a negative supply voltage. |
