| 摘要 |
A circuit in accordance with an inventive arrangement comprises: a signal generator for a correction signal having a substantially parabolic shape at a scanning rate of the video display; a waveform clipper coupled to the signal generator for the correction signal, the waveform clipper having a current sink transistor coupled to the signal generator for the correction signal for clamping the correction signal, and a reference transistor coupled to a base of the current sink transistor for providing a reference voltage; and, a switch for disabling the reference transistor during excursions of the correction signal and enabling the reference transistor during clamping. The switch may comprise a switching transistor coupled to the reference transistor and to the correction signal, the switching transistor disabling the reference transistor during excursions of the correction signal and enabling the reference transistor during clamping.
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