Constant-current vertical amplifier
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United States of America Patent
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Feb 12, 1980
Grant Date -
N/A
app pub date -
Oct 3, 1977
filing date -
Oct 3, 1977
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A vertical amplifier provides a deflection or yoke current independent of the yoke impedance or other impedances in the yoke current path. The amplifier comprises a general-purpose operatonal amplifier that develops an output voltage in a manner that maintains identical voltages at its inverting and non-inverting inputs. A feedback resistance is connected in the yoke current path, thereby developing a voltage indicative of the yoke current. As a result, the yoke current waveform can be made identical to or a desired variation of a current commanding voltage waveform applied to the non-inverting input. A particular variation of the feedback resistance transforms an S-shaped current waveform into a sawtooth voltage waveform, thereby providing the desired deflection linearity.
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