Constant-current vertical amplifier

Details Constant-current vertical amplifier Constant-current vertical amplifier

1977-10-03

1980-02-12

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315389, H01J 2970, H01J 2972

Patent

active

041885678

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.

REFERENCES:
patent: 3628083 (1971-12-01), Holmes
patent: 3859557 (1975-01-01), Grant et al.
patent: 4004190 (1977-01-01), Simpson
patent: 4019093 (1977-04-01), Klein

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