Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
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
Blum Theodore M.
GTE Sylvania Incorporated
Odozynski John A.
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