Back to results
US 5,614,793 AGranted
Deflection circuit responsive to differential sawtooth signals
AssigneeThomson Consumer Electronics, Inc.
InventorJames A. Wilber
Life of this patent
Estimating the term…
Abstract
A pair of current sources, each having a high output impedance, are coupled to a pair of first and second inputs of a differential input stage of a vertical deflection amplifier. An output of the amplifier is coupled to a vertical deflection winding. A current sampling resistor is coupled to the first input via a first resistor. The second input is coupled via a second resistor to a terminal of the sampling resistor that is remote from the first resistor. The first and second resistors are matched resistors for providing differential driving.
Claims8
A video deflection apparatus, comprising:
- a cathode ray tube;
- a deflection winding mounted on a neck of said cathode ray tube;
- a deflection amplifier coupled to said deflection winding and having a pair of first and second inputs for generating a deflection current in said deflection winding;
- a pair of first and second resistors;
- a current sampling resistor coupled to said deflection winding for generating a feedback signal that is coupled to one of said first and second resistors;
- a sawtooth signal generator for generating a pair of differential, first and second sawtooth currents at a frequency that is related to a deflection frequency coupled to said first and second resistors, to develop, in accordance with each of said first sawtooth current, said second sawtooth current and said feedback signal, first and second voltages that are coupled to said first and second inputs, respectively, to control said deflection current, said sawtooth generator having an output impedance in a current path that includes one of said first and second resistors that is substantially higher than that of one of said first and second resistors, such that a current in said current path is substantially independent of said one resistor included in said current path.
3 more elements
Dependencies are inferred from the claim text.