Bus controlled arrangement using a duty cycle modulated control

Details Bus controlled arrangement using a duty cycle modulated control Bus controlled arrangement using a duty cycle modulated control

1996-06-24

1998-04-14

Pascal, Robert

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Pulse storing

315370, 361150, H04N 929

Patent

active

057396388

ABSTRACT:
A bus controlled pulse modulator receives a digitally coded signal and generates a pulse-width modulated signal. The pulse-width modulated signal is coupled to a base electrode of a non-committed or open collector transistor. The transistor switches with a controlled duty cycle. The collector of the transistor is coupled to an inverting input terminal of an amplifier via a resistor. The amplifier produces a compensation current in a tilt compensation coil. The voltage at the inverting input terminal is maintained constant in closed loop operation. The constant voltage produces a magnitude of a collector current in the transistor that is unaffected by the duty cycle of the pulse-width modulated signal. The compensation current thereby varies linearly with the duty cycle.

REFERENCES:
patent: 4318036 (1982-03-01), Bart et al.
patent: 4752722 (1988-06-01), Erratico et al.
patent: 5015915 (1991-05-01), Hartmann et al.
patent: 5170094 (1992-12-01), Giannantonio et al.
SGS-Thomson Microelectronics, ST63140, ST63142, ST63126, ST63156--8-Bit HCMOS MCUs For TV Frequency & Voltage Synthesis With OSD, pp. 191-256, Oct. 1993.

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