Circuit for generating a process-independent current

Details Circuit for generating a process-independent current Circuit for generating a process-independent current

2006-02-14

2006-02-14

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Combined cathode ray tube and circuit element structure

C348S180000, C348S380000

Reexamination Certificate

active

06998782

ABSTRACT:
Based, in part, on an input video signal, an autobias circuit generates red, green, and blue channel video signals, which are received by external drivers to drive cathodes in a CRT. The autobias circuit also provides gain and bias control signals based on a sense current. The external drivers generate the sense current such that the sense current is proportional to the sum of the beam currents flowing from the cathodes. The sense current has an error caused by current flowing through external recharge resistors. A correction current (Ivideo) is subtracted from the sense current to compensate. The correction current is generated according to the equation Ivideo=(Vs/Rkin)*[(Vref/Rext)/(Vref/Rin)], where Vkin and Rin are matched internal monolithic resistors, Rext is the resistance of another external resistor that is matched to the external recharge resistors, and Vs is the sum of the red, green, and blue channel video signals.

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patent: 6294876 (2001-09-01), Ando et al.
patent: 6686710 (2004-02-01), Guan et al.

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