Video circuit including a digital-to-analog converter in the monitor which converts the digital data to analog currents before conversion to analog voltages

A system for processing digital video data to be displayed comprising:

• means for converting said digital video data into analog current data;
• means for converting said analog current data into first analog voltage data including:
• (A) a transistor having power terminals connected in series with said digital-to-current converting means, the base of said transistor being biased by a constant voltage, and (B) a forward biased diode connected in series with said transistor and said digital-to-current converting means;
• means for converting said first analog voltage data into second analog voltage data, said voltage-to-voltage converting means having an output impedance less than said current-to-first-voltage converting means and including:
• (1) an NPN transistor having a base connected to the anode of said diode, a collector adapted for connection to a first voltage source and an emitter connected to said displaying means, and (2) a PNP transistor having a base connected to the cathode of said diode, a collector adapted for connection to another voltage source and an emitter coupled to said emitter of said NPN transistor;
• and
• means for displaying said analog voltage data.