Patent ID: 6448992
Filing Date: 2002-09-10
Classification: B41J,H01L

Abstract:
Apparatus for providing a chosen level of power dissipation of a resistor, the resistance of the resistor changing upon change in temperature thereof, comprising:a shunt in series with the resistor; a first differential amplifier, voltage drop across the resistor being provided to first and second input terminals thereof; a second differential amplifier, voltage drop across the shunt being provided to first and second input terminals thereof; a voltage multiplier having first and second input terminals which are connected to the respective output terminals of the first and second differential amplifiers; a power operational amplifier, an output terminal of the voltage multiplier being connected to a first input terminal of the power operational amplifier; a second input terminal of the power operational amplifier provided for receiving a programming sequence voltage; an output terminal of the power operational amplifier being connected to the resistor for providing voltage thereto.