Constant-current generation circuit, digital/analog conversion circuit, and image processor

Abstract

A constant-current generating circuit for implementing high-precision analog output is disclosed in an image processing apparatus that includes a digital-to-analog conversion circuit (DAC) for converting a digital data image signal into analog data. For stably generating a constant current, current-generating transistors formed of basic-capacitance transistors are regularly disposed in the form of a SEA OF GATES (SOG). With this arrangement, uniform pattern formation based on the basic-capacitance transistors can be achieved, so that all the factors of the constant-current generating circuit, such as the drain resistance, the source resistance, etc., can be made uniform, thereby stably generating a constant current. The whole constant-current generating circuit group forming the digital-to-analog conversion circuit becomes totally independent due to the above-described arrangement, thereby stabilizing a constant current within one channel.

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