Patent ID: 6204720
Filing Date: 2001-03-20
Classification: G05F,Y10S

Abstract:
An integrated circuit including a plurality of power supply units for driving a load terminal, each power supply unit comprising:a power transistor having a source to drain path connecting a first power supply terminal (V.sub.DD) to the load terminal, and having a gate;a variable voltage source having a first voltage supply terminal coupled to the gate of the power transistor, and having a voltage control terminal;a first diode having a p-n junction with a p terminal coupled by a current source to the first power supply terminal (V.sub.DD) and an n terminal coupled to a second power supply terminal (V.sub.SS);a first amplifier having a noninverting terminal coupled to the p terminal of the first diode, an inverting terminal coupled to a bus line, and an output, wherein a voltage difference from the noninverting terminal to the inverting terminal of the first amplifier is coupled to the voltage control input of the variable voltage source; anda second diode having a p-n junction with a p terminal coupled to the inverting input of the first amplifier and an n terminal coupled to the output of the first amplifier.