Patent ID: 6433521
Filing Date: 2002-08-13
Classification: G11C,H04L

Abstract:
A source and sink voltage regulator used in an active terminator of a bus, said regulator comprising:a voltage-regulated terminal for providing a regulated output voltage; a first operational amplifier, a non-inverting input terminal of said first operational amplifier coupled to a reference voltage; a second operational amplifier, an inverting input terminal of said second operational amplifier coupled to said reference voltage; a first transistor, a control gate of said first transistor coupled to an output terminal of said first operational amplifier, a source of said first transistor coupled to said voltage regulated terminal and an inverting input terminal of said first operational amplifier via a feedback network, and a stable circuit of sourcing current provided by a combination of said first transistor and said first operational amplifier; and a second transistor which belongs to a type the same as said first transistor, a control gate of said second transistor coupled to an output terminal of said second operational amplifier, a drain of said second transistor coupled to said voltage regulated terminal and a non-inverting input terminal of said second operational amplifier via said feedback network, and a stable circuit of sinking current provided by a combination of said second transistor and said second operational amplifier.