Patent ID: 6236238
Filing Date: 2001-05-22
Classification: H03G,H03K

Abstract:
A buffer having a data input terminal and a data output terminal, the buffer receiving a data input signal on the data input terminal, and providing a data output signal on the data output terminal, the buffer comprising:current mirror means having a reference leg and two or more current mirror legs, selected current mirror legs having an enable terminal, the reference leg being coupled to the data input terminal of the buffer, and the two or more current mirror legs being coupled to the data output terminal of the buffer;the data input signal providing an input reference current to the reference leg;each of the current mirror legs providing an output current in the same direction as the other current mirror legs to the data output terminal with a magnitude that is proportional to the input reference current; andcontrol means coupled to the enable terminals of selected current mirror legs for enabling a first set of the current mirror legs to provide a desired output current to the data output terminal.