Patent ID: 6861872

Claim:
A voltage down converter for a semiconductor memory device to convert an external voltage to a lower value internal voltage for the device, comprising: a voltage generator for producing a reference voltage corresponding to the value of the internal voltage; a comparator having opposite polarity inputs for producing an output control signal; a pull up device operating from the external voltage and receiving the control signal from said comparator to produce the internal voltage as an output; and a source follower between said reference voltage generator and said comparator, said source follower having two sections having cross-coupled inputs each of which inputs respectively receives the internal reference voltage and the internal voltage, the voltage outputs of said two sections moving in opposite directions and the voltage output of each section applied as an input to one of the two inputs of said comparator; wherein each section of said source follower includes first and second transistors, said reference voltage signal applied to one of said first and second transistors and said internal voltage applied to the other of said first and second transistor, a third transistor connected to said first transistor as a current mirror and a fourth transistor connected to said second transistor as a current mirror, the output voltage of the section appearing at the juncture of said second and fourth transistors.