A high voltage regulator including a current mirror including a pair of
transistors, one of the transistors being connected to a node that
outputs an output voltage V.sub.out, a diode stack that includes a
plurality of serially connected transistors T.sub.0, T.sub.1, T.sub.2, .
. . T.sub.n, wherein the transistor T.sub.1 is connected to a node
n.sub.0, to which is connected another transistor T.sub.0 that receives
an input bias voltage V.sub.bias, and wherein a feedback voltage fb from
node n.sub.0 is fed to an input of the differential amplifier, the
differential amplifier receiving an input reference voltage V.sub.ref at
one of its other inputs, and is also connected to positive voltage supply
Vdd, the differential amplifier outputting to an NMOS transistor M, and
wherein the high voltage regulator has a large diode stack gain and lower
G.sub.DA*G.sub.NMOS*m, resulting in a generally constant feedback (loop)
gain G.sub.loop, wherein the loop gain is given by: Loop
Gain=G.sub.loop=G.sub.stack*G.sub.DA*G.sub.NMOS*m wherein m is the
ratio of the two currents I.sub.1 and I.sub.2, that is, I.sub.2=mI.sub.1,
G.sub.stack is the gain of the diode stack, G.sub.DA is the gain of the
differential amplifier and G.sub.NMOS is the gain of the NMOS transistor
M.