Patent ID: 7202654

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