Patent ID: 8324876

Claim:
A low dropout (LDO) voltage regulator with unconditional frequency compensation comprising: an operational amplifier having two-stages, the operational amplifier comprising a first stage amplifier and a second stage amplifier receiving output from the first stage amplifier, the first stage amplifier comprising: a first input transistors a second input transistors a first diode-connected transistor coupled to the first input transistor, wherein a drain of the first input transistor coupled to the first diode-connected transistors; a second diode-connected transistor coupled to the second input transistor, wherein a drain of the second input transistor coupled to the second diode-connected transistors and a first transistor connected in parallel to the first diode-connected transistor and a second transistor connected in parallel to the second diode-connected transistor, wherein the first and second transistors increase a gain of the first stage amplifier; and a compensation capacitance input between the first stage amplifier and the second stage amplifier, wherein a compensation voltage on the compensation capacitance input adjusts a current through the first diode-connected transistor coupled to the first input transistor and a gain of the first stage amplifier, wherein the compensation voltage comprises an output voltage at an output node of the LDO voltage regulator.