Patent ID: 11960311
Assignee: MEDTRONIC MINIMED, INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 14:
15. A linear voltage regulator system comprising:
an input voltage terminal for a regulator input voltage and configured to receive an input current;
an output voltage terminal for a regulator output voltage and configured to output an output current, wherein the output current is substantially equal to the input current;
a reference voltage terminal for a reference voltage;
a series pass field-effect transistor coupled between the input voltage terminal and the output voltage terminal;
a buffer amplifier comprising an input node configured to receive an input current at least two orders of magnitude less than a magnitude of the output current of the output voltage terminal; and
an error amplifier comprising an error output coupled to the transistor, a positive error input directly connected to the output voltage terminal to have the same voltage as at the output voltage terminal and to receive the regulator output voltage, and a negative error input coupled to the reference voltage terminal to receive the reference voltage, the error amplifier powered by an independent voltage supply that is isolated from the input voltage terminal, wherein output of the error amplifier is based on a difference between the reference voltage and the regulator output voltage, and wherein the output of the error amplifier controls impedance of the transistor to adjust the regulator output voltage at the output voltage terminal.