Patent ID: 9715245
Date: 2017-07-25
CPC Classifications: G05F

Claim:
1. A circuit for generating an output voltage that is substantially constant despite process, voltage, or temperature variation in the circuit, the circuit comprising: an error amplifier having a first input, a second input, and a single-ended output, wherein the first input is electrically connected to a reference voltage, and the second input is electrically connected to an output node of the circuit via a feedback resistor, the feedback resistor including a first terminal electrically connected to the output node and a second terminal electrically connected to the second input; a pass transistor including a control electrode electrically connected to the single-ended output of the error amplifier, a first electrode electrically connected to a power supply voltage, and a second electrode electrically connected to the output node of the circuit; a current source configured to generate a reference current that changes when a resistance of the feedback resistor changes; a first branch of a current mirror electrically connected to the current source, the reference current flowing through the first branch; and a second branch of the current mirror electrically connected to the second terminal of the feedback resistor, wherein an output current that flows through the second branch and between the first and second terminals of the feedback resistor is based on (i) the reference current flowing through the first branch, and (ii) a mirror ratio of the current mirror, wherein the output node provides an output voltage of the circuit, and the current source includes: