Patent ID: 6512412
Filing Date: 2003-01-28
Classification: H03F

Abstract:
An integrated circuit voltage regulator comprising:an amplifier having a first input coupled to receive an input voltage, a second input, and an output node having an output voltage, wherein the input voltage decreases as temperature increases and increases as temperature decreases; and a gain adjust circuit connected to the amplifier for adjusting a gain of the amplifier, the gain adjust circuit including a nonlinear device and a linear device coupled in series; wherein the linear device is a resistor having a first terminal and a second terminal; wherein the nonlinear device is a transistor including a gate, a drain and a source, one of the source and the drain of the transistor being connected to the first terminal of the resistor, the other of the source and the drain of the transistor being connected to the output node of the amplifier circuit, the gate being connected to ground; wherein the first terminal of the resistor is connected to the second input of the amplifier; and wherein the nonlinear device defines a first temperature-dependent resistance, wherein the linear device defines a second temperature-dependent resistance, the first temperature-dependent resistance changes at a greater rate than the second temperature-dependent resistance changes whereby the temperature effect of the input voltage is minimized by the gain adjust circuit when producing the output voltage.