Patent ID: 7248098

Claim:
An apparatus for providing a temperature compensated reference signal, comprising: a band-gap cell that is arranged to provide a first signal that has a first temperature response profile, wherein the band-gap cell comprises a first bipolar device, a second bipolar device, a first resistor that is coupled between a first sense node and the first bipolar device, a second resistor that is coupled between the first sense node and a common node, a third resistor that is coupled between the common node and the second bipolar device at a second sense node, and an error amplifier that is responsive to signals from the first sense node and the second sense node, wherein a resistor circuit is coupled between an output node of the error amplifier and the common node; a PTAT circuit that is arranged to selectively provide a second signal that has a second temperature response profile to the common node when active; a feedback circuit that is arranged to selectively activate the PTAT circuit in response to an output from the band-gap cell, wherein the output of the band-gap cell corresponds to the output node of the error amplifier; and the resistor circuit, that is coupled between the output from the band-gap cell and the common node, is arranged in cooperation with the band-gap cell and the PTAT circuit to generate the temperature compensated reference signal at the common node as a combination of the first signal and the second signal such that the temperature compensated reference signal has a third temperature response profile that is determined by combination of the first temperature response profile and the second temperature response profile.