Patent ID: 9035641
Filing Date: 2015-05-19
Classification: G05F,H01F

Abstract:
1. A startup circuit for a bandgap reference circuit, comprising: a pull down resistor coupled to a feedback circuit of the bandgap reference circuit, wherein the pull down resistor prevents a closed loop condition within the feedback circuit, the pull down resistor receives a first current mirrored from a reference current output from an output reference circuit of the bandgap reference circuit, the first current passes through the pull down resistor, and the pull down resister outputs a first voltage based on the first current; a pull up resistor module coupled to the pull down resistor, wherein the pull up resistor module amplifies the first voltage outputted from the pull down resistor and outputs a second voltage; and a pull down transistor coupled to the pull up resistor module, wherein, based on the second voltage, the pull down transistor transitions a logic signal that operates to open a gate of at least one transistor within the feedback circuit thereby initiating current flow through the at least one transistor of the feedback circuit.