Patent ID: 11921534
Assignee: FERROELECTRIC MEMORY GMBH
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A startup circuit for providing a startup voltage to a bandgap reference circuit that provides a predefined bandgap reference voltage, the startup circuit comprising:
a comparator circuit comprising a feedback terminal, a target voltage terminal, and a comparison output terminal, wherein the comparator circuit is configured to provide a comparison voltage at the comparison output terminal that indicates a feedback voltage value received from the bandgap reference circuit at the feedback terminal compared with a target voltage value received at the target voltage terminal,
wherein the target voltage value represents a startup condition of the bandgap reference circuit that provides a stable on-state of the bandgap reference circuit, wherein the target voltage value is less than the predefined bandgap reference voltage; and
a trimmer circuit configured to generate a target voltage having the target voltage value and provide the target voltage to the target voltage terminal of the comparator circuit;
a switch circuit connected between the comparator circuit and the bandgap reference circuit, the switch circuit comprising:
a switching input terminal connected to the comparison output terminal; and
a bandgap voltage output terminal connected to the bandgap reference circuit, wherein the switch circuit is configured to selectively provide the startup voltage at the bandgap voltage output terminal based on a comparison voltage value of the comparison voltage, wherein the switch circuit is configured to:
increase a value of the startup voltage in the case that the comparison voltage value indicates the feedback voltage value is less than the target voltage value; and
stop providing the startup voltage in the case that the comparison voltage value indicates the feedback voltage value is equal to or greater than the target voltage value.