Patent ID: 11875873
Assignee: YANGTZE MEMORY TECHNOLOGIES CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 6:
7. A circuit for multi-mode ZQ calibration, comprising:
a first group of pull-up drivers connected to a first external resistor that is coupled to a ground voltage at a first resistor input;
a first group of pull-down drivers connected to a second external resistor that is coupled to a supply voltage at a second resistor input;
a first comparator connected to the first resistor input, the second resistor input, and to a plurality of selectable voltages;
a second group of pull-up drivers connected to a second group of pull-down drivers, respectively, at a plurality of middle points;
a second comparator connected to the plurality of middle points and to the plurality of selectable voltages;
a logic pull-up code generator connected to the first comparator and the second comparator and configured to generate pull-up codes to calibrate the first group of pull-up drivers and the second group of pull-up drivers; and
a logic pull-up code generator connected to the first comparator and the second comparator and configured to generate pull-down codes to calibrate the first group of pull-down drivers and the second group of pull-down drivers.