US 12,093,069 B2
Low line-sensitivity and process-portable reference voltage generator circuit
Mohammad Reza Mahmoodi, Goleta, CA (US); and Martin Lueker-Boden, Fremont, CA (US)
Assigned to SANDISK TECHNOLOGIES LLC, Addison, TX (US)
Filed by SanDisk Technologies LLC, Addison, TX (US)
Filed on Sep. 6, 2022, as Appl. No. 17/903,306.
Prior Publication US 2024/0077903 A1, Mar. 7, 2024
Int. Cl. G05F 3/26 (2006.01); G05F 1/46 (2006.01)
CPC G05F 3/267 (2013.01) [G05F 1/468 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A reference voltage generator circuit comprising:
a current control circuit coupled to a first node and a second node and configured to feed a first current to the first node by mirroring a second current at the second node that is based on a supply voltage;
complimentary metal-on-semiconductor field-effect transistors (MOSFETs) including:
a first complimentary MOSFET connected to the first node and having a first threshold voltage, and
a second complimentary MOSFET connected to the second node and having a second threshold voltage that is greater than the first threshold voltage;
a voltage output node connected to the first and second complimentary MOSFETs and configured to output a voltage based on the first and second complimentary MOSFETs operating in respective saturation regions; and
a startup circuit connected to the second node and configured to remove a degenerate point by charging the second node to a non-zero current,
wherein the second complimentary MOSFET receives the second current responsive to waiting for a settling period after charging the second node to the non-zero current.