US 9,810,723 B2
Charge pump based over-sampling ADC for current detection
Feng Pan, Fremont, CA (US); Jun Wang, San Jose, CA (US); Shankar Guhados, Fremont, CA (US); and Bo Lei, San Ramon, CA (US)
Assigned to SanDisk Technologies LLC, Plano, TX (US)
Filed by SanDisk Technologies LLC, Plano, TX (US)
Filed on Sep. 27, 2012, as Appl. No. 13/628,465.
Prior Publication US 2014/0084936 A1, Mar. 27, 2014
Int. Cl. G05F 1/10 (2006.01); G05F 3/02 (2006.01); G01R 19/00 (2006.01); G11C 29/02 (2006.01); G11C 29/12 (2006.01); G11C 29/50 (2006.01)
CPC G01R 19/0092 (2013.01) [G11C 29/025 (2013.01); G11C 2029/1202 (2013.01); G11C 2029/5006 (2013.01)] 30 Claims
OG exemplary drawing
 
1. A method, comprising:
supplying a component of an integrated circuit from a charge pump system, the charge pump system including a charge pump having an output connected to drive the component, and regulation circuitry connected to receive the output of the charge pump and regulate the charge pump by varying a frequency of an oscillator supplied to the charge pump;
while driving the component under regulation, determining a number of cycles of the oscillator supplied to the charge pump during an interval of a first duration in order to maintain the output of the charge pump under regulation;
comparing the determined number of cycles to a reference value; and
based upon the comparing, determining an amount of current being drawn by the component.