US 9,813,067 B2
Clock signal and supply voltage variation tracking
Yantao Ma, Boise, ID (US); and Tyler Gomm, Boise, ID (US)
Assigned to Micron Technology, Inc., Boise, ID (US)
Filed by Micron Technology, Inc., Boise, ID (US)
Filed on Jun. 10, 2015, as Appl. No. 14/736,005.
Prior Publication US 2016/0365860 A1, Dec. 15, 2016
Int. Cl. H03L 7/08 (2006.01); H03K 5/156 (2006.01); H03L 7/081 (2006.01); H03L 7/089 (2006.01)
CPC H03L 7/0802 (2013.01) [H03K 5/1565 (2013.01); H03L 7/0812 (2013.01); H03L 7/0891 (2013.01)] 22 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a clock generation circuit configured to generate a first signal for a first time period and a second signal for a second time period;
a charge pump circuit coupled to the clock generation circuit and configured to generate a first voltage and a second voltage based, at least in part, on the first time period and the second time period; and
a comparison circuit coupled to the charge pump circuit, the comparison circuit comprising a sense amplifier configured to proportionally amplify the first voltage and the second voltage and configured to compare a difference between the first voltage and the second voltage with a threshold value and generate an active tracking enablement signal in response to determining that the difference between the first and second voltages exceeds the threshold value.