US 12,352,807 B2
Ultra-compact and micropower circuit to monitor process, voltage, and temperature with high accuracy
Alberto Grassi, Foothill Ranch, CA (US); Saurabh Surana, Irvine, CA (US); Ullas Singh, Irvine, CA (US); and Namik Kocaman, Irvine, CA (US)
Assigned to Avago Technologies International Sales Pte. Limited, Singapore (SG)
Filed by Avago Technologies International Sales Pte. Limited, Singapore (SG)
Filed on Apr. 3, 2023, as Appl. No. 18/130,332.
Prior Publication US 2024/0329112 A1, Oct. 3, 2024
Int. Cl. G01R 31/28 (2006.01); H03K 17/687 (2006.01)
CPC G01R 31/2831 (2013.01) [G01R 31/2837 (2013.01); H03K 17/687 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A device, comprising:
a first circuit configured to generate:
a first current associated with a voltage in a region of a semiconductor substrate;
a second current associated with a temperature in the region of the semiconductor substrate; and
a third current associated with a first process parameter in the region of the semiconductor substrate; and
a multiplexer configured to receive the first current, the second current, and the third current, wherein the multiplexer is configured to supply the first current, the second current, and the third current, one by one and periodically; and
a ring oscillator coupled to the multiplexer and configured to receive the first current, the second current, and the third current, one by one and periodically, from the multiplexer, wherein at each period of time one of the first current, the second current, or the third current is provided to the ring oscillator, and wherein the ring oscillator is configured to oscillate at a frequency based on a current received from the multiplexer.