US 11,754,599 B2
Precision dynamic range expansion for current measurement
Andrew Joseph Thomas, Arlington, MA (US); Joseph L. Sousa, Billerica, MA (US); Micah Galletta O'Halloran, Andover, MA (US); and Alex Robert Sloboda, Andover, MA (US)
Assigned to Analog Devices, Inc., Wilmington, MA (US)
Filed by Analog Devices, Inc., Wilmington, MA (US)
Filed on Jul. 15, 2021, as Appl. No. 17/376,850.
Prior Publication US 2023/0013695 A1, Jan. 19, 2023
Int. Cl. G01R 19/00 (2006.01); G01R 19/22 (2006.01); G01R 19/165 (2006.01)
CPC G01R 19/0092 (2013.01) [G01R 19/16523 (2013.01); G01R 19/22 (2013.01); H03F 2200/222 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A measurement circuit to measure a current signal, the measurement circuit comprising:
an input terminal to receive the current signal;
a first circuit branch coupled to the first terminal and including one or more circuit elements to receive a portion of the current signal, and at least a second circuit branch coupled to the first terminal and including one or more additional circuit elements to receive another portion of the current signal;
a nonlinear circuit element coupling the first circuit branch to the second circuit branch;
a quantization circuit configured to produce an input current measurement of current in the first and second circuit branches, and to include current in the second circuit branch in the input current measurement according to a magnitude of the input current signal; and
wherein the nonlinear circuit element includes a switch circuit and a comparator circuit, and the comparator circuit is configured to activate the switch circuit according to the magnitude of the input signal.