	US 12,253,550 B2
	Phase-change material switches
Jaroslaw Adamski, Steamwood, IL (US); Jeffrey A. Dykstra, Woodstock, IL (US); and Edward Nicholas Comfoltey, San Diego, CA (US)
Assigned to Murata Manufacturing Co., Ltd., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Kyoto (JP)
Filed on Mar. 21, 2023, as Appl. No. 18/187,403.
Application 18/187,403 is a continuation of application No. 17/743,924, filed on May 13, 2022.
Application 18/187,403 is a continuation of application No. 17/351,651, filed on Jun. 18, 2021, granted, now 11,624,762.
Claims priority of provisional application 63/212,298, filed on Jun. 18, 2021.
Prior Publication US 2023/0288462 A1, Sep. 14, 2023
Int. Cl. G01R 27/08 (2006.01); H10B 63/10 (2023.01); H10N 70/00 (2023.01)

CPC G01R 27/08 (2013.01) [H10B 63/10 (2023.02); H10N 70/861 (2023.02)]

20 Claims

1. A circuit for countering variations in resistance of a resistive heater of a phase change material (PCM) switch, including:

(a) a resistivity sensor for measuring a resistance R_{H_M}of the resistive heater;

(b) a processor, coupled to the resistivity sensor, for calculating scaled current values as a function of the measured resistance R_{H_M}and a reference resistance R_{H_REF}, for calculating an adjusted electrical pulse profile based on the calculated scaled current values, and for outputting signals indicative of the adjusted electrical pulse profile; and

(c) a heater controller and driver, coupled to the processor and the resistive heater, for applying the adjusted electrical pulse profile to the resistive heater.