Roughly one month after launching its first litigation campaign, Endpoint IP LLC affiliate Aido LLC has initiated a second, this time suing ON Semiconductor (1:19-cv-01110) and STMicroelectronics (1:19-cv-01111) over a patent generally related to pulse width modulated (PWM) amplifiers. The new complaints target provision of certain switch amplifiers, including the NCP2820 Series 2.65 W Filterless Class-D Audio Power Amplifier and TDA7491HV, respectively. Like the video processing patents that Aido asserted against Panasonic last month, the patent asserted here was received as part of a set of December 2018 assignments from Intellectual Ventures LLC (IV) that saw nearly 20 assets transferred to Aido.