On-Chip Switched Decoupling Capacitor for Fast Voltage Hopping of DVS Systems

抄録

This paper presents a decoupling capacitance boosting method for the resonant supply noise reduction by fast voltage hopping of DVS systems. The proposed method utilizes a foot transistor as a switch between a conventional decoupling capacitor (decap) and GND. The switching controls of the foot transistor depending on the supply noise states achieve an effective noise reduction as well as fast settling time compared with the conventional passive decaps. The measurement results of a test chip fabricated in a 0.18µm CMOS technology show 12X boost of effective decap value, and 65.8% supply noise reduction with 96% settling time improvement.