ACTIVE BYPASS FOR INHIBITING HIGH-FREQUENCY SUPPLY VOLTAGE VARIATIONS IN INTEGRATED CIRCUITS

摘要

An integrated circuit (10, 22) contains an active bypass (36) that inhibits high-frequency supply-voltage variations caused by interaction of the circuitry elements (28) with the parasitic inductances (LHE, LHP, LLP, and LLE) associated with the power supply lines (16H/24H/26H/32H and 16L/24L/26L/32L) for the circuit. The bypass centers around a transistor (QBP) coupled between the supply lines. An activation circuit (38) provides the transistor with a control signal (VC) to activate the transistor. A sensing capacitor (CS) provides a capacitive action between the transistor control electrode and one of the supply lines.