Title :
Feedforward active substrate noise cancelling technique using power supply di/dt detector
Author :
Nakura, Toru ; Ikeda, Makoto ; Asada, Kunihiro
Author_Institution :
Dept. of Electron. Eng., Tokyo Univ., Japan
Abstract :
This paper demonstrates a feedforward active substrate noise cancelling technique using a power supply di/dt detector. Since the substrate is tied to the ground line, the substrate noise is closely related to the ground bounce which is caused by di/dt when inductance is dominant on the ground line impedance. The active cancelling technique detects the di/dt of the power supply current and injects an anti-phase signal into the substrate so that the di/dt proportional substrate noise is cancelled out. 34% of the substrate noise reduction was achieved in a test circuit for the first trial. It is theoretically shown that the optimized canceller design will enhance the suppression ratio up to 56%.
Keywords :
integrated circuit design; integrated circuit noise; power supply circuits; substrates; anti-phase signal; di/dt detector; feedforward active substrate noise cancelling technique; ground line impedance; inductance; power supply; Active noise reduction; Circuit noise; Circuit testing; Current supplies; Detectors; Impedance; Inductance; Noise cancellation; Noise reduction; Power supplies;
Conference_Titel :
VLSI Circuits, 2005. Digest of Technical Papers. 2005 Symposium on
Print_ISBN :
4-900784-01-X
DOI :
10.1109/VLSIC.2005.1469387