A self tuning system for on-die terminators in current mode off-chip signaling

Abstract

A system for self tuning of on-die terminators in current mode off-chip signaling is presented. The proposed method is based on an algorithm that uses the sign of the impedance matching error and the sign of the coupling branch current to perform the self tuning operation. The circuit implementation of the system is described and computer simulations at the transistor level are presented for process, temperature and load impedance variations.

Impedance Matching in VLSI Systems

“…Another important operation for the system is the integration, which is implemented by means of a charge pump and a filter (Lopez et al, 2009). The current I CH of the pump is directly related with the parameter α, as a consequence, the matching speed is established by this current.…”