CPES researchers receive 4th U.S. patent in 2009

Congratulations to CPES researchers for 4th U.S. patent awarded in 2009!  

Hybrid Filter for High Slew Rate Output Current Application
by Ming Xu, Yuancheng Ren, Fred C. Lee, Andrew P. Schmit
U.S. Patent: 7,560,912
Issued:  July 14, 2009

Patent Abstract:  An active linear regulator circuit in parallel with a filter capacitor of a switching voltage regulator injects current to a load only when the switching regulator and capacitor cannot supply adequate current to follow high frequency load transients in a manner which is compatible with adaptive voltage positioning (AVP) requirements, control of current injection and determination of the insufficiency of current from the switching regulator and capacitors is achieved by impedance matching of the linear regulator to the switching regulator. The linear regulator thus operates at relatively low current and duty cycle to limit power dissipation therein. By matching impedances and increasing the bandwidth of the switching regulator, filter capacitor requirements can be reduced to the point of being met entirely by packaging and/or on-die capacitors which may be placed close to or at the point of load to reduce parasitic inductance, as can the linear regulator.

This patent application has been sponsored by CPES IPPF (Intellectual Property Protection Fund) - a unique IP access mechanism that provides extraordinary IP advantage to CPES Principal-level members.


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