rick tan

Responsible for schematic entry of switching power supplies for a low power handheld device. Includes floorplanning of system IO ports and components into a standardized PC-ATX form factor.

* Responsible for schematic entry of Callista supervisor board, includes clocking, core switching ASIC, * uplink PHYs, housekeeping CPU, switching power supplies and power supply sequencing. Entered constraints. * Worked on power budget estimates for correct sizing of on-board power supplies. Bring-up of board, * characterization of power subsystems, characterization of clocking. Debug of board issues. * Prototyped flow control mechanism and found solution for signal integrity issue. * Interfaced with manufacturing and diagnostic groups to resolve board issues.

* Responsible for Concept-HDL schematic used in the PowerMac G5. * Board is a high speed board using IBM processors at 250MHz FSB, 400MHz DDR, 133MHz PCI-X. * Investigated proper layer stackup for high speed bus routes, and their corresponding trace * impedance/widths. * Oversaw correct layout of PCB, proper routing of busses and component placements to minimize * plane splits. * Characterized and debugged boards, margin for crystal startup, eliminating board leakage, power supply * operation, both in the lab and out in the factory floor during prototype builds. * Generated netlists and BOMs for use of other groups in layout and manufacturing * Processor Module design * Responsible for Concept-SCALD schematic used in the PowerMac G4. * Board is a high speed board with signals in the 250MHz range of operation. * Simulation and timing analysis were important to the correct implementation of this part of the design. * Board also included a switching power supply designed for a 20 watt load.