PCB Design Preeti Mulage 03/17/2010

Chip Connections Six Plane PCB Four Power Planes Analog IO VDD Digital IO VDD Core VDD GND Two for routing Inputs and outputs from the pads are at 2.5V Inputs and outputs from the FPGA are at 2.5V/3.3V

FPGA Connections iBOB (used by Prof. Dejan’s Students)

Level Converters Outputs from the FPGA at 3.3V are converted to 2.5V using resistor dividers Outputs from the chip at 2.5V are converted to 3.3 V using a comparator Vref is generated using a Voltage Regulator

Voltage Regulators – LT3026 Input Voltage Range: 1.14V to 3.5V Adjustable Output Range: 0.4V to 2.6V Output Current: Upto 1.5A To be used to generate: Analog IO VDD (2.5V) Digital IO VDD (2.5V) VDD (1.2V) IBIAS_L & IBIAS_R VB & VBR

Components Needed Voltage Regulators Capacitors (for the regulator and for de-coupling caps) Resistors & Potentiometer Test Points SMA Connectors Jumpers One 20by2 Header