Presenter: Curtis Grens April 3, 2003 2 Highlights of the Last Week Connectorized PD on current board replaced with unconnectorized PD Second board constructed, uses connectorized PD Baseline and attenuation tests repeated on second board. 3 Attenuation Tests Discouraging RX results with 5dB attenuation. PD sensitivity? Damaged TIA? Cross-talk? Other? Board 1 RX: PRBS7 at 0dBBoard 1 RX: PRBS7 at 5dB 4 Board number 2. Board number 2 (right): Same design, same PD- new construction, new TIA. Board number 1 (left): Unconnectorized PD installed. 5 Continued Testing Successful baseline test results for Board 2. Board 2 RX: PRBS7 at 0dB (with TX on)Board 2 TX: PRBS7 at 0dB 6 Continued Testing Improved 5dB attenuation results for Board 2: (RX shows improved attenuated performance with TX operating!!) Board 2 RX: PRBS7 at 5dB (TX unconnected) Board 2 RX: PRBS7 at 5dB (TX CONNECTED) Based on [left] figure, damaged TIA ruled out. PD? Cross- talk? Board number 1: still awaiting functional XYZ stage. Board 2 Loopback: PRBS7 at 5dB 7 8 Plans for the Coming Week Further explore source of poor attenuated performance. Perform attenuation tests on Board 1 with the XYZ stage- determine if the superior unconnectorized PD improves attenuated performance. Determine if/which portions of the design could be modified/improved for finalized design.