View source for Bias Card Rev F0 to Rev F1/F2 Changes

== ECO-055 ==
*Module Name: Bias Card
*Module Number: ELE_C583_101
*Change From: 	Rev. F0		Change To: 	Rev. F1
*Change Request #: ECO-055		
* Date:Nov. 5, 2010, Requested by:GPD	

=== Problem Description===
To lower power consumption of Bias Cards, removed L12 and L13 in order to disable the low noise bias circuitry. Regulators U34 and U35 generating nets p5VA_LN and n5VA_LN disabled.  Saves ~240mA on pVa supply, and ~195mA on nVa supply or a total of ~2.7W power saving.

=== Change Description ===
# Remove L12 and L13 (PN: 000308 IND, Supplier Newark 72K6792, Fair-Rite 2743019447 Ferrite Bead Z47)
# Relabel the card as Rev. F1

== ECO-058 ==
*Module Name: Bias Card
*Module Number: ELE_C583_101
*Change From: 	Rev. F1		Change To: 	Rev. F2
*Change Request #: ECO-058		
* Date:Feb. 28, 2011, Requested by:TF

=== Problem Description ===
To save manufacturing cost, we are replacing 2x267Ohm 10ppm resistors (long lead time) with 1x133Ohm 10ppm resistor.
=== Change Description ===
# Change R62, R63 to DNP on all 12 channels. (total of 24 resistors)
# Change R52, R53 to 133Ohm 10ppm (PN=002365) on all channels (total of 24 resistors)
# Relabel the card as Rev. F2

[[Category:Bias Card]]