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GE M
S
EDICAL
YSTEMS
D
2300164-100, R
IRECTION
5-4-4
Beamformer Board (BF)
5-4-4-1
General Description
The Beamformer Board (BF Board) contains the A/D converter, the ASIC (called the Focuser [FOC])
and a Beam Adder (BA). The BF Board accepts input channels and converts each channel to digital
bytes.
The system requires one BF Board which scans 64 channels.
The digitized samples at the ADC output are input to the FOCs, whose outputs go to a BA. The output
of the BA (BA Level 2) is the sum of the input channels, which is added together with the output from
the other BA Level 2, as shown in
These ASICs will add all the input and output channels, with appropriate delay, to give optimal receive
focusing and beam steering as a function of time. All focusing and steering parameters for a scan are
stored in VRAM on the BF Board. The output of the BF Board is a high-frequency digital Word update.
This output can be added to any successive board, if more channels are required.
BF Calibration:
•
voltage for the ADC on the BF Board. If the BF Board is replaced, the calibration procedure has to
be performed, as described in
BF Board Location:
•
the left side.
5-4-4-2
Description of Operation
RX
N
AD C
RX
N+1
AD C
RX
N+2
AD C
RX
N+3
AD C
(4 of 64)
From prev. board
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
7
EVISION
Figure 5-14
The system has a calibration procedure for the BF Board, which sets the offset
Beamformer Calibration
The BF Board can be placed in the Front End Crate, in the third slot from
12
0
FOC 2
1
(1 of 16)
21
MLA0
21
MLA1
Figure 5-14 Beamformer Board (32 Channel) Block Diagram
Chapter 5 - Components and Function (Theory)
V
™ 3 P
IVID
on page 5-19.
on page 6 - 17.
BA2
BA2
SRAM &
Bus-
Contro l
Ifc
BA2
BA2
/V
™ 3 S
M
RO
IVID
ERVICE
ANUAL
21
MLA0
To next
board
FE bus
21
MLA1
To next
board
5-19
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