Service manual

GE MEDICAL SYSTEMS
D
IRECTION 2300749-100, REVISION 2LOGIQ
TM
3 SERVICE MANUAL
Chapter 5 5-19
5-6-1-5 Digital Beam Former
Overview
The DBF sub-system is the receiving Digital beam former.
The DBF sub-system is delay summing echo signals after pre-amplification and time controlled gain at
the RXB ASSY. Then, the DBF sub-system adds the delay sum data and transfers the results to the
FEC sub-system.
The block diagram is shown in the Figure above.
The DBF sub-system consists of delay summing part and its controller part.
Control Part
• Function Outline
- Interfaces with CPU through USC Bus.
- Generates receive timing.
- Controls OQCARD's operation.
- Controls delay data transfer from SRAM memories to OQCARD’s.
Figure 5-15 DBF Block Diagram
AAF & ADC DRV ADC
ADC
ADC
AAF & ADC DRV
AAF & ADC DRV
From RX Board
48
0
7
47
5V
Voltage
References
2V5325175
Oqcard
12
12
12
Oqcard
RF data to FEC
34
Clock
DRV
ECL
to TTL
To ADCs ( 24)
To Oqcard (6)
FPGA
B
U
F
SRAM
USC
BUS