GE HEALTHCARE
DIRECTION FC091194, REVISION 11 VIVID 7 SERVICE MANUAL
5 - 12 Section 5-3 - a Front-End Processor (FEP)
5-3-9-5 Signal Control
• The Front-End Controller (FEC) board (FEP1) or the Radio Frequency Interface (RFI) board (FEP2)
controls the transmitter and receiver boards. FEC/RFI loads all parameters to the TX and Beam
Former RAMs, it reads the probe identification, selects probe connector on Relay board and
controls the high voltage multiplexer in linear and convex probes.
In addition the FEC/RFI generates:
- the transmit trigger pulse for TX
- a receive synchronization pulse (SYNC_L) used by Beam Formers and RF & Tissue
Processor
- a differential ATGC voltage used by RX
- global 40 MHz system clocks and reset pulse (SRES).
Figure 5-8 The Ultrasound Transmitter and Receiver Control Signals
RELAY
BOARD
RX128
TX128
FRONT-END CONTROLLER
(Units with FEP1)
RFI BOARD
(Units with FEP2
PROBES
DOPPLER PROBE
DIGITIZED RECEIVED
ULTRASOUND SIGNALS TO:
- RFT BOARD
(UNITS WITH FEP1)
- RFI BOARD
(UNITS WITH FEP2)
XD_BUS
BF64
FE_BUS
T/R
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