GE Vivid 7 Service Manual page 358

GE H
EALTHCARE
D FC091194, R
IRECTION EVISION
5-3-9-5 Signal Control
DOPPLER PROBE
PROBES
Figure 5-8 The Ultrasound Transmitter and Receiver Control Signals
• 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:
-
-
-
-
5 - 12
11
RELAY
BOARD
XD_BUS
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).
Section 5-3 - a Front-End Processor (FEP)
BF64
RX128
T/R
FE_BUS
TX128
V 7 S M
IVID ERVICE ANUAL
DIGITIZED RECEIVED
ULTRASOUND SIGNALS TO:
- RFT BOARD
(UNITS WITH FEP1)
- RFI BOARD
(UNITS WITH FEP2)
FRONT-END CONTROLLER
(Units with FEP1)
RFI BOARD
(Units with FEP2