GE H
EALTHCARE
D
IRECTION
FC091194, R
EVISION
11
V
IVID
7 S
ERVICE
M
ANUAL
5 - 10
Section 5-3 - a Front-End Processor (FEP)
5-3-9-2
Transmitter Signal Path - Units With Two TX Board
•
The Radio Frequency Interface board (RFI) loads scan parameters via the FE_BUS into local RAM
on the TX boards and on the BF boards.
The scan parameters includes probe dependant steering and focusing delay for a certain scan
pattern. Thus, when the Radio Frequency Interface board goes through a scan sequence, it loads
the proper contents of the RAM into the Transmitter Pulse Generator (TPG), then issues a transmit
trigger pulse (TXTRIG_L) for the transmitter and a receive synchronization pulse (SYNC_L) for the
Beam Formers.
By firing the transmit pulses from the different elements at certain repeated time intervals and with
different delays, the ultrasound beam can be steered in desired directions to obtain the selected
scan patterns (e.g. 2D, 2D Flow etc.).
•
The ultrasound transmit bursts are generated on the TX boards, initiated by the transmit trigger
pulse (TXTRIG_L). The transmit trigger starts the Transmit Pulse Generators (TPG) on the TX
boards, each generating 16 transmit pulses with different delays. The transmit pulses are then
routed to separate transmit “amplifiers” fed with voltage HV1 and HV2. The voltages HV1 and HV2
are controlled by the Acoustic Power Control software.
•
The transmit pulses are routed over the Transducer Bus Board (XDBUS), located on the front side
of the TX and RX boards, to the Relay board, where they are fed to the selected probe.
Figure 5-6 The Ultrasound Transmitter with two TX boards
RELAY
BOARD
RX128
RFI BOARD
PROBES
DOPPLER PROBE
DIGITIZED RECEIVED
ULTRASOUND SIGNALS TO:
- RFI BOARD
XD_BUS
BF64
FE_BUS
T/R
TX128
TX128
Summary of Contents for Vivid 7
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