GE Vivid P3, Руководство по обслуживанию

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GE H
EALTHCARE
PROPRIETARY TO GE
D
IRECTION
55344303-100, R
EVISION
6 V
IVID
P3 S
ERVICE
M
ANUAL
5-4 Section 5-1 - Overview
5-1-3 Front End
Figure 5-2 The Front End
The front end generates the strong transmit bursts, transmitted by the probes as ultrasound into the
body. It also receives weak ultrasound echoes from blood cells and body structure, amplifies the signals
and converts them to a 10bit digital signal.
The digital representation of the signal is presented to the mid processor section.
• PAM(PreAmplifier): The preamplifier amplifies 64 echo signals. The reception signals are sent to
ADC on RX64.
• RX64 (VIVID P3 Front Processor): Convert the analog echo signal to digital.
• TX64 (VIVID P3 Transmission Board):This has 64 channel bipolar drivers.
Local
Bus
32bits
P
robe C
on
ne
ctor
TX64 TMST
DSP
PCI
CHA
COM
FPC
128
HV
MUX
Pulser
x64
TPG2
x4
TX
CTRL
FPGA
SRAM
RX64
T/R
x64
VCA8616
x8
ADS5121
x8
OQX2
x4
RX
CTRL
FPGA
SRAM
64
10x64
USC
Bus
SD
RAM
SDRAM
(32MB )
EMIFA
64bits
EMIFB
16bits
FPGA SH4
w/PCI
SDRAM
(32MB )
FIFO
USC
CWD
CW x20
Delay
Line
Gain
Mixer BPF
ADC
x2
LV,HV
power
LV
power