Front End - GE LOGIQ P3 PRO Service Manual

GE
D 5308917-100, R
IRECTION
5-1-4

Front End

FPC
128
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 (LOGIQ P3 Front Processor): Convert the analog echo signal to digital.
• TX64 (LOGIQ P3 Transmission Board):This has 64 channel bipolar drivers.
PROPRIETARY TO GE
8
EVISION
TX64
Pulser TPG2
x64 x4
SRAM
64
HV
LV,HV
MUX
power
RX64
T/R
x64
10x64
VCA8616 ADS5121
x8 x8
CW x20
Chapter 5 Components and Functions (Theory)
TX LV
USC
CTRL
power
Bus
FPGA
CHA
COM
SD
RAM
RX
CTRL
FPGA
SRAM
OQX2
Delay
x4
Line
Figure 5-3 The Front End
LOGIQ P3 S
ERVICE
TMST
Local
Bus
FPGA SH4
32bits
w/PC I
USC
SDRAM
PCI
(32MB )
DSP
FIFO
EMIFB EMIFA
16bits 64bits
SDRAM
(32MB )
CWD
ADC
x2
Gain
Mixer BPF
M
ANUAL
5-5