GE HEALTHCARE
DIRECTION FC091194, REVISION 11 VIVID 7 SERVICE MANUAL
Chapter 5 - Components and Functions (Theory) 5 - 29
5-3-14 Receiver Board, RX-128
5-3-14-1 General Description
5-3-14-2 Signals From Active Probe
• The RX-128 Board has 128 identical receive channels (XD1-XD128).
• The signal in each channel is fed via a Transmit/Receive (T/R) switch to a preamplifier.
• From the preamplifier the signal goes to a Time Controlled Gain (TGC) amplifier used to equalize
the signal strength from the near field, the mid field and the far field.
• The output channels (RX1 - RX128) are then output via the backplane to the Beamformer boards.
Figure 5-21 RX128 Block Diagram
DemodulatorMux
Analog
Beamformer
T/R
T/R
Relay
Prog
LP
Filter
Pedof
(CW mode)
(PW mode)
I
Q
12 Bit ADC
MLA0
MLA1
Rx[1:128]
Preamp
+
-
Buffer & Level
Test Signals
TGC Ctrl
XD[1:128]
Enable
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