4-4 Product Principle
4.2.2 CW Board
Front-end
analog
motherboard
Probe board
Low
pass
filter
ADC
Q channel
I channel
Low-
pass
filter
ADC
LNA
Demodulati
on circuit
LNA
Signal processing board
Pencil probe
CW pulse
transmitting
circuit
Board-to-board connect socket
Board-to-board
connect socket
Board-to-board
connect socket
Digital echo
Control signal
A+12V/A-12V/A+19V/A+5V7/A-
5V7/A+4V/A+3V3/A+2V5/A+1V8
Clock
CW board
Demodulati
on circuit
Adder
(multiplex
composition )
Adder
(multiplex
composition )
AD collection after
demodulation
AD collection after
demodulation
Front end
power board
Receiving
board
FPGA
Communication motherboard
Board-to-board connecting socket
Fig 4-4 Schematic Diagram of CW Board
Function (Only phased array probe and pencil probe are supported):
 Realizing transmitting, receiving and beam forming of CW signal;
 Parameter control and mode switching in CW mode;
 Data output by beam former are output to DSP board, and then
upload to CPU module for CW image processing via the upload logic chip.
 The system can communicate with the CW board via the communication control bus.
4.2.3 Transmission Board
Communi
cation
mother-
board
High-
voltage
pulse
output
circuit
Drive
circuit
Transmitting
control
FPGA
Transmission board
64-channel
transmitting
Communication
control bus
Scanner time
sequence
Clock
4-channel
PHV
A+12V/A-12V
/A+4V2/A+3V3
/A+1V8
Board-to-board
connect socket
Front
-end
analog
mother
board
Board-to-board
connect socket
Fig 4-5 Schematic Diagram of Transmission Board
Hardware structure of the transmission board is shown as the figure above. Realize 128-channel
transmission pulse. For 192/256-elemented probe, the high voltage switching is realized in the
housing of the probe. There are two transmission boards: board A and board B, each board takes
charge of 64-channel transmission pulse. Board A and board B are the same, so both of them are
named transmission board. Only difference is the position.
Function:
 Generate 64-channel transmission waveform according to the scanning sequence and
control parameter.
 The 64-channel transmission waveforms are drove into 64-channel high-voltage
transmission pulses by the drive circuit.
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