Chapter 5. Product Structure 5 - 19
• The CW Board connects to PSA Board to process CW Tx and CW Rx input/output
signals and relays power for PSA Board.
• The CW Board connects to Back Plane Board to relay CW I/Q signals, Master Clock
input and information from PSA.
• Pulser: It consists of 29 channels and it can run 29 element Probes.
• LNA: It amplifies the received ultrasound signal.
• ADC: It converts the amplified signal to digital data.
• FPGA and Clock Part generate system Clock 61.6Mhz used in the system.
• Sensing Part monitors the status of High Voltage and current used in the CW board.
▐ Specification
• Input noise: 3nV/SqRtHz
• Input Signal Level: ~250mVpp
• Usable frequency: 1.5~6MHz
• Input impedance: 1Kohm
• Gain: 60dB
• PRF: ~ 43KHz
• Number of Channel: TX/RX 29 channels each
• Transmit Delay Tab: 32.5MHz
• Receive Delay Tab: Min. 30ns, Max.100ns
• Power Noise: Less than 100nV/SqRtHz
▐ Operational Principles
TX Pulser
Pulse data provided by FPGA goes through latch and gets relayed to Tx Pulse (Max4811). It
uses PSA (Probe Select Assembly) to send to the Probe Element, thereby generating
ultrasonic waves.
Receive Channel
The Receive Channel serves the function of an Analog Digital Conversion, which enables
Delay & Focusing by amplifying the Echo propagated through, and reflected from, the media of
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