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4.2.3
DBF PCB circuit description
DBF PCB is divided into the following 4 blocks.
1. Digital Beam Former ASIC (Transmit/Receive beam forming block ••• ASIC)
Generates transmit wave signals based on ultrasound transmit focus data.
Also, beam-formes received signals based on receive focus data then demodulates them
and outputs to EPI PCB as complex signal of I and Q.
Transmit and receive wave focus data is stored in SRAM.
2. AMP (Transmit signal output block)
Amplifies an analog signal (transmit signal) outputted from ASIC by about twofold and
outputs to AWP PCB.
3. ADC (A/D converter block)
Converts received signal (analog signal) outputted from PRBSW PCB to digital signal
and outputs to ASIC.
4. ASIC Controller (Control block)
Controls interface to sPCI BUS (cf. Section 4.2.4) and each ASIC and SRAM.
5. DUS Controller(Digital US control block)
Following instructions on the type of ultrasound beam and shot direction outputted
from US-Scan Controller of EPI PCB, it controls PRBSW PCB and DBF PCB. Digital
control to PRBSW PCB is through serial communication.
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L1E-EA0229
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