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4.2.2
PRBSW unit circuit description
PRBSW unit is divided into the following 7 blocks.
1. PROBE CONNECT (Probe connector block) ( PRB PCB )
Interfaces with the probe.
EUB-5500 can connect three probes.
2. SEL_SW & RELAY (High voltage SW and relay block to switch the vibrator) ( PRB PCB )
A circuit to connect 48CH of transducer elements for transmit/receive out of maximum
192CH of transducer elements with the transmit/receive circuit system.
One system is provided for PROBE1 and 2, and one for PROBE3. Connection with
PROBE1 and PROBE2 is switched by a relay.
3. T_AMP (Transmit AMP block) ( AWP PCB )
A circuit to amplify transmit signals sent from DBF PCB.
Amplified signals drive the transducer as transmit signal.
4. T/R_DIV (Transmit/Receive separating circuit block) ( AWP PCB )
A circuit to separate extremely fine receive signal from high voltage transmit signal.
Also, it is mounted with an attenuation circuit to prevent waveform of receive signals
adjacent to those of high level from distorted due to amplification by PreAMP and gain
control AMP.
5. PREAMP (Primary stage amplifier block) ( AWP PCB )
A circuit to amplify receive signals by 26dB.
6. TGCAMP (Gain control amplifier block) ( AWP PCB )
An amplifier to amplify receive signals according to setting of B-Gain in order to create
optimum image by setting receive signal to appropriate input voltage level for the AD
converter.
It realizes uniform images by varying amplification factor in the depth direction.
7. R_FIL (Reception wave filter block) ( AWP PCB )
A filter circuit to remove a phenomenon called aliasing that occurs when the AD
converter (Analog to Digital) converts receive signal.
4 - 4
L1E-EA0229
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