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No. 2D730-148E*O
(3)
Flow of signals in the front-end
unit
(a)
(b)
(c)
(d)
Transmission
system
Transmission
data from the RTC in the RC board is transferred to the TXPG in the TR
board. The transmission
delay and transmission waveform data are set. The TXPG
has a transmission
reference clock (40 MHz, four-phase)
and outputs the trigger signals
HOUT/LOUT
to the PULSER based on the clock. The PULSER outputs a bipolar
transmission
signal based on the trigger signal. The transmission
signal is output to the
transducer
connector port that is selected in the transducer
port selector of the TI board.
Reception system
The reception echo signal flows in the direction opposite to the flow of the transmission
drive signal via the same route and is input to the reception circuit in the TR board. The
reception signal is input to the RXAR-ASIC (PREAMP-IC).
The signal is amplified by
the specified amount and is input to the RXBF-ASIC in the RC board. The input signals
are AD-converted
in the RXBF-ASIC and reception beam forming is performed.
Beam
forming is performed simultaneously
in a maximum of four directions and the beams are
output to the BE board.
SCW transmission/reception
system
The SCW transmission
system is the same as that described in (a) above. The 64-ch
reception signal output from the TR board is input to the CB board that is connected to
the RC board in parallel. In the CB board, quadrature
detection is performed
in the
demodulator
after reception analog beam forming.
Then baseband signal processing is
performed and the signals are AD-converted.
The I/Q signals that have undergone AD
conversion are converted to serial data and are then output to the BE board.
Pencil CW transmission/reception
system
The CB board includes the pencil CW transmission/reception
circuit. The transmission
output signals in the CB board are passed through the pencil transducer connector
connected to the TI board using the cable and are then output to the pencil transducer
transmission
elements.
The echo signals received in the pencil transducer are also
passed through the TI and are input to the reception system in the CB board. After the
signals are amplified in the pencil CW receiver circuit in the CB board, they are passed
through the demodulator
or later blocks and are AD-converted.
4-2
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