Structure and Assembly/Disassembly of the Machine
Figure 3-42 High voltage pulse output
2. Reception selection
The reception selection circuit is shown as follows:
Figure 3-43 Schematic diagram of the reception selection circuit
4. Voltage-controlled amplifier
To make the echo signal match the monitor, the internal circuit structure of the machine is
comprised of three parts, namely, low noise pre-amplifier
（
LNP
）
, voltage-controlled
attenuator
（
VCA
）
and programmable gain amplifier (PGA).
5. ATGC voltage generating circuit
The voltage of ATGC is generated by TLV5626
（
DAC
）
. TLV5626 can provide two-
channel DAC; one is used for generating PHV adjustment signal and the other is used for
DP-3300/DP-3200 Service Manual（V1.1） 3-7
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