4-14
Theory of Operation
4.6.3.3
1M
Ω
Path
– The Hi-Z path has a switchable 20db attenuator (RL8)
which is used at input range settings of
≥
102 mV/div. There are two
adjustable capacitors C4 & C25 in this attenuator circuit, C25 is used
to adjust the pulse shape when the 20db attenuator is switched in and
C4 is used to adjust the input capacitance of the channel so that it is
the same when the 20db attenuator is not switched in. After the /10
attenuator there is a second /10 attenuator which is additionally
switched in at input range settings of
≥
1.02 V/div. C59 is used to adjust
the pulse shape when this attenuator is switched in. The signal then
passes through RL6 which is used to terminate the input to the Hi-Z
amplifier when 50
Ω
coupling is selected. Next the input signal splits
and follows two paths, DC and high frequency. In the block diagram
above, the upper path in the high impedance amplifier is the high
frequency stage and lower path is the DC stage. The DC stage is
preceded by RL4 which selects DC or AC coupling. R38 is used to
match the transfer functions of the high frequency and low frequency
path so that a square pulse shape can be obtained. The adjustable
cap C85 is used to provide additional drive for the high-Z buffer and
increase the bandwidth. The output of the buffer is then fed to the
HFE653 and this input is also terminated with a 50
Ω
resistor on the
front end card.
4.6.3.4
HFE653
– The HFE653 monolithic amplifier is the primary component
comprising the high bandwidth 50Ohm amplifier. The HFE provides the
following functions:
4.6.3.4.1 Gain control on inputs based on the sensitivity settings of
the DSO, so as to provide a 500mVpp differential signal at
the output of the amplifier.
4.6.3.4.2 Provide the capability to choose from three input channels.
4.6.3.4.3 Using a serial chain control to
Select one of the three input channels
Choose either BW limit filter path or the full BW path
Turn ON and OFF any output amplifiers
Provide a read back capability to read the latch states
and the device revision code.
Содержание WAVERUNNER 6000 SERIES
Страница 16: ...2 4 General Information This page intentionally left blank ...
Страница 22: ...This page intentionally left blank 3 6 Specifications ...
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Страница 84: ...5 42 Performance Verification WR6K Rev D 5 42 Performance Verification WR6K Rev D ...
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Страница 129: ...Figure 6 3 View of the power supply adjustment locations Maintenance 6 33 ...
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Страница 261: ...Figure 8 27 Dimensions Mechanical Parts 8 27 ...
Страница 262: ...8 28 Mechanical Parts Figure 8 28 Packing LeCroy Part Number Description 901878 00 Shipping Package Assy ...
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Страница 318: ...LeCroy Rackmount Kit for the 6000series ...
Страница 322: ...LeCroy 5U Rackmount Kit for the 6000series ...