Keithley 4200-SCS, Руководство пользователя

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1-26 Return to Section Topics 4200-900-01 Rev. K / February 2017
Section 1: Getting Started Model 4200-SCS User’s Manual
Remote bias tee (RBT) and 3-port power divider
The 4205-RBT and power divider are used for the Keithley Instrument’s PulseIV-Complete and
Demo-PulseIV projects. Two RBT adapters and one 3-port power divider are included with the
4200-PIV-A solution bundle. Also included are two 4200-MAG-BASE mounts (that attach bias tee
adapters to the prober platen magnetically). For more information, refer to the
Reference Manual,
PulseIV-Complete and Demo-PulseIV projects, page 12-4 .
RBT
The RBT adapter (see Figure 1-23 ) is a coupler for DC bias from a SMU, and pulse output from a
Model 4205-PG2 pulse generator channel. The output of the RBT provides pulse output riding on
the DC V bias.
As shown in Figure 1-23 , the RBT has two three-lug female triax connectors for connection to a
SMU (FORCE and SENSE), and two female SMA connectors, one for AC inputs, such as a pulse
generator card and scope card (Model 4200-SCP2HR or 4200-SCP2), and one for AC+DC output
connection to a prober or directly to a DUT.
Figure 1-23 also shows the simplified schematic of the RBT. The capacitor allows pulses from the
pulse generator card to pass through to the output, while blocking DC from the SMU. The
inductors allow DC from the SMU to pass through to the output, while blocking pulses from the
pulse generator.
Figure 1-23
Model 4205-RBT simplified schematic
3-port power divider
The 3-
port power divide
r divides the electrical power equally among its three connectors using a
16.67 W resistor in each “leg” (see Figure 1-24 ). The power divider is used on the gate of a FET to
provide an impedance matched signal (pulse) path (50
Ω
).
As shown in Figure 1-24 , the power divider is equipped with two SMA female connectors and one
SMA male connector. The SMA male connector allows the power divider to connect directly to the
RBT (AC input).
4205-R BT Re m ote B ia s T ee
Connect to D UT
or Prober
1) W hen usin g a S M U PreAm p, use 4 200-TR X - X cables f or connections . W hen
N O T usin g a PreAm p, use 4 200- M TR X - X cables f or connections .
2 ) Use S M A cables ( male-to-male ) f or connections .
2
S M A Connectors
(f emale )
3-Lu g Triax Connectors
(f emale )
Connect to p ulse g enerator card
and / or sco p e card
2
Connect to
S M U S E NS E
1
Connect to
S M U FO RC E
1
AC
+
DC
O
u
t
pu
t
DC
Sen
s
e
20 k W
AC In pu t
DC
F
or
c
e