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ADL5315
1.5V
+
–
1.5V
1.5V
+
–
+
–
VPOS
SREF
VSET
2.2nF
HP89410A
VECTOR SIGNAL
ANALYZER
INPT
ADL5315
IOUT
9V
+
–
+12V
R INPUT
FET BUFFER
LNA
R LOAD
9V
–
–12V
+
Figure 31. Configuration for Noise Spectral Density and Wideband Current Noise
Figure 32 shows the configuration used to measure the pulse
response of I INPT to I OUT . To create the test current pulse, Q1 is
used in a common base configuration with the Agilent 33250A
pulse generator. The output of the 33250A is a negative biased
Q1
ADL5315
EVALUATION BOARD
INPT IOUT
VPOS VSET SREF COMM
R C
TDS5104
OSCILLOSCOPE
square wave with an amplitude that results in a one decade
R C
current step at I OUT .
AGILENT 33250A
PULSE GENERATOR
DC SUPPLIES/DMM
R C is chosen according to what current range is desired. For
30 μA and lower, the AD8067 FET input op amp is used in a
transimpedance amplifier configuration to allow for viewing on
Figure 32. Configuration for Pulse Response of I INPT to I OUT
the TDS5104 oscilloscope. For signals greater than 30 μA, the
ADA4899-1 replaced the AD8067 to avoid limiting the
TDS5104
OSCILLOSCOPE
VSET
ADL5315
EVALUATION BOARD
AGILENT 33250A
PULSE GENERATOR
bandwidth of the ADL5315.
INPT
IOUT
KEITHLEY 236
The configuration in Figure 33 is used to measure V INPT while
Q1
VPOS
SREF
COMM
V SET is pulsed. Q1 and R C are used to generate the operating
current on the INPT pin. An Agilent 33250A pulse generator is
used on the VSET pin to create a 0.0 V to 4.0 V square wave.
The setup in Figure 34 was used to measure the small signal ac
response from I INPT to I OUT . The AD8138 differential amplifier
R C
DC SUPPLIES/DMM
Figure 33. Configuration for Pulse Response from V SET to V INPT
NETWORK ANALYZER
was used to couple the ac and dc signals together. The ac signal
was modulated to a depth of 5% of full scale over frequency.
The voltage across R F sets the dc operating point of I INPT . The
OUTPUT
POWER
R
A
B
INPT IOUT
ADL5315
EVALUATION BOARD
R F
values of R F are chosen to result in decade changes in I INPT . The
SPLITTER
VPOS VSET SREF COMM
ADA4899-1 op amp is used as a transimpedance amplifier for
all current conditions.
+
–
AD8138
EVAL BOARD
+
–
R F
50 Ω
DC SUPPLIES/DMM
Figure 34. Configuration for Small-Signal AC Response
Rev. 0 | Page 15 of 20
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