ADL5315 Analog Devices, ADL5315 Datasheet - Page 15

• Manufacturer Part Number: ADL5315
• Description: Precision Wide Range (3 nA to 3 mA) High-Side Current Mirror
• Manufacturer: Analog Devices

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