ADL5317
 
Rev. 0 | Page 13 of 16 
DP 8200
DC POWER SUPPLY
HP89410A
VECTOR SIGNAL
ANALYZER
+
+
+
VPHV
VAPD
VPLV
VSET
IPDM
ADL5317
+
+
+
+
+
33?/SPAN>F
604?/SPAN>
1k?/SPAN>
83nF
R1
GE 273
+
+9V
FET BUFFER
R
L
ALKALINE
D CELLS
ALKALINE
D CELL
ALKALINE
D CELLS
+9V
20k?/SPAN>
LNA
12V
+12V
 
Figure 26. Configuration for Noise Spectral Density and  
Wideband Current Noise 
TDS5104
ADL5317
EVALUATION BOARD
VAPD
FALT  VPHV VPLV  VSET  VCLH
IPDM
DC SUPPLIES/DMM
1pF
R
C
R
C
AGILENT
33250A
Q1
AD8067
 
Figure 27. Configuration for Pulse Response from I
APD
 to I
PDM
 
ADL5317
EVALUATION BOARD
VAPD
FALT  VPHV  VPLV   IPDM   VCLH
VSET
AGILENT
33250A
R
C
Q1
TDS5104
DC SUPPLIES/DMM
 
Figure 28. Configuration for Pulse Response from VSET to VAPD
NETWORK ANALYZER
OUTPUT    R
B
A
POWER
SPLITTER
AD8138
EVAL BOARD
+
+
ADL5317
EVAL BOARD
VAPD
VSET
COMM
VPHV
VPLV
60V
5V
AD8045
1V
50?/SPAN>
R
F
IPDM
R
F
 
Figure 29. Configuration for Small Signal AC Response  
The setup in Figure 26 is used to measure the output current 
noise of the ADL5317. Batteries are used in numerous places to 
minimize introduced noise and remove the uncertainty 
resulting from the use of multiple dc supplies. In application, 
properly bypassed dc supplies provide similar results. The load 
resistor is chosen for each current to maximize signal-to-noise 
ratio while maintaining measurement system bandwidth (when 
combined with the low capacitance JFET buffer). The custom 
LNA is used to overcome noise floor limitations in the 
HP89410A signal analyzer. 
Figure 27 shows the configuration used to measure the IAPD 
pulse response. To create the test current pulse, Q1 is used in a 
common base configuration with the Agilent 33250A, generating a 
negative biased square wave with an amplitude that results in a 
one decade current step on IPDM.  
RC is chosen according to what current range is desired. Only 
one cable is used between the Agilent 33250A and RC, while 
everything else is connected with SMA connectors. A FET 
scope probe connects the output of the AD8067 to the  
TDS5104 input. 
The configuration in Figure 28 is used to measure VAPD while 
VSET is pulsed. Q1 and RC are used to generate the operating 
current on the VAPD pin. An Agilent 33250A pulse generator is 
used on the VSET pin to create a 1.6 V to 2.4 V square wave. 
The capacitance on the GARD pin is 2 nF for this test. 
The setup in Figure 29 is used to measure the frequency 
response from I
APD
 to I
PDM
. The AD8138 differential op amp 
delivers a 1.250 V dc offset to bias the NPN transistor and to 
have a 500 mV drop across RF. This voltage is modulated to a 
depth of 5% of full scale over frequency. The voltage across RF 
sets the dc operating point of IAPD. RF values are chosen to result 
in decade changes in I
APD
. The output current at the IPDM pin 
is fed into an AD8045 op amp configured to operate as a 
transimpedance amplifier. The Feedback Resistor, R
F
, is the 
same value as that on the output of the AD8138. Note that any 
noise at the VSET input is amplified by the ADL5317 with a 
gain of 30. This noise shows up on VAPD and causes errors 
when measuring nanoamp current levels. This noise can be 
filtered by use of the GARD pin. See the GARD Interface 
section for more details.