Datasheet

AD8021
Rev. F | Page 17 of 28
TEST CIRCUITS
50Ω
–V
S
C
C
+V
S
5
R
S
R
O
R
D
R
F
C
F
R
G
R
IN
49.9Ω
50Ω CABLE
50Ω CABLE
01888-048
Figure 48. Noninverting Gain
FET
PROBE
5
50Ω
–V
S
C
C
+V
S
R
S
R
L
R
F
C
F
R
G
R
IN
49.9Ω
50Ω CABLE
C
L
01888-049
Figure 49. Noninverting Gain and FET Probe
5
50Ω
–V
S
C
C
+V
S
R
O
R
F
R
D
R
G
R
IN
49.9Ω
50Ω CABLE
49.9Ω
50Ω CABLE
01888-050
Figure 50. Inverting Gain
01888-051
HP8753D
50Ω
AD8021
499Ω499Ω
55.6Ω
499Ω
499Ω
49.9Ω
NETWORK
ANALYZER
C
C
5
+V
S
7pF
50Ω
–V
S
Figure 51. CMRR
5
HP8753D
AD8021
100Ω
NETWORK
ANALYZER
C
C
+V
S
50Ω
–V
S
7pF
R
G
499Ω
R
F
499Ω
01888-052
Figure 52. Output Impedance, Chip Enabled
01888-053
499Ω
AD8021
49.9Ω
49.9Ω
7pF
C
C
5
976Ω
1
8
1.0V
49.9Ω
499Ω
4V
53.6Ω
+V
S
–V
S
LOGIC REF
DISABLE
Figure 53. Enable/Disable
01888-054
7pF
5
1
8
HP8753D
50Ω
AD8021
499Ω499Ω
1kΩ
49.9Ω
NETWORK
ANALYZER
C
C
+V
S
50Ω
–V
S
49.9Ω
50Ω CABLE
FET
PROBE
LOGIC REF
DISABLE
Figure 54. Input-to-Output Isolation, Chip Disabled
AD8021
1
8
5
7pF
HP8753D
50Ω
100Ω
NETWORK
ANALYZER
C
C
+V
S
–V
S
01888-055
Figure 55. Output Impedance, Chip Disabled