AD600/AD602
90
80
70
OVERALL GAIN – dB
75
70
65
60
50
40
30
20
10
0
–10
–0.5
A1
COMBINED
A2
S/N RATIO – dB
2.0
2.5
3.0
60
55
50
45
40
35
30
0.0
0.0
0.5
1.0
V
C
1.5
0.2
0.4
0.6
V
C
0.8
1.0
1.2
1.4
Figure 5. Plot of Separate and Overall Gains in Sequential
Control
Figure 8. SNR for Cascaded Stages—Parallel Control
5
4
3
2
1.2
1.0
0.8
0.6
GAIN ERROR – dB
0.0
0.5
1.0
V
C
1.5
2.0
2.5
3.0
GAIN ERROR – dB
1
0
–1
–2
–3
–4
–5
–6
–7
–8
–0.5
0.4
0.2
0.0
–0.2
–0.4
–0.6
–0.8
–1.0
–1.2
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3
V
C
Figure 6. Gain Error for Cascaded Stages—Sequential
Control
Figure 9. Gain Error for Cascaded Stages—Low Ripple
Mode
5
4
3
80
75
70
2
GAIN ERROR – dB
S/N RATIO – dB
1
0
–1
–2
–3
65
60
55
50
45
–4
–5
–0.1
0
0.2
0.4
0.6
V
C
0.8
1.0
1.2
40
35
0.0
0.2
0.4
0.6
V
C
0.8
1.0
1.2
1.4
Figure 7. Gain Error for Cascaded Stages—Parallel
Control
Figure 10. ISNR vs. Control Voltage—Low Ripple Mode
REV. A
–7–
AD [ ANALOG DEVICES ]
