40
20
0
TA = –40؇C
–20
TA = +85؇C
–40
–60
–80
0.5
TA = +25؇C
1.0
1.5
2.0
2.5
VGAIN – V
Figure 12. IF Amplifier Response Curve: Gain vs.
VGAIN, TA = –40°C, +25°C, +85°C
45
6.0
35
5.0
25
4.0
15
3.0
GAIN ERROR
5
2.0
–5
1.0
–15
0
–25
–1.0
–35
GAIN
–45
–2.0
–3.0
–55
–4.0
–65
–5.0
–75
–6.0
0.5
0.9
1.3
1.7
2.1
2.5
VGAIN – V
Figure 13. IF Amplifier Gain and Error vs. VGAIN
5.0
0
–5.0
–10.0
–15.0
–20.0
–25.0
0.5
0.9
1.3
1.7
2.1
2.5
VGAIN – V
Figure 14. IF Amplifier Input IP3 vs. VGAIN
AD6122
–24
–25
–26
–27
–28
2.5
2.7
2.9
3.1
3.3
3.5
3.7
SUPPLY VOLTAGE – V
Figure 15. IF Amplifier Input IP3 vs. Supply Voltage
–23
–24
–25
–26
50
100
150
200
250
300
350
FREQUENCY – MHz
Figure 16. IF Amplifier Input IP3 vs. Frequency
30.0
25.0
20.0
313MHz
15.0
238MHz
10.0
133MHz
5.0
–10.0
0
10.0
20.0
30.0
40.0
GAIN – dB
Figure 17. IF Amplifier Noise Figure vs. Gain
REV. B
–9–