AD831
12
1.00
0.75
1dB COMPRESSION POINT – dBm
10
0.50
8
GAIN ERROR – dB
0.25
0.00
–0.25
–0.50
6
4
2
–0.75
–1.00
10
0
10
100
FREQUENCY – MHz
1000
100
FREQUENCY – MHz
1000
Figure 7. 1 dB Compression Point vs. Frequency, Gain = 1
Figure 10. Gain Error vs. Frequency, Gain = 1
12
9
8
1dB COMPRESSION POINT – dBm
1dB COMPRESSION POINT – dBm
100
FREQUENCY – MHz
1000
10
7
6
5
4
3
2
1
8
6
4
2
0
10
0
10
100
FREQUENCY – MHz
1000
Figure 8. 1 dB Compression Point vs. RF Input, Gain = 2
Figure 11. 1 dB Compression Point vs. Frequency, Gain = 4
25
MIXER OUTPUT
TRANSFORMER
COUPLED PER FIGURE 18
11
V
S
= 9V
THIRD ORDER INTERCEPT – dBm
1dB COMPRESSION POINT – dBm
22
10
19
V
S
= 8V
9
16
MIXER PLUS AMPLIFIER,
G=1
8
LO LEVEL = –10dBm
IF = 10.7MHz
7
13
10
100
150
200
250
FREQUENCY – MHz
300
350
0
100
200
300
400
FREQUENCY – MHz
500
600
Figure 9. Third-Order Intercept vs. Frequency , LO Held
Constant at 241 MHz
Figure 12. Input 1 dB Compression Point vs. Frequency,
Gain = 1, 9 V Single Supply
REV. B
–5–
AD [ ANALOG DEVICES ]
