AD9865
IAMP PATH TYPICAL PERFORMANCE CHARACTERISTICS
AVDD = CLKVDD = DVDD = DRVDD = 3.3 V, fOSCIN = 50 MSPS, RSET = 1.58 kΩ, 1:1 transformer coupled output (see Figure 64 and
Figure 65) into 50 Ω load, half- or full-duplex interface, default power bias settings.
20
15
48
46
44
42
40
38
36
34
32
30
RBW = 2.3kHz
2.5MHz
5MHz
10
5
0
–5
–10
–15
–20
–25
–30
–35
–40
–45
–50
–55
–60
10MHz
20MHz
15MHz
0
5
10
15
20
25
3.0
3.5
4.0
4.5
5.0
FREQUENCY (MHz)
VCM (V)
Figure 39. Dual-Tone Spectral Plot of IAMPN Output
(IAMP Settings of I = 12.5 mA, N = 4, G = 0,
2:1 Transformer into 75 Ω Loader, VCM = 4.8 V)
Figure 42. IOUTN Third-Order Intercept vs. Common-Mode Voltage
(IAMP Settings of I = 12.5 mA, N = 4, G = 0, 2:1
Transformer into 75 Ω Load)
0
42
PAR = 11.4
RMS = 10.3dBm
–10
–20
–30
–40
–50
–60
–70
–80
40
2.5MHz
38
5MHz
36
10MHz
15MHz
34
32
20MHz
30
3.0
0
5
10
15
20
25
3.5
4.0
4.5
5.0
FREQUENCY (MHz)
VCM (V)
Figure 40. Spectral Plot of 84-Carrier OFDM Test Vector Using IAMPN in
Current-Mode Configuration
Figure 43. IOUTG Third-Order Intercept vs. Common-Mode Voltage
(IAMP Settings of I = 4.25 mA, N = 0, G = 6,
(IAMP Settings of I = 10 mA, N = 4, G = 0; VCM = 4.8 V)
2:1 Transformer into 75 Ω Load)
0
0
PAR = 11.4
PAR = 11.4
RMS = 10.4dBm
RMS = 9.8dBm
RBW = 10kHz
–10
–10
–20
–30
–40
–50
–60
–70
–80
–20
–30
–40
–50
–60
–70
–80
0
5
10
15
20
25
0
5
10
15
20
25
FREQUENCY (MHz)
FREQUENCY (MHz)
Figure 44. Spectral Plot of 84-Carrier OFDM Test Vector Using IAMP in
Voltage-Mode Configuration with AVDD = 3.3 V
Figure 41. Spectral Plot of 84-Carrier OFDM Test Vector Using IAMP in
Voltage-Mode Configuration with AVDD = 5 V
(PBR951 Transistors, IAMP Settings of I = 6 mA, N = 2, G = 6)
(PBR951 Transistors, IAMP Settings of I = 6 mA, N = 2, G = 6)
Rev. A | Page 18 of 48
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