AD7002
0.0
–5.0
–10.0
–15.0
–20.0
GAIN – dB
GROUP DELAY –
µs
0.80
0.70
0.60
0.50
0.40
0.30
0.20
0.10
–25.0
–30.0
–35.0
–40.0
–45.0
–50.0
–55.0
–60.0
1.00 + 03
1.00 + 04
1.00 + 05
FREQUENCY – Hz
1.00 + 06
1.00 + 07
0.00
1.00 + 03
1.00 + 04
1.00 + 05
FREQUENCY – Hz
1.00 + 06
1.00 + 07
Figure 5. Transmit Filter Frequency Response
Figure 6. Transmit Filter Group Delay
GMSK SPECTRUM TEST, DC TO 6.4MHz.
FREQUENCY RESOLUTION: 30.1514kHz
0
–10
–20
MAGNITUDE – dB
MAGNITUDE – dB
10
0
–10
–20
–30
–40
GMSK MASK
–50
–60
–30
–40
–50
–60
–70
–80
–90
0
8.0
1.6
2.4
3.2
4.0
4.8
5.6
6.4
FREQUENCY – MHz
–70
GMSK SPECTRUM
–80
–90
0
100
200
300
400
500
600
700
800
900
1000
FREQUENCY – kHz
Figure 7. Typical Spectrum Plot of the Transmit Channel
When Transmitting Random Data (0 MHz to 6.4 MHz)
Figure 8. Typical Spectrum Plot of the Transmit Channel
When Transmitting Random Data (0 MHz to 1 MHz)
PEAK PHASE TRAJECTORY ERROR = 1.56
°
RMS PHASE TRAJECTORY ERROR = 0.79
°
PEAK PHASE TRAJECTORY ERROR – Degrees
5
4
3
I
2
+ Q
2
– Voltage
1.27
1.26
2
1
0
–1
–2
–3
–4
–5
1.25
1.24
1.23
1.22
1.21
Figure 9. Typical Plot of the Transmit Phase Trajectory
Error
Figure 10. Typical Plot of the Composite Vector Magnitude
REV. B
–9–
AD [ ANALOG DEVICES ]
