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MC33169
9
MOTOROLA ANALOG IC DEVICE DATA
CURVES RELATED TO APPLICATION GSM CLASS 4
Output RF
Voltage
Figure 12. RF Output Voltage (40 Hz/95% AM) and
VTx Driving Voltage
Figure 13. Idle, PA Drain, RF Output and VO
Voltages During a Burst Period
V
–50 ms
–25 ms
0 s
TIMEBASE = 5.0 ms/DIV
VERTICAL SCALE = 0.5 V/DIV
VT
VTx
–0 V
0 V
0 V
–350
μ
s
150
μ
s
850
μ
s
TIMEBASE = 5.0
μ
s/DIV
VERTICAL SCALE = 0.5 V/DIV
VO
0 V
Idle Voltage
VTx
Output RF Voltage
Negative
Voltage
Figure 14. RF Output Voltage, PA Drain Voltage
and VTx Driving Voltage, During Fall Time
Figure 15. RF Output Voltage, PA Drain Voltage and
VTx Driving Voltage, During Rise Time
–13.4
μ
s
11.6
μ
s
36.6
μ
s
TIMEBASE = 5.0
μ
s/DIV
VERTICAL SCALE = 0.5 V/DIV
–13.4
μ
s
11.6
μ
s
36.6
μ
s
VERTICAL SCALE = 0.5 V/DIV
VTx
PA Drain
Voltage
Output
RF Voltage
VTx
PA Drain
Voltage
Output
RF Voltage