LG KE820 Service Manual page 64

3. TECHNICAL BRIEF
Figure 39 Transmitter part block diagram
control pin VBIAS for efficiency enhancement. In GMSK mode, the PA is in saturated high efficiency
mode and is controlled via its VAPC pin directly by the baseband ramping DAC. In this way both up- /
down-ramping and output power level are set. In 8PSK mode, the ramping functionality is assured by
an on-chip ramping generator, whereas output power is controlled by the PGA's as described above.
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