Design Information

MMM6035 Advance Information, Rev. 2.4

14

Freescale Semiconductor

7

Design Information

7.1

Power Control

Open loop power control of the power amplifier is enabled when TX_EN is set high. The PA drain voltage

will then be proportional to the VRAMP input voltage over the range 200 mV to 2.2 V of VRAMP as

shown in Figure 4.

Figure 4. VD_OUT vs. VRAMP Characteristics

5

Remove RF drive

6

Remove VBAT

Table 12. Power Up/Down Sequences (continued)

SEQ

DESCRIPTION

Vramp

0

Voffset

VD_OUT

Vslope

VBAT

Vsat

Vctrl

Voffset

Vctrl