Design Information

MMM6035 Advance Information, Rev. 2.4

Freescale Semiconductor

17

Figure 7. Vrf vs. Vramp characteristic

The calibration points Vrf(1) and Vrf(2) are each measured by forcing Vramp levels of Vramp(1) and

Vramp(2) respectively. The estimated Vramp level for the required RF output voltage Vrf(E) is then

calculated from the following:

Eqn. 1

In a similar way Vpedestal can be calculated:

Eqn. 2

Table 13. Recommended Calibration Values

Description

Symbol

Value

Unit

Vramp at calibration point (1)

Vramp(1)

0.3

V

Vramp at calibration point (2)

Vramp(2)

1.5

V

Output power with Vramp=Vpedestal (Low band)

Po(P)_LB

1

dBm

Output power with Vramp=Vpedestal (High band)

Po(P)_HB

-3.5

dBm

Active Vramp rise time

Tr_ramp

14

µs

Active Vramp fall time

Tf_ramp

14

µs

Pedestal Width

-

12

µs

Vramp (V)

0

Vrf Vrms

Vpedestal Vramp(1)

Vramp(2)

Vrf(P)

Vrf(1)

Vrf(2)

Estimated point

Calibration point(1)

Calibration point(2)

Vramp(E)

Vrf(E)

0

Calibration point(1)

Calibration point(2)

Vramp E

()

Vramp 2

()xVrf E

() Vrf 1

()

–

[] Vramp 1

()xVrf 2

() Vrf E

()

–

[]

+

Vrf 2

() Vrf 1

()

–

----------------------------------------------------------------------------------------------------------------------------------------------------------------

=

Vramp 2

()

–

[] Vramp 1

()xVrf 2

()

–

[]

+

Vrf 2

() Vrf 1

()

–

--------------------------------------------------------------------------------------------------------------------------------------------------------------

=