MC13201 Technical Data, Rev. 1.1,

Freescale Semiconductor

23

Figure 14 also shows a dual antenna configuration where there is a RX antenna and a TX antenna. For the

receive side, the RX antenna is ac-coupled to the differential RFIN inputs and these capacitors along with

inductor L1 form a matching network. Inductors L2 and L3 are ac-coupled to ground to form a frequency

trap. For the transmit side, the TX antenna is connected to the differential PAO outputs, and inductors L4

and L5 provide DC-biasing to VDDA but are ac-isolated. CT_Bias is not required or used.

Figure 14. Dual Port RF Configuration Examples

Using External Antenna Switch with LNA

Using Dual Antenna

Balun

Bypass

RFIN_P (PAO_P)

RFIN_M (PAO_M)

CT_Bia

s

PAO_P

PAO_M

MC13201

LNA

Ant

Sw

Balun

VDD

VDDA

Bypass

RFIN_P (PAO_P)

RFIN_M (PAO_M)

CT_Bias

PAO_P

PAO_M

MC13201

VDDA

TX Antenna

Bypass

Bypass

L1

L2

L3

L4

L5

RX Antenna