PA2460/PA2460-LF Power Amplifier

Page 13

Aug 2008

Application Circuit

Fig 5

1.L7 > 120nH for RF choking.

2.Use R3 and R4 to adjust diode bias currents for low loss (~0.5dB loss at

1.1mA). And R3 and R4 must be large enough to provide an open to RF.

3.When CTL_TX is high and CTL_RX is low (select TX), then D1 is on and

R5 provides a reverse bias voltage to turn off D2,and thus provides RX/TX

isolation.

4.Since Pout is sensitive to Vapc, it is recommended to use a regulator to pro-

vide the Vapc voltage.

1

2

3

4

56

A

B

C

D

6

5

4

3

2

1

D

C

B

A

Title

Number

Revision

Size

B

Date:

23-Sep-2005

Sheet

of

File:

D:\my documents\client data file\pa2460_eddie\pa2460_eddie.Ddb

Drawn By:

C8

C6

C13

L5

L3

L4

L:616mil W:12mil

C10

C7

C2

C1

L2

L1

RF-IN

PA2460

C3

C4

C5

Vapc

Vcc

Vcc

L6

C11

D1

C14

L7

R3

IN

1

OUT

3

ADJ

2

U1

LM1117

R1

R2

C15

Vcc

C12

Regulator

D2

R5

ANTENNA

R4

CTL_RX

CTL_TX

RX

CTL_TX=HIGH,CTL_RX=LOW,select TX

CTL_TX=LOW,CTL_RX=HIGH,select RX

APC1

1

L1

2

RF_IN

3

VCC

4

L2

5

RF_OUT

6

RF_OUT

7

APC2

8

PA2460

C9