QPB9318

Dual-Channel Switch LNA Module

Data Sheet, August 10, 2017 | Subject to change without notice

3 of 14

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Application Circuit Schematic

– QPB9318PCB401

Notes:

For CH1 operation J10 (5V A1) always on +5Vdc and J7 (5V LNA2), J8 (5V LNA1) powered up to +5Vdc.

For CH2 operation J15 (5V A2) always on +5Vdc and J12 (5V LNA4), J13 (5V LNA3) powered up to +5Vdc.

• For CH1 RX operation (similar sequence for CH2):

1.

Set J11 (28V/0 T1) VMODE to high (+28Vdc).

2.

Set J9 (28V/0 R1) VMODE to low (0Vdc).

3.

Enable LNA’s J26 (PD2) to 0Vdc.

• For CH1 TX operation (similar sequence for CH2):

1.

Disable LNA’s J25 (PD1) to +5Vdc.

2.

Set J9 (28V/0 R1) VMODE to high (+28Vdc).

3.

Set J11 (28V/0 T1) VMODE to low (0Vdc).

• R2, R5, R7 & R8 need to be placed to improve the stability in the first stage LNA. It is recommended that they be placed as close

to the pin as possible.

J9

28V/0 R1

J8

5V LNA1

C3

100 pF

4

2

3

1

LNA2

8

6

7

5

21

23

22

24

17

19

18

20

LNA1

LNA4

LNA3

L2

68 nH

C2

1 uF

C4

33 pF

C1

33 pF

L1

22 nH

C5

33 pF

P1

Switch

Antenna port

Main Ch

L3

68 nH

R3

249



R1

249



J10

5V A1

J14

28V/0 R2

J13

5V LNA3

C18

100 pF

L9

68 nH

C20

1 uF

C17

33 pF

C19

33 pF

L10

22 nH

C16

33 pF

P6

Switch

Antenna port

Diversity Ch

L8

68 nH

R4

249



R6

249



J15

5V A2

C7

100 pF

L4

68 nH

C6

1 uF

J7

5V LNA2

P2

LNA OUT

Main Ch

C13

100 pF

L6

68 nH

C15

1 uF

J12

5V LNA4

P4

LNA OUT

Diversity Ch

L5

22 nH

J11

28V/0 T1

C8

33 pF

C9

33 pF

P3

Switch TX out

Main Ch

L7

22 nH

J16

28V/0 T2

C14

33 pF

C12

33 pF

P5

Switch TX out

Diversity Ch

J26

PD2

R7

20 k



R2

1K



C21

DNP

J25

PD1

R8

20 k



R5

1K



C30

DNP

C23

33pF

C25

DNP

C26

DNP

C29

33pF

C22

DNP

C28

DNP

C10

33 pF

C32

33 pF

L11

33 pF

L12

33 pF

C11

DNP

C31

DNP

C24

220



C27

220



C35

33 pF

C36

33 pF