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RF7321

DS120906

7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical

support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.

Preliminary Application Schematic

Evaluation Board Schematic

VMODE1

VMODE0

VEN

4.7uF

4.7uF (2)

NOTES:

1. The 50

 resistor should be removed if pin 8 is connected to another coupler for daisy chaining multiple couplers.

2. This capacitance value can be reduced for multi-PA with DC to DC converter applications where a total maximum

capacitive load is required to be met. Keeping at least a 1uF capacitor close to the PA Vcc pin is recommended.

RF OUT

CPL OUT

RF IN

50

 (1)

5

4

1

2

3

6

7

10

9

8

AMP

Bias Control

Enable

VCC1

VMODE1

VMODE0

VEN

C5

4.7uF

VCC2

C6

4.7uF

NOTES:

1. VCC2S is a sense line to be used if the test power supply has voltage sensing

capability. This compensates for any resistive voltage drop that occurs between

the power supply and the PA and thus ensures that the voltage at the PA is set as

expected.

J2

RF OUT

J3

CPL OUT

J1

RF IN

R2

51



5

4

1

2

3

6

7

10

9

8

AMP

Bias Control

Enable

C4

22uF

C8

10nF

C7

10nF

C9

10nF

C10

10nF

C11

10nF

P1_4

VMODE1

P1_5

VCC1

P1_6

P1_7

VCC2

P1_8

VCC2S (1)

P1_9

P1_3

VMODE0

P1_2

VEN

P1_1