RF2609 Ver la hoja de datos (PDF) - RF Micro Devices

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RF2609

CDMA/FM TRANSMIT AGC AMPLIFIER

RF Micro Devices 

10

RF2609

Application Schematic

Measurement

Reference Plane

ZS=1 kΩ

IN+

10 nF

1

10 nF

GAIN

CONTROL

3.3 kΩ

16

GAIN

IN-

2

15

10 nF

ZIN=1 kΩ

3

14

4

13

S 5

12

N 6

11

G 7

10

I 8

9

S ZLOAD,EFF=500 Ω

E R2 sets the balanced output impedance to 1 kΩ. L1 and C2

D serve dual purposes. L1 serves as an output bias choke,

10 nF

VCC

C1 L1

C2

R2:

1 kΩ

C2

C1

L1 ZOUT=1 kΩ

VCC

10 nF

ZLOAD=1 kΩ

CDMA Filter

OUT+

OUT-

Measurement

Reference Plane

and C2 serves as a series DC block. In addition, the values

of L1 and C2 may be chosen to form an impedance

matching network if the load impedance is not 1kΩ.

Otherwise, the values of L1 and C1 are chosen to form a

parallel-resonant tank circuit at the IF when the IF filter's

NEW input impedance is 1 kΩ.

NOT FOR

10-12

Rev B3 000822

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