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RF2607

CDMA/FM RECEIVE AGC AMPLIFIER

RF Micro Devices 

RF2607

Application Schematic

10

Measurement

Reference Plane

ZS=500 Ω

Z S, EFF=333 Ω

CDMA IF Filter

CDMA+

1

R1:

CDMA-

1 kΩ

2

Z IN, EFF=500 Ω

Z IN=1 kΩ

FM IF Filter

3

Z IN=850 Ω

FM IN

4

IN

SEL.

ZS=850 Ω

10 nF

5

6

IF IN

SELECT

7

NC 8

GAIN

CONTROL 16

15

14

13

12

11

10

9

ZLOAD,EFF=250 Ω

R1 sets the CDMA balanced input impedance. The effective input impedance is then 500 Ω.

R2 sets the balanced output impedance to 500 Ω. L1 and C2 serve dual purposes. L1

serves as an output bias choke, 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 of the load

impedance is not 500 Ω. Otherwise, the values of L1 and C1 are chosen to form a parallel-

resonant tank circuit at the IF when the load impedance is 500 Ω.

4.7 kΩ

GC

10 nF

10 nF

VCC

C1 L1

C2

R2:

500Ω

C2

ZLOAD=500Ω

OUT+

OUT-

C1 L1

VCC

Measurement

Reference Plane

10 nF

ZOUT=500 Ω

10-4

Rev B2 010720

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