RF2607 datasheet(4/8 Pages) RFMD

4 / 8 page

10-4

RF2607

Rev B2 010720

Application Schematic

GAIN

CONTROL

SEL.

10 nF

R1:

Ω

CDMA-

FM IN

CDMA+

IF IN

SELECT

4.7 k

Ω

10 nF

OUT+

OUT-

R2:

500

Ω

Measurement

Reference Plane

LOAD=500Ω

FM IF Filter

CDMA IF Filter

S=500 Ω

IN, EFF=500 Ω

IN=1 kΩ

S=850 Ω

S, EFF=333 Ω

IN=850 Ω

Measurement

Reference Plane

LOAD,EFF=250 Ω

OUT=500 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.

10 nF

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