RF2637 Ver la hoja de datos (PDF) - RF Micro Devices

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RF2637

RECEIVE AGC AMPLIFIER

RF Micro Devices 

RF2637

Application Schematic

C

D

M

A

I

F

F

i

l

t

e

r

CDMA+

CDMA-

M easurem ent

R eference P lane

ZS=500 Ω

Z S, EFF=333 Ω

Z IN, EFF= 5 0 0 Ω

1

R1:

1 kΩ

2

Z IN= 1 k Ω

3

G AIN

4

G A IN

4.7 kΩ

CONTROL

8

7

6

5

Z LO AD,EFF= 2 5 0 Ω

R 1 sets the C D M A balanced input im pedance. T he effective input im pedance is then 500 Ω .

R 2 sets the balanced output im pedance to 500 Ω . L1 and C 2 serve dual purposes. L1 serves

as an output bias choke , and C 2 serves as a series D C block. In addition, the values of L1 and

C 2 m ay be chosen to form an im pedance m atching netw ork of the load im pedance is not 500

Ω . O therw ise, the values of L1 and C 1 are chosen to form a parallel-resonant tank circuit at

the IF w hen the load im pedance is 500 Ω .

10 nF

V CC

C1 L1

C2

R2: 500Ω C2

ZLOAD=500Ω

OUT+

OUT-

C1 L1

V CC

M easurem ent

R eference P lane

10 nF

ZOUT=500 Ω

Evaluation Board Schematic

(Download Bill of Materials from www.rfmd.com.)

CDMA

J1

SMA

50 Ω μstrip

T1

GC

P1

P1-1 1 VCC

2 GND

P1-3 3 GC

C3

L1

15 pF 390 nH

C4

15 pF

C1

R1

10 nF 1 kΩ

L2

C2

390 nH 10 nF

R2

4.7 kΩ

C5

1 nF

1

2

3

4

GAIN

CONTROL

2627400A

C10

10 nF

8

VCC

L4

C8

7

390nH 15 pF

OUT

J2

6

R3

T2

50 Ω μstrip

SMA

510 Ω

5

L3

390nH

C9

15 pF

VCC

C6

10 nF

C7

10 nF

Rev A5 DS050829

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

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

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