AS3802 datasheet(5/9 Pages) AMSCO

5 / 9 page

Preliminary Data Sheet

AS3802

Rev. A

5/9

Jul 98

Definition of CDMA Source Impedance,

ZS, and AS3802 Input Impedance ZIN

IF Signal

Source

CDMA+

Zs=500

Ω

Zin=1k

Ω (typ)

CDMA-

R=1k

Ω

The value of the 1k

Ω resistor is calculated in the

matching network between the filter and the input of the

RX-APM.

Definition of FM Source Impedance, ZS,

and AS3802 Input Impedance ZIN

IF Signal

Source

FM+

Zs=850

Ω

Zin=850

Ω (typ)

FM-

(AC GND)

AC GND is defined as FM- in the package pin definition.

Definition of Load Impedance, ZL, and

AS3802 Output Impedance ZO

RX-CDMA

Measurement

Reference Plane

OUT+

Output

Port

OUT-

VCC

ZLeff

RX-CDMA Output Port Impedance

ZO>5k

Ω

Load Impedance

ZL=500

Ω

Bias Resistor

RB=500

Ω *

Bias Inductors

L=Choke,

ω.L>>R

Effective Load

ZLeff=250

Ω

*Note:

Z1 can be a resistor or a choke.

If it is a resistor Z1=R1=250

Ω then R

B is not

used.

If it is a choke,

ω.L>>R

B and RB=500

Ω.

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