Preliminary Data Sheet
AS3802
Definition of CDMA Source Impedance,
Z
S
, and AS3802 Input Impedance Z
IN
Zs=500
Ω
Vp
CDMA+
IF Signal
Source
Vn
R=1k
Ω
Definition of Load Impedance, Z
L
, and
AS3802 Output Impedance Z
O
VCC
RX-CDMA
Z1
OUT+
Z1
Measurement
Reference Plane
CDMA-
Output
Port
OUT-
Z
0
ZL
eff
R
B
Z
L
Zin=1k
Ω
(typ)
The value of the 1k
Ω
resistor is calculated in the
matching network between the filter and the input of the
RX-APM.
RX-CDMA Output Port Impedance
Load Impedance
Bias Resistor
Bias Inductors
Effective Load
Definition of FM Source Impedance, Z
S
,
and AS3802 Input Impedance Z
IN
Zs=850
Ω
Vp
FM+
IF Signal
Source
Vn
FM-
(AC GND)
Z
O
>5kΩ
Z
L
=500Ω
R
B
=500Ω *
L=Choke,
ω.L>>R
B
*
Z
Leff
=250Ω
*Note:
Z
1
can be a resistor or a choke.
If it is a resistor Z
1
=R
1
=250Ω then R
B
is not
used.
If it is a choke,
ω.L>>R
B
and R
B
=500Ω.
Zin=850
Ω
(typ)
AC GND is defined as FM- in the package pin definition.
Rev. A
5/9
Jul 98
AMSCO [ AUSTRIAMICROSYSTEMS AG ]
