參數(shù)資料
型號： P11997EJ2V0AN00
英文描述： uPC2757. uPC2758. and uPC8112. 3-V Power Supply. 1.9-GHz Frequency Down-converter ICs for Mobile Communication
中文描述： uPC2757。 uPC2758。和uPC8112。 3 - V單電源供電。 1.9 - GHz的頻率下，移動通信轉(zhuǎn)換器IC
文件頁數(shù)： 21/51頁
文件大?。?/td> 265K
代理商： P11997EJ2V0AN00
Application Note P11997EJ2V0AN00
21
The output intercept point is mainly determined by the supply current from the output pin to the internal
components. So, OIP3 is determined by the DC resistance of the inductor, neither Q value nor the load Q value.
Consequently, inductor should select lower DC resistance value. The input conversion’s IP
3
and IM
3
characteristics are determined by the output intercept point (which is itself determined using DC) and by the CG
(which is itself determined using AC).
Any of the RF input pin’s external circuit types can be determined based on whether the system’s emphasis is
on the CG or the input IP
3
. Variation in characteristics according to the input pin’s external components is
similar in the
μ
PC2757 and
μ
PC2758. As an example of the S parameter for an RF input port with 50-
termination, refer to the Smith chart and log MAG chart shown in Figures 4-10 and 4-11. Thus, the VSWR can
be improved by such an external connection.
These application circuits are implemented using RF-type external components and there is no change in the
characteristics of DC-related items.
In the growing of systems such as digital mobile communications in which input conversion distortion is
emphasized, this document shows data for each product model measured on circuits with RF 50-
termination as
reference data for application circuit characteristics. Figures 4-12 and 4-13 show the corresponding performance
curves and Tables 4-1 and 4-2 list the characteristics.
Figure 4-6.
μ
PC2757T: Comparison of Characteristics from External Circuit Connection to RF Pin
(Using Circuit from Figure 4-3)
Distortion vs. RF Input Level
μ
60
50
40
30
20
10
0
10
20
+10
0
10
20
30
40
50
60
70
90
80
V
CC
= 3.0 V T
A
= +25
°
C
f
RFin
1
= 866.45 MHz
f
RFin
2
= 866.85 MHz
f
LOin
= 846.2 MHz
P
LOin
=
10 dBm
When using RF pin
matching method (<1>)
When using data
sheet measuring circuit
When using RF pin with 50-
termination (<2>)
Common conditions:
I
I
T
3
RF input level P
RFin
(dBm)
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