參數(shù)資料
型號(hào)： 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(dòng)通信轉(zhuǎn)換器IC
文件頁數(shù)： 11/51頁
文件大小： 265K
代理商： P11997EJ2V0AN00
Application Note P11997EJ2V0AN00
11
3.
MEASUREMENT AND CALCULATION OF MAIN CHARACTERISTICS
In this product series, the electrical characteristics are specified by the test circuit shown in the data sheets which
RF input port and LO input port coupled to the signal generator with capacitor only. The purpose of these ratings is
to set a common point of reference since the impedance at the input port is high in relation to 50
and input
conversion characteristics vary according to the external circuitry.
The main items to be measured are the input/output levels, conversion gain (CG), and third-order intermodulation
distortion (IM
3
). As a rating for various items, CG is a ratio of the RF input power (P
RFin
) and the IF output’s
fundamental wave power (P
IFin
), and IM
3
refers to the frequency relationship between the IF output’s fundamental
waves (f
IFout
1, f
IFout
2) and distorted wave (f
IM3
) when there are two frequencies input to the RF input (for a detailed
theoretical description, see the literature on high-frequency electronic circuits).
CG (dB)
f
IM3
1 (Hz) = 2
×
f
IFout
1
f
IFout
2
f
IM3
2 (Hz) = 2
×
f
IFout
2
f
IFout
1
= P
IFout
P
RFin
These signal levels are obtained by measurements under certain frequency conditions. On the other hand, the
third-order distortion intercept point (IP
3
) is an extrapolated value from these measured characteristics. Therefore,
IP
3
is a virtual point that is used to calculate a value when we could not measure item under noise level of a
measuring instrument. Thus, there is an input level value (IIP
3
) and an output level value (OIP
3
). OIP
3
is intrinsically
rated according to the IC’s current efficiency due to D/U ratio of signals level appeared in output, while IIP
3
is
established according to the relation between OIP
3
and CG. The relationships among these characteristics are
graphed Figure 3-1. You should note that IIP
3
and OIP
3
are extrapolated values and are not actually measured
values.
In particular, the gradient (
IM
3
) for input to IM
3
has almost 3, but accurate value may deviate from 3.0. This is
because, mathematically,
IM
3
is a third-order gradient, which deviate from the theoretical condition based on the
internal chip, the mounted parasitic path, etc. Accordingly, you should calculate using actually measured values to
describe accurate distortion behavior.
IM
3
×
P
IFout
IM
3
IM
3
1
OIP
3
=
(dBm)
IM
3
×
P
RFin
+ CG
IM
3
IM
3
1
IIP
3
=
(dBm)
(Where OIP
3
= IIP
3
+ CG)
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