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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，移動通信轉換器IC |
| 文件頁數(shù)： | 8/51頁 |
| 文件大?。?/td> | 265K |
| 代理商： | P11997EJ2V0AN00 |
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Application Note P11997EJ2V0AN00
8
2.
OVERVIEW OF PRODUCTS
2.1 Lineup by External Size
The
μ
PC2757,
μ
PC2758, and
μ
PC8112 are high-frequency silicon monolithic ICs, which are developed as 1st
frequency down-converter IC receivers for cellular and cordless telephones. In addition to the existing 6-pin mini
mold package (size 2915), a 6-pin super mini mold (size 2012) is also available. Suffixes T and TB, which are
appended in the part number represent packages and denote mini mold and super mini mold, respectively. In this
lineup, one part number includes only one type of circuitry with the package size distinction made by the suffix T
(conventional) or TB (shrink), which is the same rule employed for the up-converter series (but is not the case for the
amplifier series). Since the chip layout and size are changed when the TB type is employed, impedance values
between T and TB types differ slightly. Other electrical characteristics, however, are identical between the two types.
2.2 Lineup by Characteristics and IF Output Format
The lineup offers the option of choosing a product and its external circuitry according to the desired characteristics.
The features of products taking the
μ
PC2757 as the basis of comparison are shown below.
μ
PC2758:
μ
PC2757 with higher gain and higher output intercept points
μ
PC8112:
μ
PC2757 with higher input intercept points, and an improved input conversion IM
3
level
* Circuit current comparisons (from least to greatest current):
μ
PC2757 <
μ
PC8112 <
μ
PC2758
Figure 2-1 shows internal block diagrams of these products.
The
μ
PC2757 has the same block configuration as the
μ
PC2758, which includes an input mixer, LO amplifier, and
IF output amplifier. The input mixer blocks in the
μ
PC2758 have almost the same characteristics as the
μ
PC2757.
In the
μ
PC2758, increasing the IF output amplifier’s current raises the output intercept point while obtaining high
gain. Concerning the intermodulation distortion characteristic, although the graphed plot for the input level and third-
order intermodulation distortion (IM
3
) level is weighted slightly toward the second-order level (2.7) when compared to
the ordinary third-order plot, the IM
3
level is higher compared to the third-order plot, which is calculated from the
crosspoint IP
3
using a logical expression.
The
μ
PC8112 excludes an emitter-follower-type IF output amplifier; instead the mixer is designed as an open
collector output. The mixer without the IF output amplifier has a larger circuit current. The circuit can be optimized in
output return loss and input intercept points by externally matching the output impedance with the next connected
device, which improves the IM
3
level for the relatively high input intercept point and input conversion. The IM
3
level is
also improved by the intermodulation distortion characteristic of the output circuit, in which the input level and IM
3
level’s graphed plot is closer to a third-order plot than the
μ
PC2757 and
μ
PC2758.
A double balanced mixer (DBM) and a high-isolation LO amplifier are used to prevent leakage, which effectively
minimizes LO leakage to RF/IF ports and RF leakage to LO ports.
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