參數(shù)資料
型號(hào)： MAX2010ETI-T
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 無(wú)繩電話/電話
英文描述： 500MHz to 1100MHz Adjustable RF Predistorter
中文描述： TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, QCC28
封裝： 5 X 5 MM, 0.80 MM HEIGHT, TQFN-28
文件頁(yè)數(shù)： 13/19頁(yè)
文件大?。?/td> 543K
代理商： MAX2010ETI-T
M
500MHz to 1100MHz Adjustable
RF Predistorter
______________________________________________________________________________________
13
Phase Expansion Circuitry
Figure 1 shows a typical PA
’
s phase behavior with
respect to input power. For input powers less than the
breakpoint level, the phase remains relatively constant.
As the input power becomes greater than the break-
point level, the phase begins to compress and deterio-
rate the power amplifier
’
s linearity. To compensate for
this AM-PM distortion, the MAX2010 provides phase
expansion, which occurs at the same breakpoint level
but with the opposite slope. The overall result is a flat
phase response.
Phase Expansion Breakpoint
The phase expansion breakpoint is typically controlled
by a digital-to-analog converter (DAC) connected
through the PBIN pin. The PBIN input voltage range of
0V to V
CC
corresponds to a breakpoint input power
range of 0.7dBm to 23dBm. To achieve optimal perfor-
mance, the phase expansion breakpoint of the
MAX2010 must be set to equal the phase compression
breakpoint of the PA.
Phase Expansion Slope
The phase expansion slope of the MAX2010 must also
be adjusted to equal the opposite slope of the PA
’
s
phase compression curve. The phase expansion slope
of the MAX2010 is controlled by the PFS1, PFS2, PDCS1,
and PDCS2 pins. With pins PFS1 and PFS2 AC-coupled
and connected to a variable capacitor or varactor diode,
the PFS1 and PFS2 pins perform the task of fine tuning
the phase expansion slope. Since off-chip varactor
diodes are recommended for this function, they must
be closely matched and identically biased. A minimum
effective capacitance of 2pF to 6pF is required
to achieve the full phase slope range as specified in
the
Electrical Characteristics
tables.
As shown in Figure 2, the varactors connected to PFS1
and PFS2 are in series with three internal capacitors on
each pin. By connecting and disconnecting these inter-
nal capacitors, a larger change in phase expansion
slope can be achieved through the logic levels present-
ed at the PDCS1 and PDCS2 pins. The phase expan-
sion slope is at its maximum when both V
PDCS1
and
V
PDCS2
equal 0V. The phase tuning has a minimal
effect on the small-signal gain.
Gain Expansion Circuitry
In addition to phase compression, the PA also suffers
from gain compression (AM-AM) distortion, as shown in
Figure 3. The PA gain curve remains flat for input pow-
ers below the breakpoint level, and begins to compress
at a given rate (slope) for input powers greater than the
breakpoint level. To compensate for such gain com-
pression, the MAX2010 generates a gain expansion,
which occurs at the same breakpoint level with the
opposite slope. The overall result is a flat gain response
at the PA output.
C
IMPROVED
PHASE DISTORTION
M
MAX2010
PHASE EXPANSION
P
BREAKPOINT
PA PHASE
COMPRESSION
SLOPE
P
IN
(dBm)
P
IN
(dBm)
P
IN
(dBm)
Figure 1. PA Phase Compression Canceled by MAX2010 Phase Expansion
相關(guān)PDF資料
PDF描述
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MAX2015 0.1GHz to 2.5GHz, 75dB Logarithmic Detector/Controller
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX2010EVKIT 功能描述:射頻前端 Evaluation Kit for the MAX2009 MAX2010 RoHS:否 制造商:Skyworks Solutions, Inc. 類(lèi)型: 工作頻率:2.4 GHz, 5 GHz 最大數(shù)據(jù)速率:54 Mbps 噪聲系數(shù): 工作電源電壓:3.3 V 電源電流:180 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-32
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MAX20-11.0CA 制造商:MDE 制造商全稱(chēng):MDE Semiconductor, Inc. 功能描述:HIGH CURRENT TRANSIENT VOLTAGE SUPPRESSOR (TVS) DIODE
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MAX20-12.0CA 制造商:MDE 制造商全稱(chēng):MDE Semiconductor, Inc. 功能描述:HIGH CURRENT TRANSIENT VOLTAGE SUPPRESSOR (TVS) DIODE
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