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參數(shù)資料
| 型號(hào)： | MAX2016ETI |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | LF-to-2.5GHz Dual Logarithmic Detector/ Controller for Power, Gain, and VSWR Measurements |
| 中文描述： | DUAL LOG OR ANTILOG AMPLIFIER, 22 MHz BAND WIDTH, QCC28 |
| 封裝： | 5 X 5 MM, 0.80 MM HEIGHT, MO-220-WHHD, TQFN-28 |
| 文件頁(yè)數(shù)： | 13/19頁(yè) |
| 文件大?。?/td> | 405K |
| 代理商： | MAX2016ETI |
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M
LF-to-2.5GHz Dual Logarithmic Detector/
Controller for Power, Gain, and VSWR Measurements
______________________________________________________________________________________
13
VSWR can similarly be calculated through the following
relationship:
Measuring Gain
The MAX2016 can be used to measure the gain of an
RF block (or combination of blocks) through the imple-
mentation outlined in Figure 3. As shown, a coupled
signal from the input of the block is fed into RFINA,
while the coupled output is connected to RFINB. The
DC output voltage at OUTD is proportional to the power
difference (i.e., gain).
The gain of a complete receiver or transmitter lineup
can likewise be measured since the MAX2016 accepts
RF signals that range from low frequency to 2.5GHz;
see Figure 4. The MAX2016 accurately measures the
gain, regardless of the different frequencies present
within superheterodyne architectures.
Measuring Power (RSSI Detector Mode)
In detector mode, the MAX2016 acts like a receive-sig-
nal-strength indicator (RSSI), which provides an output
voltage proportional to the input power. This is accom-
plished by providing a feedback path from OUTA
(OUTB) to SETA (SETB) (R1/R2 = 0
; see Figure 5).
By connecting SET_ directly to OUT_, the op-amp gain
is set to 2V/V due to two internal 20k
feedback resis-
tors. This provides a detector slope of approximately
18mV/dB with a 0.5V to 1.8V output range.
Gain-Controller Mode
The MAX2016 can be used as a gain controller within
an automatic gain-control (AGC) loop. As shown in
Figure 6, RFINA and RFINB monitor the VGA’s input
and output power levels, respectively. The MAX2016
produces a DC voltage at OUTD that is proportional to
the difference in these two RF input power levels. An
internal op amp compares the DC voltage with a refer-
ence voltage at SETD. The op amp increases or
decreases the voltage at OUTD until OUTD equals
SETD. Thus, the MAX2016 adjusts the gain of the VGA
to a level determined by the voltage applied to SETD.
Power-Controller Mode
The MAX2016 can also be used as a power
detector/controller within an AGC loop. Figure 7 depicts
a scenario where the MAX2016 is employed as the
AGC circuit. As shown in the figure, the MAX2016 mon-
itors the output of the PA through a directional coupler.
An internal integrator (Figure 5) compares the detected
signal with a reference voltage determined by V
SET_
.
The integrator, acting like a comparator, increases or
decreases the voltage at OUT_, according to how
closely the detected signal level matches the V
SET_
ref-
erence. The MAX2016 maintains the power of the PA to
a level determined by the voltage applied to SET_.
VSWR
RL
20
RL
20
=
1 10
1 10
MAX2016
RFINA
RFINB
IN
LOGARITHMIC
DETECTOR
LOGARITHMIC
DETECTOR
GND
OUTD
SETD
20k
COUPLER
COUPLER
RF BLOCK
OUT
OUTD
Figure 3. Gain Measurement Configuration
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX2016ETI+ | 功能描述:射頻檢測(cè)器 LF-2.5GHz Dual Log Detector/Controller RoHS:否 制造商:Skyworks Solutions, Inc. 配置: 頻率范圍:650 MHz to 3 GHz 最大二極管電容: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SC-88 封裝:Reel |
| MAX2016ETI+D | 制造商:Maxim Integrated Products 功能描述:DUAL LOGARITHMIC DETECTOR/CNTRLR 28TQFN EP - Rail/Tube |
| MAX2016ETI+T | 功能描述:射頻檢測(cè)器 LF-2.5GHz Dual Log Detector/Controller RoHS:否 制造商:Skyworks Solutions, Inc. 配置: 頻率范圍:650 MHz to 3 GHz 最大二極管電容: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SC-88 封裝:Reel |
| MAX2016ETI+TD | 制造商:Maxim Integrated Products 功能描述:DUAL LOGARITHMIC DETECTOR/CNTRLR TQFN EP - Tape and Reel |
| MAX2016ETI-T | 功能描述:射頻檢測(cè)器 LF-2.5GHz Dual Log Detector/Controller RoHS:否 制造商:Skyworks Solutions, Inc. 配置: 頻率范圍:650 MHz to 3 GHz 最大二極管電容: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SC-88 封裝:Reel |
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