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参数资料
| 型号： | HMC714LP5E |
| 厂商： | HITTITE MICROWAVE CORP |
| 元件分类： | 检测器 |
| 英文描述： | 100 MHz - 5800 MHz RF/MICROWAVE LINEAR DETECTOR, 15 dBm INPUT POWER-MAX |
| 封装： | 5 X 5 MM, ROHS COMPLIANT, PLASTIC, SMT, 32 PIN |
| 文件页数： | 20/40页 |
| 文件大小： | 1985K |
| 代理商： | HMC714LP5E |
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For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
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Application Information
Principle of Operation
Monolithic true-RMS detectors are in-effect analog calculators,
calculating the RMS value of the input signal, unlike other
types of power detectors which are designed to respond to the
RF signal envelope. At the core of an RMS detector is a full-
wave rectifier, log/antilog circuit, and an integrator. The RMS
output signal is directly proportional to the logarithm of the
time-averaged VIN2. The bias block also contains temperature
compensation circuits which stabilize output accuracy over the
entire operating temperature range. The DC offset cancellation
circuit actively cancels internal offsets so that even very small
input signals can be measure accurately.
The iPAR feature tracks the RF envelope and provides a signal
which is directly proportional to signal power, normalized to
average real power calculated by the RMS circuitry. Reading
both the iPAR and RMS output voltage signals provides a
very informative picture of the RF input signal: peak power,
average power, peak-to-average power, and RF wave-shape.
Simultaneous measurement of signal power and average
power is essential for taking full advantage of a receive signal
chain’s available dynamic range, while avoiding saturation, or
to maximize transmitter efficiency.
Where is op-amp gain set via resistors on the V
set
pin.
P
in
= V
RMS
/[log-slope]+[log-intercept], dBm
VRMSOUT =
1
ln(kG
2∫V
IN
2dt)
k
ViPAR =
m
VIN2
-1 + iREF
k ∫VIN2dt
0
1
2
3
4
-65
-55
-45
-35
-25
-15
-5
5
15
Measured
Ideal
RMS
OUTPUT
VOLTAGE
(V)
INPUT POWER (dBm)
VRMS vs. PIN
0.25
0.75
1.25
1.75
2.25
-0.5
0
0.5
1
1.5
012345
IN
S
[A,B]
(V)
INPUT
RF
SIGNAL
ENVELOPE
(V)
Time (usec)
IPAR Output
Input RF Signal Envelope
iPAR Output & Input RF Signal Envelope
vs. Time for an Input Crest Factor of
9.03 dB @ 1900 MHz [1]
HMC714LP5 / 714LP5E
v07.1109
DUAL RMS POWER DETECTOR
0.1 - 5.8 GHz
[1] Differential Input Configuration with baluns, RF Input Power @ -20 dBm
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