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參數(shù)資料
| 型號： | HMC909LP4E |
| 廠商： | HITTITE MICROWAVE CORP |
| 元件分類： | 檢測器 |
| 英文描述： | 0 MHz - 5800 MHz RF/MICROWAVE LINEAR DETECTOR, 10 dBm INPUT POWER-MAX |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, PLASTIC, SMT, 24 PIN |
| 文件頁數(shù)： | 13/21頁 |
| 文件大?。?/td> | 3028K |
| 代理商： | HMC909LP4E |
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
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11 - 20
HMC909LP4E
v02.0511
RMS POWER DETECTOR
SINGLE-ENDED, DC - 5.8 GHz
Standby Mode
the eNX can be used to force the power detector into a low-power standby mode. As eNX is deactivated, power is
restored to all of the circuits. there is no memory of previous conditions. coming-out of stand-by, internal integration
and coFs capacitors will require recharging, so if large scI values have been chosen, the wake-up time will be
lengthened.
Modulation Performance – Crest factor performance
the HMc909LP4e can detect modulated signals with very high crest factors accurately.
For example, up to 2.7 GHz, a modulated rF signal with a crest factor of 15 dB can be detected with 0.3 dB error.
RMSOUT Error vs.
Crest Factor over Frequency
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
3
4
5
6
7
8
9
10
11
12
13
14
15
900 MHz error from CW (-22 dBm)
1900 MHz error from CW (-22 dBm)
2700 MHz error from CW (-22 dBm)
3900 MHz error from CW (-22 dBm)
CREST FACTOR (dB)
RMSOUT
ERROR
(dB)
System Calibration
Due to part-to-part variations in log-slope and log-intercept, a system-level calibration is recommended to satisfy
absolute accuracy requirements. when performing this calibration, choose at least two test points: near the top end
and bottom-end of the measurement range. It is best to measure the calibration points in the regions (of frequency
and amplitude) where accuracy is most important. Derive the log-slope and log-intercept, and store them in non-
volatile memory.
For example if the following two calibration points were measured at 2.2 GHz:
with rMsoUt = 1.81V at Pin= -20 dBm,
and rMsoUt = 1.03V at Pin= -40 dBm
slope calibration constant = scc
SCC = (-40+20)/(1.03-1.81) = 25.64 dB/V
intercept calibration constant = Icc
ICC = Pin – SCC*RMSOUT = -20 - 25.64 * 1.81 = -66.41 dBm
Now performing a power measurement at -30 dBm:
rMsoUt measures 1.40V
[Measured Pin] = [Measured RMSOUT]*SCC + ICC
[Measured Pin] = 1.40 * 25.64 - 66.41 = -30.51 dBm
An error of only 0.51 dB
Factory system calibration measurements should be made using an input signal representative of the application. If
the power detector will operate over a wide range of frequencies, choose a central frequency for calibration.
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