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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)： | 10/21頁 |
| 文件大小： | 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 - 18
HMC909LP4E
v02.0511
RMS POWER DETECTOR
SINGLE-ENDED, DC - 5.8 GHz
LOG-Slope and Intercept
The HMC909LP4E provides for an adjustment of output scale with the use of an integrated operational amplifier. Log-
slope and intercept can be adjusted to “magnify” a specific portion of the input sensing range, and to fully utilize the
dynamic range of the rMs output.
A log-slope of 36.9mV/dB (@1900 MHz) is set by connecting RMS Output to VSET through resistor network for = 1
(see application schematic).
the log-slope is adjusted by applying the appropriate resistors on the rMs and Vset pins. Log-intercept is adjusted
by applying a Dc voltage to the Vset pin.
optimized slope =
* log-slope
Optimized intercept = log-intercept – (R
FBK /rset) * VBLINE
rFBK
rFBK // rsHUNt // rset
=
when r
FBK=0 to set rMsoUt=Vset, then =1/2
If rset is not populated, then
= * (RFBK/ (RFBK // RSHUNT)) and intercept is at nominal value.
example: the logarithmic slope can be simply increased by choosing appropriate rFBK and rsHUNt values while
not populating the rset resistor on the evaluation board to keep the intercept at nominal value.
setting rFBK =4.7KΩ and rsHUNt = 2.2KΩ results in an optimized slope of:
Optimized Slope = * log_slope = 1.57* 36.9mV / dB
optimized slope = 58 mV / dB
Slope Adjustment
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
-70
-60
-50
-40
-30
-20
-10
0
High Slope
Nominal
INPUT POWER (dBm)
RMSOUT
(V)
Slope = 58 mV/dB
Rset = open
Rfbk = 4.7 Kohm
Rshunt = 2.2 Kohm
Slope = 36.9 mV/dB
Rset = open
Rfbk = 4.7 Kohm
Rshunt = 4.7 Kohm
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