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參數(shù)資料
| 型號： | HMC1010LP4E |
| 廠商： | HITTITE MICROWAVE CORP |
| 元件分類： | 檢測器 |
| 英文描述： | 0 MHz - 3900 MHz RF/MICROWAVE LINEAR DETECTOR, 16 dBm INPUT POWER-MAX |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, PLASTIC, SMT, 24 PIN |
| 文件頁數(shù)： | 16/24頁 |
| 文件大?。?/td> | 2586K |
| 代理商： | HMC1010LP4E |
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 - 23
DC Offset Compensation Loop
Internal Dc offsets, which are input signal dependant, require continuous cancellation. offset cancellation is a critical
function needed for maintenance of measurement accuracy and sensitivity. the Dc offset cancellation loop performs
this function, and its response is largely defined by the capacitance (COFS) connected between COFSA, COFSB
pins.
coFs sets the loop bandwidth of the Dc offset compensations. Higher coFs values are required for measuring
lower rF frequencies. the optimal loop bandwidth setting will allow internal offsets to be cancelled at a minimally
acceptable speed.
Dc offset cancellation Loop ≈
Bandwidth , Hz
For example: loop bandwidth for Dc cancellation with coFs = 1nF, bandwidth is ~62 kHz
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 HMc1010LP4e 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 0.2 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 = 2.321V at Pin= -5 dBm,
and rMsoUt = 0.809V at Pin= -45 dBm
slope calibration constant = scc
SCC = (-45+5)/(0.809-2.321) = 26.45 dB/V
intercept calibration constant = Icc
ICC = Pin – SCC*RMSOUT = -5 – 26.45 * 2.321 = -66.39 dBm
HMC1010LP4E
v03.0511
RMS POWER DETECTOR
DC - 3.9 GHz
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