HMC714LP5 Datasheet, PDF (28/40 Pages) Hittite Microwave Corporation – DUAL RMS POWER DETECTOR 0.1 - 3.9 GHz

v05.0309
HMC714LP5 / 714LP5E
DUAL RMS POWER DETECTOR
0.1 - 3.9 GHz
Channel Matching
Single channel RMS detectors exhibit part-to-part
variations that tend to complicate simultaneous power
readings. Simultaneous signal power measurements are
particularly useful for automatic gain/level control and VSWR
measurements. When separate power detectors are used, the
lack of an accurate match between the power detectors will
produce measurement errors. Calibration and compensation
methods are required to counteract the differences between
the separate power detectors. The Dual RMS detector package
greatly simplifies that activity, and will reliably produce more
accurate measurements.
The HMC714LP5E provides industry leading channel
matching performance with the use of proprietary techniques.
The channel mismatch is typically less than 20 mV over the
specified temperature and frequency range when the single-
ended input interface is used. Hittite “differential” evaluation
kits use M/A Com’s ETC1-1-13 balun, which are designed
to work up to 3 GHz. At frequencies lower than 3 GHz, the
mismatch between the two input baluns cause a larger variation
between the channels when compared to the single-ended
interface (typically ±25 mV up to 900 MHz and ±50 mV up to
2700 MHz). The input impedance mismatch presented by the
balun at signal frequencies beyond 3 GHz will further increase
the channel-to-channel variation. The “single-ended” input
interface does not have this limitation. The “single-ended”
interface can utilize the full input signal bandwidth of the power
detector; however the “single-ended” input interface is tuned.
The differential or balun input interface is best suited to very
wideband power measurements (100 MHz to 3 GHz), whereas
the single-ended input interface is best suited to signal power
measurement over bandwidths up to ±300 MHz (for ±1 dB
error tolerance) in the hole RF frequency range.
Channel Matching [RMSA-RMSB] in
Wideband Single Ended Configuration
0.16
0.12
0.08
0.04
0.1 GHz
0.5 Ghz
0.9 GHz
1.4 GHz
1.9 GHz
0
-0.04
-0.08
-0.12
Using wideband single-ended input interface
-0.16
-50
-40
-30
-20
-10
0
10
INPUT POWER (dBm)
Channel Matching [RMSA-RMSB]
@ 900 MHz
0.16
0.12
0.08
0.04
0
-0.04
-0.08
Using balun input interface
-0.12
-0.16
-50
-40
-30
-20
-10
0
10
INPUT POWER (dBm)
Channel Matching [RMSA-RMSB]
@ 3.5 GHz
0.16
Channel Matching [RMSA-RMSB] in
Single Ended Configuration tuned
@ 3.6 GHz
0.16
0.12
0.08
0.04
0
0.12
0.08
0.04
0
3.3 GHz
3.4 GHz
3.5 GHz
3.6 GHz
3.7 GHz
3.8 GHz
3.9 GHz
-0.04
-0.08
-0.04
-0.08
Using single-ended interface tuned for 3.6 GHz
-0.12
Using balun input interface
-0.16
-50
-40
-30
-20
-10
0
10
INPUT POWER (dBm)
-0.12
-0.16
-50
-40
-30
-20
-10
0
10
INPUT POWER (dBm)
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: [phone] Fax: [phone]
Order On-line at www.hittite.com
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