HMC714LP5 datasheet(28/40 Pages) HITTITE

28 / 40 page

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12 - 141

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.

-0.16

-0.12

-0.08

-0.04

0.04

0.08

0.12

0.16

-50

-40

-30

-20

-10

0.1 GHz

0.5 Ghz

0.9 GHz

1.4 GHz

1.9 GHz

INPUT POWER (dBm)

Using wideband single-ended input interface

-0.16

-0.12

-0.08

-0.04

0.04

0.08

0.12

0.16

-50

-40

-30

-20

-10

INPUT POWER (dBm)

Using balun input interface

-0.16

-0.12

-0.08

-0.04

0.04

0.08

0.12

0.16

-50

-40

-30

-20

-10

3.3 GHz

3.4 GHz

3.5 GHz

3.6 GHz

3.7 GHz

3.8 GHz

3.9 GHz

INPUT POWER (dBm)

Using single-ended interface tuned for 3.6 GHz

-0.16

-0.12

-0.08

-0.04

0.04

0.08

0.12

0.16

-50

-40

-30

-20

-10

INPUT POWER (dBm)

Using balun input interface

Channel Matching [RMSA-RMSB] in

Wideband Single Ended Configuration

Channel Matching [RMSA-RMSB]

@ 900 MHz

Channel Matching [RMSA-RMSB] in

Single Ended Configuration tuned

@ 3.6 GHz

Channel Matching [RMSA-RMSB]

@ 3.5 GHz

Channel Matching

HMC714LP5 / 714LP5E

v05.0309

DUAL RMS POWER DETECTOR

0.1 - 3.9 GHz

HMC714LP5 Datasheet(PDF) 28 Page - Hittite Microwave Corporation

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