Data Sheet

ADL5511

DC to 6 GHz Envelope and TruPwr RMS Detector

Rev. E

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FEATURES

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Envelope tracking RF detector with output proportional to input

voltage

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Separate TruPwr rms output

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No balun or external tuning required

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Excellent temperature stability

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Input power dynamic range of 47 dB

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Input frequency range from dc to 6 GHz

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130 MHz envelope bandwidth

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Envelope delay: 2 ns

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Single-supply operation: 4.75 V to 5.25 V

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Supply current: 21.5 mA

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Power-down mode: 130 µW

APPLICATIONS

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RMS power and envelope detection of W-CDMA, CDMA2000,

LTE, and other complex waveforms

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Drain modulation based power amplifier linearization

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Power amplifier linearization employing envelope-tracking meth-

ods

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

Figure 2. RMS and Envelope Response to a 20 MHz QPSK-Based LTE Carrier

(Test Model E-TM1_1_20MHz)

GENERAL DESCRIPTION

The ADL5511 is an RF envelope and TruPwr™ rms detector. The

envelope output voltage is presented as a voltage that is propor-

tional to the envelope of the input signal. The rms output voltage is

independent of the peak-to-average ratio of the input signal.

The rms output is a linear-in-V/V voltage with a conversion gain of

1.9 V/V rms at 900 MHz. The envelope output has a conversion

gain of 1.46 V/V at 900 MHz and is referenced to an internal 1.1 V

reference voltage, which is available on the EREF pin.

The ADL5511 can operate from dc to 6 GHz on signals with

envelope bandwidths up to 130 MHz.

The extracted envelope can be used for RF power amplifier (PA)

linearization and efficiency enhancements and the rms output can

be used for rms power measurement. The high rms accuracy and

fast envelope response are particularly useful for envelope detec-

tion and power measurement of broadband, high peak-to-average

signals that are used in CDMA2000, W‑CDMA, and LTE systems.

The ADL5511 operates from −40°C to +85°C and is available in a

16-lead, 3 mm × 3 mm LFCSP package.