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ADL5511
(Rev.:RevA)

DC to 6 GHz Envelope and TruPwr RMS Detector

Analog Devices 

Data Sheet

DC to 6 GHz

Envelope and TruPwr RMS Detector

ADL5511

FEATURES

Envelope tracking RF detector with output proportional to

input voltage

Separate TruPwr rms output

No balun or external tuning required

Excellent temperature stability

Input power dynamic range of 47 dB

Input frequency range from dc to 6 GHz

130 MHz envelope bandwidth

Envelope delay: 2 ns

Single-supply operation: 4.75 V to 5.25 V

Supply current: 21.5 mA

Power-down mode: 130 μW

APPLICATIONS

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

LTE, and other complex waveforms

Drain modulation based power amplifier linearization

Power amplifier linearization employing envelope-tracking

methods

FUNCTIONAL BLOCK DIAGRAM

ADL5511

VPOS

15

ENBL 4

BIAS AND POWER-

DOWN CONTROL

400Ω 20pF

14 FLT4

RMS

100 Ω

G = 1.7

11 VRMS

RFIN 2

10kΩ

FLT1 3

250Ω

5pF

ENVELOPE

250Ω

0.4pF 400Ω

VPOS

13 6 7 8 12 16

NC

FLT2

1

FLT3

G = 1.5

0.8pF

VPOS

5

COMM

10 VENV

9 EREF

Figure 1.

VRMS

VENV

CH1 HIGH

20mV

RF INPUT

GENERAL DESCRIPTION

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

The envelope output voltage is presented as a voltage that is

proportional 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.

CH1 200mV Ω CH2 30.8mV Ω M 100ns A CH4

CH3 200mV CH4 234mV Ω T –68ns

1.60V

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

(Test Model E-TM1_1_20MHz)

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 detection 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.

Rev. A

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

www.analog.com

Fax: 781.461.3113 ©2011–2012 Analog Devices, Inc. All rights reserved.

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