DC to 6 GHz
Envelope and TruPwr RMS Detector
Data Sheet
ADL5511
FEATURES
FUNCTIONAL BLOCK DIAGRAM
VPOS
Envelope tracking RF detector with output proportional to
input voltage
15
ADL5511
Separate TruPwr rms output
20pF
400Ω
BIAS AND POWER-
ENBL
4
14 FLT4
DOWN CONTROL
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
100Ω
11
G = 1.7
G = 1.5
VRMS
RMS
2
3
RFIN
FLT1
250Ω
10kΩ
10
9
VENV
EREF
ENVELOPE
5pF
250Ω
Single-supply operation: 4.75 V to 5.25 V
Supply current: 21.5 mA
0.8pF
VPOS
400Ω
0.4pF
VPOS
Power-down mode: 130 μW
13
6
7
8
12
16
1
5
FLT2
COMM
FLT3
NC
APPLICATIONS
Figure 1.
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
CH1 HIGH
20mV
VRMS
VENV
RF INPUT
CH1 200mV Ω CH2 30.8mV Ω M 100ns
CH3 200mV CH4 234mV Ω
A CH4
1.60V
T
–68ns
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
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 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 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 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 registeredtrademarks arethe 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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