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AD8319 Scheda tecnica(PDF) 1 Page - Analog Devices

Il numero della parte AD8319
Spiegazioni elettronici  Creating a Constant Envelope Signal Using the ADL5331 RFVGA and AD8319 Log Detector
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD8319 Scheda tecnica(HTML) 1 Page - Analog Devices

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Circuit Note
CN-0082
Circuit Designs Using Analog Devices Products
Apply these product pairings quickly and with confidence.
For more information and/or support call 1-800-AnalogD
(1-800-262-5643) or visit www.analog.com/circuit.
Devices Connected/Referenced
ADL5331
RF Variable Gain Amplifier (VGA)
AD8319
45-dB RF Log Detector/Controller
AD5621
12-Bit nanoDAC®
Creating a Constant Envelope Signal Using the ADL5331 RFVGA
and AD8319 Log Detector
Rev. 0
“Circuits from the Lab” from Analog Devices have been designed and built by Analog Devices
engineers. Standard engineering practices have been employed in the design and construction of
eachcircuit,andtheirfunctionandperformance havebeentestedandverifiedinalabenvironment
atroomtemperature.However,youaresolelyresponsible fortestingthe circuit anddetermining its
suitability and applicability for your use and application. Accordingly, in no event shall Analog
Devices be liable for direct, indirect, special, incidental, consequential or punitive damages due to
anycausewhatsoeverconnectedtotheuseofany“CircuitfromtheLab”. (Continuedonlastpage)
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
©2009 Analog Devices, Inc. All rights reserved.
CIRCUIT FUNCTION AND BENEFITS
Overall performance of a transmitter, wired or wireless, is a strong
function of the output power of the amplifier. If the signal is weak,
bit error rate (BER) or modulation error rate (MER) will degrade
due to low SNR. If the signal is too strong, distortion will cause the
same issues. This circuit uses the ADL5331 VGA, the AD8319
power detector, and the AD5621 low power nanoDAC to generate
output power control accurate to 12 bits. The AD8319 has very
high temperature stability to compensate for any gain variation
over temperature of the VGA, resulting in very accurate power
control over a wide temperature range. Because the AD8319
control input VSET and the output VOUT are related to the RF input
on a volts/dB scale and the AD5621 nanoDAC has a linear transfer
function, the resulting output power control will be a linear-in-dB
vs. DAC input code.
CIRCUIT DESCRIPTION
The ADL5331 variable gain amplifier provides accurate gain
control. However, more precise regulation of output power is
achieved with an automatic gain control (AGC) loop. Figure 1
shows the ADL5331 operating in an AGC loop. The addition of
the AD8319 log amp allows the AGC to have improved
temperature stability over a wide output power control range.
To operate the ADL5331 VGA in an AGC loop, a sample of the
output RF is back to the detector (typically using a directional
coupler and additional attenuation). A setpoint voltage is
applied by the AD5621 DAC to the VSET input of the detector
while VOUT is connected to the GAIN pin of the ADL5331.
Based on the detector’s defined linear-in-dB relationship
between VOUT and the RF input signal, the detector adjusts the
voltage on the GAIN pin (the detector’s VOUT pin is an error
INLO
INHI
GAIN
OPLO
OPHI
23dB
DIRECTIONAL
COUPLER
VPOS
COMM
ADL5331
+5V
+5V
+5V
+5V
COMM
VOUT
VPOS
VSET
INHI
INLO
CLPF
AD8319
LOG AMP
VOUT
SYNC
SCLK
SDIN
GND
AD5621
12-BIT DAC
VDD
RF OUTPUT
SIGNAL
RF INPUT
SIGNAL
1k
490
SETPOINT
VOLTAGE
220pF
1nF
1nF
120nH
120nH
100pF
100pF
100pF
100pF
ETC1-1-13
(M/A-COM)
ETC1-1-13
(M/A-COM)
Figure 1. ADL5331 Operating in an Automatic Gain Control Loop in Combination
with the AD8319 and AD5621 (Simplified Schematic)


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