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AD8302-EVAL

更新时间: 2024-11-23 22:29:15
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亚德诺 - ADI /
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24页 531K
描述
LF.2.7 GHz RF/IF Gain and Phase Detector

AD8302-EVAL 数据手册

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LF–2.7 GHz  
RF/IF Gain and Phase Detector  
a
AD8302  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
Measures Gain/Loss and Phase up to 2.7 GHz  
Dual Demodulating Log Amps and Phase Detector  
Input Range –60 dBm to 0 dBm in a 50 System  
Accurate Gain Measurement Scaling (30 mV/dB)  
Typical Nonlinearity < 0.5 dB  
Accurate Phase Measurement Scaling (10 mV/Degree)  
Typical Nonlinearity < 1 Degree  
Measurement/Controller/Level Comparator Modes  
Operates from Supply Voltages of 2.7 V–5.5 V  
Stable 1.8 V Reference Voltage Output  
Small Signal Envelope Bandwidth from DC to 30 MHz  
AD8302  
MFLT  
VIDEO OUTPUT – A  
+
+
VMAG  
INPA  
60dB LOG AMPS  
(7 DETECTORS)  
OFSA  
MSET  
PSET  
PHASE  
COMM  
DETECTOR  
OFSB  
INPB  
APPLICATIONS  
RF/IF PA Linearization  
Precise RF Power Control  
60dB LOG AMPS  
(7 DETECTORS)  
VPHS  
PFLT  
+
VIDEO OUTPUT – B  
Remote System Monitoring and Diagnostics  
Return Loss/VSWR Measurements  
Log Ratio Function for AC Signals  
1.8V  
VPOS  
BIAS  
x3  
VREF  
The signal inputs are single-ended, allowing them to be matched  
and connected directly to a directional coupler. Their input  
impedance is nominally 3 kat low frequencies.  
PRODUCT DESCRIPTION  
The AD8302 is an innovative, fully integrated system for mea-  
suring gain/loss and phase in numerous receive, transmit, and  
instrumentation applications. It requires few external compo-  
nents and a single supply of 2.7 V–5.5 V. The ac-coupled input  
signals can range from –60 dBm to 0 dBm in a 50 system, from  
low frequencies up to 2.7 GHz. The outputs provide an accu-  
rate measurement of either gain or loss over a 30 dB range  
scaled to 30 mV/dB, and of phase over a 0°–180° range scaled to  
10 mV/degree. Both subsystems have an output bandwidth of  
30 MHz, which may optionally be reduced by the addition of  
external filter capacitors. The AD8302 can be used in direct  
control mode to servo gain and phase of a signal chain toward  
predetermined setpoints.  
The AD8302 includes a phase detector of the multiplier type,  
but with precise phase balance, driven by the fully limited sig-  
nals appearing at the outputs of the two logarithmic amplifiers.  
Thus, the phase accuracy measurement is independent of signal  
level over a wide range.  
The phase and gain output voltages are simultaneously available  
at loadable ground referenced outputs over the standard output  
range of 0 V to 1.8 V. The output drivers can source or sink up  
to 8 mA. A loadable, stable reference voltage of 1.8 V is avail-  
able for precise repositioning of the output range by the user.  
In controller applications, the connection between the gain  
output pin VMAG and the setpoint control pin MSET is broken.  
The desired setpoint is presented to MSET and the VMAG  
control signal drives an appropriate external variable gain device.  
Likewise, the feedback path between the phase output pin VPHS  
and its setpoint control pin PSET may be broken, to allow  
operation as a phase controller.  
The AD8302 comprises a closely matched pair of demodulating  
logarithmic amplifiers, each having a 60 dB measurement range.  
By taking the difference of their outputs, a measurement of  
the magnitude ratio or gain between the two input signals is  
available. These signals may even be at different frequencies,  
allowing the measurement of conversion gain or loss. The AD8302  
may be used to determine absolute signal level by applying the  
unknown signal to one input and a calibrated ac reference signal  
to the other. With the output stage feedback connection dis-  
abled, a comparator may be realized, using the setpoint pins  
MSET and PSET to program the thresholds.  
The AD8302 is fabricated on Analog Devices’ proprietary, high-  
performance 25 GHz SOI complementary bipolar IC process. It is  
available in a 14-lead TSSOP package and operates over a –40°C  
to +85°C temperature range. An evaluation board is available.  
REV. 0  
Information furnished by Analog Devices is believed to be accurate and  
reliable. However, no responsibility is assumed by Analog Devices for its  
use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat  
may result from its use. No license is granted by implication or otherwise  
under any patent or patent rights of Analog Devices.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781/329–4700  
Fax: 781/326-8703  
www.analog.com  
© Analog Devices, Inc., 2001  

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