a RF/IF Gain and Phase Detector LF–2.7 GHz AD8302

1 Information furnished by Analog Devices is believed to be accurate andreliable. However, no responsibility is assumed by Analog Devices for itsuse, nor for any infringements of patents or other rights of third parties thatmay result from its use. No license is granted by implication or otherwiseunder any patent or patent rights of Analog GHzRF/IF gain and Phase DetectorFUNCTIONAL BLOCK DIAGRAMMFLTVMAGMSETPSETVPHSPFLTVREFVIDEO OUTPUT AINPAOFSACOMMOFSBINPBVPOS+ + 60dB LOG AMPS(7 detectors )60dB LOG AMPS(7 detectors )VIDEO OUTPUT BPHASEDETECTOR+ gain /Loss and Phase up to GHzDual Demodulating Log Amps and Phase DetectorInput Range 60 dBm to 0 dBm in a 50 SystemAccurate gain Measurement Scaling (30 mV/dB)Typical Nonlinearity < dBAccurate Phase Measurement Scaling (10 mV/Degree)Typical Nonlinearity < 1 DegreeMeasurement/Controller/Level Comparator ModesOperates from Supply Voltages of V VStable V Reference Voltage OutputSmall Signal Envelope Bandwidth from DC to 30 MHzAPPLICATIONSRF/IF PA LinearizationPrecise RF Power ControlRemote System Monitoring and DiagnosticsReturn Loss/VSWR MeasurementsLog Ratio Function for AC SignalsPRODUCT DESCRIPTIONThe AD8302 is a fully integrated system for measuring gain /lossand Phase in numerous receive, transmit, and instrumentationapplications.

2 It requires few external components and a singlesupply of V V. The ac-coupled input signals can rangefrom 60 dBm to 0 dBm in a 50 system, from low frequenciesup to GHz. The outputs provide an accurate measurementof 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 subsystems have an output bandwidth of 30 MHz, whichmay optionally be reduced by the addition of external filtercapacitors. The AD8302 can be used in controller mode toforce the gain and Phase of a signal chain toward AD8302 comprises a closely matched pair of demodulatinglogarithmic amplifiers, each having a 60 dB measurement taking the difference of their outputs, a measurement ofthe magnitude ratio or gain between the two input signals isavailable. These signals may even be at different frequencies,allowing the measurement of conversion gain or loss. The AD8302may be used to determine absolute signal level by applying theunknown signal to one input and a calibrated ac reference signalto the other.

3 With the output stage feedback connection dis-abled, a comparator may be realized, using the setpoint pinsMSET and PSET to program the signal inputs are single-ended, allowing them to be matchedand connected directly to a directional coupler. Their inputimpedance is nominally 3 k at low AD8302 includes a Phase Detector of the multiplier type,but with precise Phase balance driven by the fully limited signalsappearing at the outputs of the two logarithmic , the Phase accuracy measurement is independent of signallevel over a wide Phase and gain output voltages are simultaneously availableat loadable ground referenced outputs over the standard outputrange of 0 V to V. The output drivers can source or sink upto 8 mA. A loadable, stable reference voltage of V is avail-able for precise repositioning of the output range by the controller applications, the connection between the gainoutput pin VMAG and the setpoint control pin MSET is desired setpoint is presented to MSET and the VMAG control signal drives an appropriate external variable gain , the feedback path between the Phase output pin VPHSand its setpoint control pin PSET may be broken to allowoperation as a Phase AD8302 is fabricated on Analog Devices proprietary, highperformance 25 GHz SOI complementary bipolar IC process.

4 It isavailable in a 14-lead TSSOP package and operates over a 40 Cto +85 C temperature range. An evaluation board is BOne Technology Way, Box 9106, Norwood, MA 02062-9106, Tel: 2018 Analog Devices, Inc. All rights reserved. Technical Support Feedback 2 AD8302 SPECIFICATIONS(TA = 25 C, VS = 5 V, VMAG shorted to MSET, VPHS shorted to PSET, shuntresistors connected to INPA and INPB, for Phase measurement PINPA = PINPB, unless otherwise noted.)ParameterConditionsMinTypMaxUnitO VERALL FUNCTIONI nput Frequency Range>02700 MHzGain Measurement RangePIN at INPA, PIN at INPB = 30 dBm 30dBPhase Measurement Range IN at INPA > IN at INPB 90 DegreeReference Voltage OutputPin VREF, 40 C TA +85 INTERFACEPins INPA and INPBI nput Simplified Equivalent CircuitTo AC Ground, f 500 MHz3 2k pFInput Voltage RangeAC-Coupled (0 dBV = 1 V rms) 73 13dBVre: 50 600dBmCenter of Input Dynamic Range 43dBV 30dBmMAGNITUDE OUTPUTPin VMAGO utput Voltage Minimum20 Log (VINPA/VINPB) = 30 dB30mVOutput Voltage Maximum20 Log (VINPA/VINPB) = +30 Point of Output (MCP)

5 VINPA = VINPB900mVOutput CurrentSource/Sink8mASmall Signal Envelope BandwidthPin MFLT Open30 MHzSlew Rate40 dB Change, Load 20 pF 10 k 25V/ sResponse TimeRise TimeAny 20 dB Change, 10% 90%50nsFall TimeAny 20 dB Change, 90% 10%60nsSettling TimeFull-Scale 60 dB Change, to 1% Settling300nsPHASE OUTPUTPin VPHSO utput Voltage MinimumPhase Difference 180 Degrees30mVOutput Voltage MaximumPhase Difference 0 Center PointWhen INPA = INPB 90 900mVOutput Current DriveSource/Sink8mASlew Rate25V/ sSmall Signal Envelope Bandwidth30 MHzResponse TimeAny 15 Degree Change, 10% 90%40ns120 Degree Change CFILT= 1 pF, to 1% Settling500ns100 MHzMAGNITUDE OUTPUTD ynamic Range 1 dB Linearity PREF = 30 dBm (VREF = 43 dBV)58dB dB Linearity PREF = 30 dBm (VREF = 43 dBV)55dB dB Linearity PREF = 30 dBm (VREF = 43 dBV)42dBSlopeFrom Linear Regression29mV/dBDeviation vs. TemperatureDeviation from Output at 25 C 40 C TA +85 C, PINPA = PINPB = 30 from Best Fit Curve at 25 C 40 C TA +85 C, PINPA = 25 dB, PINPB = 30 Measurement BalancePINPA = PINPB = 5 dBm to 50 OUTPUTD ynamic RangeLess than 1 Degree Deviation from Best Fit Line145 DegreeLess than 10% Deviation in Instantaneous Slope143 DegreeSlope (Absolute Value)From Linear Regression about 90 or +90 10mV/DegreeDeviation vs.

6 TemperatureDeviation from Output at 25 C 40 C TA +85 C, Delta Phase = 90 from Best Fit Curve at 25 C 40 C TA +85 C, Delta Phase = 30 B 3 AD8302 ParameterConditionsMinTypMaxUnit900 MHzMAGNITUDE OUTPUTD ynamic Range 1 dB Linearity PREF = 30 dBm (VREF = 43 dBV)58dB dB Linearity PREF = 30 dBm (VREF = 43 dBV)54dB dB Linearity PREF = 30 dBm (VREF = 43 dBV)42dBSlopeFrom Linear vs. TemperatureDeviation from Output at 25 C 40 C TA +85 C, PINPA = PINPB = 30 from Best Fit Curve at 25 C 40 C TA +85 C, PINPA = 25 dB, PINPB = 30 Measurement BalancePINPA = PINPB = 5 dBm to 50 OUTPUTD ynamic RangeLess than 1 Degree Deviation from Best Fit Line143 DegreeLess than 10% Deviation in Instantaneous Slope143 DegreeSlope (Absolute Value)From Linear Regression about 90 or +90 Deviation from Best Fit Curve at 25 C 40 C TA +85 C, Delta Phase = 90 40 C TA +85 C, Delta Phase = 30 Measurement BalancePhase @ INPA = Phase @ INPB, PIN = 5 dBm to 50 MHzMAGNITUDE OUTPUTD ynamic Range 1 dB Linearity PREF = 30 dBm (VREF = 43 dBV)57dB dB Linearity PREF = 30 dBm (VREF = 43 dBV)54dB dB Linearity PREF = 30 dBm (VREF = 43 dBV)42dBSlopeFrom Linear vs.

7 TemperatureDeviation from Output at 25 C 40 C TA +85 C, PINPA = PINPB = 30 from Best Fit Curve at 25 C 40 C TA +85 C, PINPA = 25 dB, PINPB = 30 Measurement BalancePINPA = PINPB = 5 dBm to 50 OUTPUTD ynamic RangeLess than 1 Degree Deviation from Best Fit Line128 DegreeLess than 10% Deviation in Instantaneous Slope120 DegreeSlope (Absolute Value)From Linear Regression about 90 or +90 Deviation from Best Fit Curve at 25 C 40 C TA +85 C, Delta Phase = 90 40 C TA +85 C, Delta Phase = 30 Measurement BalancePhase @ INPA = Phase @ INPB, PIN = 5 dBm to 50 dBm1 Degree2200 MHzMAGNITUDE OUTPUTD ynamic Range 1 dB Linearity PREF = 30 dBm (VREF = 43 dBV)53dB dB Linearity PREF = 30 dBm (VREF = 43 dBV)51dB dB Linearity PREF = 30 dBm (VREF = 43 dBV)38dBSlopeFrom Linear vs. TemperatureDeviation from Output at 25 C 40 C TA +85 C, PINPA = PINPB = 30 from Best Fit Curve at 25 C 40 C TA +85 C, PINPA = 25 dB, PINPB = 30 Measurement BalancePINPA = PINPB = 5 dBm to 50 OUTPUTD ynamic RangeLess than 1 Degree Deviation from Best Fit Line115 DegreeLess than 10% Deviation in Instantaneous Slope110 DegreeSlope (Absolute Value)From Linear Regression about 90 or +90 10mV/DegreeDeviationLinear Deviation from Best Fit Curve at 25 C 40 C TA +85 C, Delta Phase = 90 40 C TA +85 C, Delta Phase = 30 VOLTAGEPin VREFO utput VoltageLoad = 2 k = V to CurrentSource/Sink (Less than 1% Change)5mAPOWER SUPPLYPin Current (Quiescent)VS = 5 V1925mA 40 C TA +85 C2127mASpecifications subject to change without notice.

8 REV. B AD8302 4 ABSOLUTE MAXIMUM RATINGS1 Supply Voltage VS .. VPSET, MSET Voltage .. VS + VINPA, INPB Maximum Input .. 3 dBVEquivalent Power Re. 50 .. 10 dBm JA2 .. 150 C/WMaximum Junction Temperature .. 125 COperating Temperature Range .. 40 C to +85 CStorage Temperature Range .. 65 C to +150 CLead Temperature Range (Soldering 60 sec) .. 300 CNOTES1 Stresses above those listed under Absolute Maximum Ratings may cause perma-nent damage to the device. This is a stress rating only; functional operation of thedevice at these or any other conditions above those indicated in the operationalsection of this specification is not implied. Exposure to absolute maximum ratingconditions for extended periods may affect device 1S Standard (2-layer) board CONFIGURATIONTOP VIEW(Not to Scale)1 COMMAD8302 INPAOFSAVPOSOFSBINPBCOMMMFLTVMAGMSETVREF PSETVPHSPFLT234567141312111098 PIN FUNCTION DESCRIPTIONSE quivalentPin , 7 COMMD evice Common.

9 Connect to low impedance Input Impedance to Channel A. Must be A3 OFSAA capacitor to ground at this pin sets the offset compensation filter cornerCircuit Aand provides input Supply (VS), V to V5 OFSBA capacitor to ground at this pin sets the offset compensation filter cornerCircuit Aand provides input to Channel B. Same structure as A8 PFLTLow Pass Filter Terminal for the Phase OutputCircuit E9 VPHSS ingle-Ended Output Proportional to the Phase Difference between INPAC ircuit Band Pin for Scaling of VPHS Output Voltage in Measurement DApply a setpoint voltage for controller Generated Reference Voltage ( V Nominal)Circuit C12 MSETF eedback Pin for Scaling of VMAG Output Voltage Measurement DAccepts a set point voltage in controller Output. Output voltage proportional to the decibel ratioof signals applied to INPA and B14 MFLTLow Pass Filter Terminal for the Magnitude OutputCircuit ECAUTIONESD (electrostatic discharge) sensitive device.

10 Electrostatic charges as high as 4000 V readilyaccumulate on the human body and test equipment and can discharge without detection. Althoughthe AD8302 features proprietary ESD protection circuitry, permanent damage may occur ondevices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions arerecommended to avoid performance degradation or loss of !ESD SENSITIVE DEVICEREV. BAD8302 5 INPA(INPB)OFSA(OFSB)VPOSON TOLOG-AMP+ COMM10pF4k 100mV4k Circuit AFigure 1. Equivalent Circuits2k 750 VPOSVMAG(VPHS)CLASS A-BCONTROL25 COMMC ircuit BVPOS10k 5k VREFCOMMC ircuit CVPOSMSET(PSET)ACTIVE LOADS10k 10k COMMC ircuit DMFLT(PFLT) EREV. B AD8302 6 Typical Performance CharacteristicsMAGNITUDE RATIO 30 VMAG 25 20 15 10 5 0 5 1015202530190090010027002200 TPC 1. Magnitude Output (VMAG) vs. Input Level Ratio( gain ) VINPA/VINPB, Frequencies 100 MHz, 900 MHz,1900 MHz, 2200 MHz, 2700 MHz, 25 C, PINPB = 30 dBm,(Re: 50 )MAGNITUDE RATIO 30 VMAG 25 20 15 10 5 0 5 1015202530900100220019002700 TPC 2.