Analog.com Analog Dialogue Wiki 简体中文
EngineerZone
EngineerZone
  • Log In
  • Site
  • Search
  • User
  • Support

    Popular Forums

    • RF and Microwave
    • Power Management
    • Video
    • FPGA Reference Designs
    • Precision ADCs
    • Linux Software Drivers
    • SigmaDSP Processors & SigmaStudio Dev. Tool

    Product Forums

    • A2B
    • Amplifiers
    • Analog Microcontrollers
    • Clock and Timing
    • Data Converters
    • Direct Digital Synthesis (DDS)
    • Energy Monitoring and Metering
    • Interface and Isolation
    • MEMS Inertial Sensors
    • Processors and DSP
    • Switches/Multiplexers
    • Temperature Sensors
    • Voltage References
    View All

    Application Forums

    • Audio
    • Automated Test Equipment (ATE)
    • Condition-Based Monitoring
    • Depth, Perception & Ranging Technologies
    • Embedded Vision Sensing
    • Optical Sensing
    • Precision Technology Signal Chains
    • Video
    • Wireless Sensor Networks Reference Library

    Design Center Forums

    • ACE Evaluation Software
    • ADEF System Platforms
    • Design Tools and Calculators
    • FPGA Reference Designs
    • Linux Software Drivers
    • Microcontroller no-OS Drivers
    • Reference Designs
    • Signal Chain Power (SCP)
    • Software Interface Tools
    • System Demonstration Platform (SDP) Support
  • Learn

    Recent Discussions

    • Pluto + GNURADIO frequency change
    • Pluto SDR
    • pluto sdr pyadi-iio continous iq recording
    • attribute error
    • gps-sdr-sim is not working with my ADALM-PLUTO

    Places

    • ADI Education Home
    • ADI Education China
    • ADI Education India
    • ADI Education Philippines
    • StudentZone (Analog Dialogue)
    • Virtual Classroom

    Latest Webinars

    • Optimizing GaN and GaAs RF Amplifier Performance Using Novel Biasing Techniques
    • Webinar Improving Switch-Mode Power Supplies Using Noise Cancelling Technology
    • Webinar Accelerate Your Design With a 2 to 24 GHz Wideband Transceiver Reference Design
    • How to Design an Optimized Motion Control System for Intelligent Edge Based Surveillance Camera
    • How to Enhance High Precision Current Sensing Systems
    View All
  • Community Hub

    Challenge Yourself!

      KCC's Quizzes: Buffers and Fan Out
    View All

    Places

    • Community Help
    • Logic Lounge

    Resources

    • EZ Code of Conduct
    • Getting Started Guide
    • ADI: Words Matter
    • Community Help Videos
    View All
  • Blogs

     

    How To Design Fieldbus Agnostic Smart Factory Sensors

     

    You Passed EMC Testing… But Wait, Is There More?

    Latest Blogs

    • The 5 Things You Need to Know about RF Matching Networks
    • Does Reliability Prediction Uncertainty Justify Mandating Two Channel Safety?
    • An Inside Look at 2022
    • Meet the Person Behind the Quizzes
    • Updates Required: Why Newer is Better
    Read All Blogs

    ADI Blogs

    • EZ Spotlight
    • The Engineering Mind
  • Partners

    Electronic Design Services - PartnerZone

    • Boston Engineering
    • Calian, Advanced Technologies
    • Colorado Engineering Inc. (DBA CAES AT&E)
    • Clockworks Signal Processing
    • Epiq Solutions
    • Fidus
    • PalmSens
    • Richardson RFPD
    • Tri-Star Design, Inc.
    • VadaTech
    • Vanteon
    • X-Microwave
    View All
RF and Microwave
RF and Microwave
Documents FAQ: We have several AD8361s and all exhibit different levels of output voltage with no RF signal present. Is this normal?
  • Blogs
  • Forums
  • File Uploads
  • FAQs/ Docs
  • Members
  • Tags
  • More
  • Cancel
  • +Documents
  • +RF Switches & Attenuators: FAQ
  • +1/f noise of the ADL5387: FAQ
  • +1/f phase noise: FAQ
  • +AD608: FAQ
  • +AD8302: FAQ
  • +AD8309: FAQ
  • +AD8318: FAQ
  • +AD831: FAQ
  • +AD8340: FAQ
  • +AD8345: FAQ
  • +AD8347: FAQ
  • +AD8348 and ADL5387: FAQ
  • -AD8361: FAQ
    • AD8361 RMS Responding RF Detector - Overdrive Recovery
    • AD8361 Output Offset Voltage
    • FAQ: Operating RMS Detectors at Low Frequencies
    • FAQ: RF Detector Recommendations
    • FAQ: We have several AD8361s and all exhibit different levels of output voltage with no RF signal present. Is this normal?
  • +AD8362: FAQ
  • +AD8363: FAQ
  • +AD8364: FAQ
  • +AD8366: FAQ
  • +AD8368: FAQ
  • +AD8370: FAQ
  • +AD8375: FAQ
  • +AD9854 DDS: FAQ
  • +ADF4001: FAQ
  • +ADF4107: FAQ
  • +ADF4150: FAQ
  • +ADF4153: FAQ
  • +ADF4155: FAQ
  • +ADF4158: FAQ
  • +ADF4193: FAQ
  • +ADF41XX: FAQ
  • +ADF4350 and ADF4351: FAQ
  • +ADF4350: FAQ
  • +ADF4355-2: FAQ
  • +ADF4360-x: FAQ
  • +ADF5355: FAQ
  • +ADF7021-N: FAQ
  • +ADF9010: FAQ
  • +ADI's RF/IF gain blocks: FAQ
  • +ADIsimRF: FAQ
  • +ADL5240_ADL5243: FAQ
  • +ADL5330: FAQ
  • +ADL5336: FAQ
  • +ADL5370: FAQ
  • +ADL5373: FAQ
  • +ADL5375: FAQ
  • +ADL5380: FAQ
  • +ADL5385: FAQ
  • +ADL5390: FAQ
  • +ADL5511: FAQ
  • +ADL5535/6: FAQ
  • +ADL5601/2: FAQ
  • +ADL5602: FAQ
  • +ADL5801: FAQ
  • +ADL5802: FAQ
  • +ADL5902: FAQ
  • +ADRF6520: FAQ
  • +Auxiliary DACs: FAQ
  • +Calculating VSWR: FAQ
  • +CyUSB PLL: FAQ
  • +DAC/IQ Modulator Combination: FAQ
  • +dc bias level: FAQ
  • +Decoupling(Bypass) and AC-Coupling Capacitors: FAQ
  • +Footprint for ADI components: FAQ
  • +Fractional-N PLLs: FAQ
  • +Gerber files: FAQ
  • +High Voltage VCOs: FAQ
  • +Hittite Microwave RF/MW Amplifiers: FAQ
  • +Hittite PLL+VCO: FAQ
  • +Hittite PLLVCO: FAQ
  • +HMC Microwave Frequency Dividers: FAQ
  • +HMC Phase Frequency Detectors: FAQ
  • +HMC PLL's & PLLVCO: FAQ
  • +HMC-ABH241: FAQ
  • +HMC1020: FAQ
  • +HMC292A: FAQ
  • +HMC406MS8G: FAQ
  • +HMC451: FAQ
  • +HMC557A: FAQ
  • +HMC558A: FAQ
  • +HMC587LC4B: FAQ
  • +HMC589: FAQ
  • +HMC611LP4: FAQ
  • +HMC624ALP4E: FAQ
  • +HMC634LC4: FAQ
  • +HMC685LP4: FAQ
  • +HMC686LP4/686LP4E: FAQ
  • +HMC773ALC3B: FAQ
  • +HMC778LP6CE: FAQ
  • +HMC807LP6CE: FAQ
  • +HMC832LP6GE vs HMC830LP6GE: FAQ
  • +HMC909: FAQ
  • +Int-N PLL evaluation boards: FAQ
  • +IQ demodulator: FAQ
  • +IQ Modulators: FAQ
  • +LTC694x: FAQ
  • +OP-AMP: FAQ
  • +PLL USB adapter board: FAQ
  • +RF & Microwave: FAQ
  • +RF Connectors: FAQ
  • +RF Detector Overdrive: FAQ
  • +rms detector: FAQ
  • +S-Parameters: FAQ
  • +Standard S-Parameter Files: FAQ

FAQ: We have several AD8361s and all exhibit different levels of output voltage with no RF signal present. Is this normal?

Q.

We have several AD8361s and all exhibit different levels of output voltage without any RF signal present.  Is this normal?

-------------------------------------------------------------------------------------------------------------------------------------------------------------------

A.

In this context, offset is defined as the output voltage level that the detector exhibits when no RF input is present.

The figure below shows the distribution of the output response vs. the input power for multiple devices. Below an RF input power of −21 dBm, the response of the AD8361 is no longer linear and begins to lose accuracy (see also figures 9 and 10 of the data sheet).  As the input power is reduced, the spread of the output response increases along with the error.

Although some devices follow an ideal linear response at very low input powers, not all devices continue the ideal linear regression to a near 0 V y-intercept. Some devices exhibit output responses that rapidly decrease and some flatten out.  With no RF signal applied, the AD8361 has a typical output offset of less than 200 mV.

If calibration is possible, then it is recommended that points be used in the linear region of the device, avoiding the nonlinear range at low extremes (or the high extreme where saturation is an issue).  The AD8361 is accurate from about -20 dBm to 10 dBm (depending on supply, as shown in the data sheet).

Fortunately, despite having the device response fan out at the low power levels (i.e. follow the ideal, rapidly decrease, or flattened out), the response curve of the AD8361 remains monotonic.  The response follows a strictly increasing function and is even increasing (slowly) in the low power, nonlinear range.  This behavior permits level shifting as a way to hide the offset by moving the curve down (offset being held under GND) by way of an op-amp.

Derivative products follow similar offset behavior with typical output offset of less than 150 mV (ADL5500, ADL5501) or 100 mV (ADL5502, ADL5504, ADL5505).

  • adl5501
  • adl5504
  • adl5502
  • adl5505
  • ad8361
  • adl5500
  • Share
  • History
  • More
  • Cancel
Related
Recommended
 
Social
Quick Links
  • About ADI
  • Partners
  • Analog Dialogue
  • Careers
  • Contact us
  • Investor Relations
  • News Room
  • Quality & Reliability
  • Sales & Distribution
  • Analog Garage
Languages
  • English
  • 简体中文
  • 日本語
  • Руccкий
Newsletters

Interested in the latest news and articles about ADI products, design tools, training and events? Choose from one of our 12 newsletters that match your product area of interest, delivered monthly or quarterly to your inbox.

Sign Up
Switch to mobile view
Analog Logo
© 1995 - 2023 Analog Devices, Inc. All Rights Reserved 沪ICP备09046653号-1
  • ©
  • 1995 - 2023 Analog Devices, Inc. All Rights Reserved
  • 沪ICP备09046653号-1
  • Sitemap
  • Privacy & Security
  • Privacy Settings
  • Terms of use
EngineerZone Uses cookies to ensure you get the best experience in our community. For more information on cookies, please read our Privacy & Security Statement.