{
  "patent_number": "US 8831529",
  "country": "US",
  "title": "How Smartphones Calibrate Their Radio Power Across Different Temperatures",
  "original_title": "Wireless communications circuitry with temperature compensation",
  "summary": "A method for testing and calibrating a phone's wireless radio performance in a temperature-controlled chamber to ensure it stays accurate as the device heats up or cools down.",
  "what_it_does": "This patent describes a factory-floor testing process that ensures a smartphone's radio remains consistent regardless of its internal temperature. During manufacturing, the device is placed in a temperature-controlled chamber and forced to transmit signals at various temperatures. The system measures how the power amplifier's output drifts at these different temperatures compared to a baseline. It then calculates specific offset values—essentially a correction table—that are stored on the device to help it adjust its power output dynamically during daily use.",
  "what_it_does_not_cover": [
    "Does not cover real-time, on-device temperature compensation that occurs without prior factory calibration data.",
    "Does not cover the physical design of the power amplifier circuitry itself.",
    "Does not cover software-based signal processing techniques that compensate for interference or noise.",
    "Does not cover calibration methods that rely solely on ambient room temperature without a specialized test chamber."
  ],
  "filed": "2012-04-30",
  "granted": "2014-09-09",
  "expires": null,
  "status": "active",
  "holder": "Apple Inc",
  "holder_url": "https://patentbrief.org/company/apple-inc",
  "inventors": [
    {
      "name": "Yuping Toh",
      "url": "https://patentbrief.org/inventor/yuping-toh"
    },
    {
      "name": "Anh Luong",
      "url": "https://patentbrief.org/inventor/anh-luong"
    }
  ],
  "times_cited": 47,
  "tags": [
    "consumer_electronics",
    "telecommunications",
    "semiconductors",
    "mechanical"
  ],
  "abstract": "A test system for calibrating wireless electronic devices is provided. The test system may include a test host, a radio communication tester, and a temperature chamber in which an electronic device under test (DUT) may be tested. The DUT may include a temperature sensor for monitoring an internal temperature of the DUT and may include power amplifier circuitry for outputting radio-frequency test signals. The tester may be used to measure output power levels of the radio-frequency test signals when the DUT is operating at a given reference temperature and when the DUT is operating at target operating temperature levels other than the given reference temperature. Power amplifier output level offset compensation values may be computed by comparing output power levels measured at each of the target operating temperatures to output power levels measured at the given reference temperature and may be stored in the DUT prior to normal operation.",
  "url": "https://patentbrief.org/patent/us/8831529/airplay-wireless-streaming",
  "markdown_url": "https://patentbrief.org/patent/us/8831529/airplay-wireless-streaming/md",
  "google_patents_url": "https://patents.google.com/patent/US8831529",
  "relatedPatents": []
}