Invention Grant
US06608502B2 Compact transmitter detection circuit with a wide dynamic range 失效
紧凑型发射机检测电路具有宽动态范围

  • Patent Title: Compact transmitter detection circuit with a wide dynamic range
  • Patent Title (中): 紧凑型发射机检测电路具有宽动态范围
  • Application No.: US10124129
    Application Date: 2002-04-17
  • Publication No.: US06608502B2
    Publication Date: 2003-08-19
  • Inventor: Kazuharu AokiJiro Kikuchi
  • Applicant: Kazuharu AokiJiro Kikuchi
  • Priority: JP2001-120090 20010418
  • Main IPC: G01R1900
  • IPC: G01R1900
Compact transmitter detection circuit with a wide dynamic range
Abstract:
A transmission signal which is output from a power amplifier is rectified by a first rectifying circuit and is then input to a first transistor of a voltage-to-current converting circuit, while the reference voltage is output from a second rectifying circuit and is then input to a second transistor of the voltage-to-current converting circuit. The output current of the first transistor is subtracted from the output current of the second transistor via a first current-mirror circuit, and a current that is proportional to the output voltage of the power amplifier is caused to flow to a two-terminal p-n junction electronic device. Then, a voltage that is proportional to the logarithm of the current is output from across the p-n junction electronic device.
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