Title:
【発明の名称】マイクロウェーブアクティブソリッドステート コールド/ウォームノイズソース
Document Type and Number:
Japanese Patent JP2001506756
Kind Code:
A
Abstract:
A microwave active noise source and method used for calibrating a radiometer includes a transistor configured as a noise equivalent model having a gate port, drain port and source port. During calibration of the radiometer the drain port is terminated and a bias circuit applies DC bias to the noise equivalent model. The bias circuit controls the DC bias such that a hot thermal radiation temperature and a cold thermal radiation temperature are alternately generated at the gate port of the noise equivalent model. A source inductance coupled to the source port of the noise equivalent model provides series feedback. To match the impedances in the noise source, an output matching impedance network is connected to the drain port and an input matching impedance network is connected to the gate port of the noise equivalent model. The input matching impedance network includes an input port for outputting the hot and cold thermal radiation temperatures used to calibrate the radiometer.
Inventors:
Lauder Robert S.
Smith Matthew Sea.
Smith Matthew Sea.
Application Number:
JP52768498A
Publication Date:
May 22, 2001
Filing Date:
November 13, 1997
Export Citation:
Assignee:
Raytheon Company
International Classes:
G01J1/10; G01J5/10; G01J5/46; G01K11/00; G01R35/00; G01K15/00; G01R29/08; H03B29/00; H03B5/18; (IPC1-7): G01R29/08; G01J1/10; G01R35/00
Attorney, Agent or Firm:
Eiji Saegusa (8 others)