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Patent Searching and Data

Document Type and Number:
Japanese Patent JP5222267
Kind Code:
A current sense circuit which comprises, first, an output transistor having gate, source, and drain. The drain is coupled to a load, the source is coupled to a power rail, the gate is coupled to a control voltage such that the output transistor conducts an output current. Second, a sense transistor has gate, source, and drain. The source is coupled to the power rail and the gate is coupled to the control voltage. A sensing factor comprises the output transistor size divided by the sense transistor size. Third, a means of equalizing the sense transistor drain-to-source voltage and the output transistor drain-to-source voltage is used such that the sense transistor drain current comprises the output current divided by the sensing factor. Finally, a current controlled oscillator is included. The current controlled oscillator has input and output. The input comprises the sense transistor drain current. The output comprises a cyclical signal having a frequency proportional to the output current.

Application Number:
Publication Date:
June 26, 2013
Filing Date:
October 19, 2009
Export Citation:
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International Classes:
G01R19/00; G01R19/252; H03K3/02; H03K4/06; H03K7/08
Attorney, Agent or Firm:
社本 一夫
増井 忠弐
小林 泰
千葉 昭男
富田 博行
西山 文俊