Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
April 21, 2009
Patent Application Number
11946931
Date Filed
November 29, 2007
Patent Citations Received
Patent Primary Examiner
Patent abstract
An emitter follower circuit applies to an input terminal of a second amplifying device a voltage according to a reference voltage applied to a reference terminal. First and second resistors are connected in series between the reference terminal and an input terminal of a first amplifying device. The collector of a first transistor is connected to the reference terminal and a control voltage is applied to the base of the first transistor. A third resistor is connected between the emitter of the first transistor and a grounding point. A current mirror circuit draws a current proportional to a current input from the collector of the first transistor from a connection point of the first and second resistors.
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