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VOLTAGE-CONTROLLED CURRENT SOURCE

  • US 20060125463A1
  • Filed: 06/10/2005
  • Published: 06/15/2006
  • Est. Priority Date: 12/09/2004
  • Status: Active Grant
First Claim
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1. A voltage-controlled current source for receiving a control voltage and using the control voltage to control an output current, the voltage-controlled current source comprising:

  • an operational amplifier having a first input terminal for receiving the control voltage;

    a first transistor, wherein a gate terminal of the first transistor is coupled to an output terminal of the operational amplifier and a first source/drain terminal of the first transistor is coupled to a second input terminal of the operational amplifier;

    a resistor, wherein one terminal of the resistor is coupled to a first voltage line and the other terminal of the resistor is coupled to the first source/drain terminal of the first transistor; and

    a current mirror having a reference side input terminal and an output side output terminal, wherein the reference side output terminal is coupled to a second source/drain terminal of the first transistor and the output side output terminal outputs the output current.

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