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Feed back current-source circuit

  • US 6,690,229 B2
  • Filed: 12/18/2002
  • Issued: 02/10/2004
  • Est. Priority Date: 12/21/2001
  • Status: Expired due to Term
First Claim
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1. A current-source circuit in which a first and a second MOS field-effect transistor form a current mirror circuit, wherein a reference current is supplied to the first MOS field-effect transistor via a third MOS field-effect transistor receiving an input at the gate and connected in cascode and the drain electrode of a fourth MOS field-effect transistor connected to the second MOS field-effect transistor in cascode forms an output, characterized in that the source electrodes of the third (3) and the fourth (4) MOS field-effect transistors are connected to inputs of an automatic gain control amplifier (7), whose output is connected to the gate electrode of the fourth MOS field-effect transistor (4), in that the fourth MOS field-effect transistor (4) is an extended-drain MOS field-effect transistor and in that the drain electrode and the gate electrode of the fourth MOS field-effect transistor (4) are connected to one another via a further MOS field-effect transistor (10) whose gate electrode is acted on by an operating voltage for the circuit.

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