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GYRATOR COMPRISING VOLTAGE-CONTROLLED DIFFERENTIAL CURRENT SOURCES

  • US 3,758,885 A
  • Filed: 10/05/1972
  • Issued: 09/11/1973
  • Est. Priority Date: 10/09/1971
  • Status: Expired due to Term
First Claim
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1. Gyrator which comprises a first and a second voltagecontrolled differential current source, which current sources each include two input transistors and have two outputs, the control electrodes of the input transistors of the first differential current source also forming the inputs of the gyrator, whilst the control electrodes of the input transistors of the second differential current source also form the outputs of the gyrator, each of the outputs of the first differential current source being connected to an output of the gyrator, whilst each of the outputs of the second differential current source is connected to an input of the gyrator, at least one of the two inputs and both outputs of the gyrator being connected via high-resistance current sources to points of constant potential whilst each of the input transistors has a first and a second main electrode, characterized in that, at least in the second differential current source, a high-resistance current source is connected in each of the circuits between the first main electrodes of the two input transistors and a supply point, whilst each of the first main electrodes is connected via a current feedback path to the control electrode of a first transistor the main current path of which is connected in the circuit between the second main electrode of an input transistor and another supply point, the two outputs of the differential current source each being connected via the main current path of at least one auxiliary transistor to the second main electrode of the respective input transistor the main current path of which also forms part of the said circuit between the second main electrode of the respective input transistor and another supply point, means being provided to couple all the said highresistance current sources to the same current adjusting element.

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