A CMOS Wideband Linear Current Attenuator with Electronically Variable Gain

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    A CMOS highly linear current attenuator is described. The circuit is suited for both differential and single input currents. The current gain is electronically variable between -1 and +1 by means of two controlling currents. A simple additional circuit is described to obtain a gain that is linearly dependent on a single control current. The circuit can be used as a four-quadrant current multiplier. The current attenuator is realized in a standard 2.5 μm CMOS process using channel lengths of 5 μm. The measured nonlinearity is less than 1% over the entire input current range. Simulations indicate a feasible -3dB bandwidth of over 100 MHz.
    Original languageUndefined
    Title of host publicationProceedings International Symposium on Circuits and Systems (ISCAS '93)
    Place of PublicationChicago, Illinois
    ISBN (Print)9780780312548
    Publication statusPublished - 3 May 1993
    EventIEEE International Symposium on Circuits and Systems, ISCAS 1993 - Chicago, Illinois
    Duration: 3 May 19936 May 1993

    Publication series



    ConferenceIEEE International Symposium on Circuits and Systems, ISCAS 1993
    Other3-6 May 1993


    • IR-15944
    • METIS-112826

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