A CMOS OTA for HF filters with programmable transfer function

Eric J. van de Zwan, Eric A.M. Klumperink, E. Seevinck, Evert Seevinck

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    A CMOS operational transconductance amplifier (OTA) for programmable HF filters is presented. When used in an OTA-C integrator, the unity-gain frequency phase error remains less than 0.3° for frequencies up to more than one tenth of the OTA bandwidth. The OTA has built-in phase compensation, which allows tuning of the transconductance of the OTA (Gm) while maintaining a small phase error. Since this phase error is preserved over the Gm range of the OTA, the OTA is suitable for filters with a programmable transfer function. Using stacked square-law transistors improves the linearity, DC-gain, and power-consumption properties of the OTA
    Original languageUndefined
    Pages (from-to)1720-1724
    Number of pages4
    JournalIEEE journal of solid-state circuits
    Issue number11
    Publication statusPublished - 1991


    • METIS-111630
    • IR-14486

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