Offset cancelling circuit

Remco J. Wiegerink, Evert Seevinck, Wim de Jager

    Research output: Contribution to journalArticleAcademic

    11 Citations (Scopus)
    160 Downloads (Pure)

    Abstract

    A monolithic offset cancelling circuit to reduce the offset voltage at an integrated audio-amplifier output is described. This offset voltage is detected using a low-pass filter with a very large time constant for which only one small on-chip capacitor is needed. The circuit was realized with a bipolar cell-based semicustom array. Measurements have shown that a -3-dB bandwidth below 5 Hz can be realized with a capacitor value of 50 pF. The resulting offset voltage at the audio-amplifier output was 2.5 mV. The offset cancelling circuit increases the wideband noise voltage at the audio-amplifier output by 0.15-MV RMS over the frequency range of 10 Hz to 30 kHz. The use of the offset cancelling circuit eliminates the need for a large external electrolytic capacitor. If an audio amplifier with a single supply voltage is used, a second electrolytic capacitor, needed to obtain a stable reference at half the supply voltage, can be eliminated
    Original languageUndefined
    Pages (from-to)651-658
    JournalIEEE journal of solid-state circuits
    Volume24
    Issue number3
    DOIs
    Publication statusPublished - 1989

    Keywords

    • IR-55765

    Cite this

    Wiegerink, Remco J. ; Seevinck, Evert ; de Jager, Wim. / Offset cancelling circuit. In: IEEE journal of solid-state circuits. 1989 ; Vol. 24, No. 3. pp. 651-658.
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    author = "Wiegerink, {Remco J.} and Evert Seevinck and {de Jager}, Wim",
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    Offset cancelling circuit. / Wiegerink, Remco J.; Seevinck, Evert; de Jager, Wim.

    In: IEEE journal of solid-state circuits, Vol. 24, No. 3, 1989, p. 651-658.

    Research output: Contribution to journalArticleAcademic

    TY - JOUR

    T1 - Offset cancelling circuit

    AU - Wiegerink, Remco J.

    AU - Seevinck, Evert

    AU - de Jager, Wim

    PY - 1989

    Y1 - 1989

    N2 - A monolithic offset cancelling circuit to reduce the offset voltage at an integrated audio-amplifier output is described. This offset voltage is detected using a low-pass filter with a very large time constant for which only one small on-chip capacitor is needed. The circuit was realized with a bipolar cell-based semicustom array. Measurements have shown that a -3-dB bandwidth below 5 Hz can be realized with a capacitor value of 50 pF. The resulting offset voltage at the audio-amplifier output was 2.5 mV. The offset cancelling circuit increases the wideband noise voltage at the audio-amplifier output by 0.15-MV RMS over the frequency range of 10 Hz to 30 kHz. The use of the offset cancelling circuit eliminates the need for a large external electrolytic capacitor. If an audio amplifier with a single supply voltage is used, a second electrolytic capacitor, needed to obtain a stable reference at half the supply voltage, can be eliminated

    AB - A monolithic offset cancelling circuit to reduce the offset voltage at an integrated audio-amplifier output is described. This offset voltage is detected using a low-pass filter with a very large time constant for which only one small on-chip capacitor is needed. The circuit was realized with a bipolar cell-based semicustom array. Measurements have shown that a -3-dB bandwidth below 5 Hz can be realized with a capacitor value of 50 pF. The resulting offset voltage at the audio-amplifier output was 2.5 mV. The offset cancelling circuit increases the wideband noise voltage at the audio-amplifier output by 0.15-MV RMS over the frequency range of 10 Hz to 30 kHz. The use of the offset cancelling circuit eliminates the need for a large external electrolytic capacitor. If an audio amplifier with a single supply voltage is used, a second electrolytic capacitor, needed to obtain a stable reference at half the supply voltage, can be eliminated

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    JO - IEEE journal of solid-state circuits

    JF - IEEE journal of solid-state circuits

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