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Input switch configuration suitable for rail-to-rail operation of switched opamp circuits

Input switch configuration suitable for rail-to-rail operation of switched opamp circuits

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A switch configuration to be used at the input of switched opamp circuits is introduced. The circuit is an extension of the gate-source bootstrapping technique such that rail-to-rail operation of the input switch becomes possible. Simulations show the usefulness of the proposed circuit down to 0.9 V.

References

    1. 1)
      • J. Crols , M.S.J. Steyaert . Switched-opamp: An approach to realize fullCMOS switched-capacitor circuits at very low power supply voltages. IEEE J. Solid-State Circuits , 8 , 936 - 942
    2. 2)
      • Ferri, G., Costa, A., Baschirotto, A.: `A 1.2 V rail-to-rail switched buffer', Proc. ICECS, 1998, Lisbon, Portugal, p. 45–48.
    3. 3)
      • B. Brandt , P.F. Ferguson , M. Rebesehini , S.R. Norsworthy , R. Schreier , G.C. Temes . (1997) Analog circuit design for ΔΣADCs, Delta-sigma data converters.
    4. 4)
      • A. Baschirotto , R. Castello . A 1 V 1.8-MHz CMOS switched-opamp SC filterwith rail-to-rail output swing. IEEE J. Solid-State Circuits , 12 , 1979 - 1986
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