Paul
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Vivek,
below a couple of references that may answer your question.
A low power OTA with adaptive biasing and common-mode compensation Zhiliang Hong; Yan Wang; Solid-State and Integrated Circuit Technology, 1995 4th International Conference on 24-28 Oct. 1995 Page(s):188 - 192
Power-efficient super class AB OTAs Lopez-Martin, A.; Baswa, S.; Ramirez-Angulo, J.; Carvajal, R.G.; Solid-State Circuits Conference, 2004. ESSCIRC 2004. Proceeding of the 30th European 21-23 Sept. 2004 Page(s):231 - 234
Low-voltage low-power adaptive biased high-efficiency integrated amplifiers Ferri, G.; Electronics, Circuits and Systems, 2001. ICECS 2001. The 8th IEEE International Conference on Volume 3, 2-5 Sept. 2001 Page(s):1529 - 1532 vol.3
A 900-mV low-power ΔΣ A/D converter with 77-dB dynamic range Peluso, V.; Vancorenland, P.; Marques, A.M.; Steyaert, M.S.J.; Sansen, W.; Solid-State Circuits, IEEE Journal of Volume 33, Issue 12, Dec. 1998 Page(s):1887 - 1897
900 mV differential class AB OTA for switched opamp applications Peluso, V.; Vancorenland, P.; Steyaert, M.; Sansen, W.; Electronics Letters Volume 33, Issue 17, 14 Aug. 1997 Page(s):1455 - 1456
Be careful with the adaptivity ratio and related bias stability issues.
Good luck,
Paul
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