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An auto-input-offset removing floating gate pseudo-differential transconductor

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3 Author(s)
T. G. Constandinou ; Dept. of Electr. & Electron. Eng., Imperial Coll. of Sci., Technol. & Med., London, UK ; J. Georgiou ; C. Toumazou

A floating-gate pseudo-differential transconductor is presented, in which the differential input signal is allowed to have a dc offset. Normally such an offset would render a normal CMOS differential pair useless. The circuit inherently removes any dc offset from the floating gates by feedback mechanisms involving Fowler-Nordheim electron tunneling and hot-electron injection. This technique can enable direct cascading of several cells without amplifying and accumulating offsets, or can be used to generate differential current mode signals from a single voltage source that has a dc offset, as with an electret microphone.

Published in:

Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on  (Volume:1 )

Date of Conference:

25-28 May 2003