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A threshold voltage tunable op-amp structure that can be operated with a very low power supply is presented. Use of floating gate MOS transistors as the basic op-amp circuit element makes it possible to obtain a very low voltage op-amp because of the threshold voltage adjustability of the floating gate transistors. Good matching can also be achieved by tuning the threshold voltages. A two-step threshold voltage tuning scheme is presented. Due to the long term charge retention property of the floating gate transistors, the threshold voltage tuning does not have to be done frequently, and thus, near continuous-time operation of the op-amp can be achieved.

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