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The input stage of an operational or transconductance amplifier could be a common-source amplifier and it should be designed carefully, since it contributes in a significant way to the performance of the entire cell. In this document, we show the results of analysing a basic transconduction cell based on the multiple-input ffioating-gate transistor in a common-source amplifier configuration. A particular feature of the cell that we analyse is that it contains a feedback loop towards one of the coupled gates that serves to improve the linearity. This simple cell could be a input stage in more complex circuits. We present studies of linearity, gain, output resistance and distortion to be compared with an entirely MOS common-source amplifier. Experimental tests were conducted based on an implemented integrated circuit. In our comparison, we note that the cell based on the ffioating-gate transistor has a remarkable linearity in conditions in which the MOS version would not operate properly. In addition, we experimentally observe the phenomena predicted by the theory, such as gain and operation point manipulation, according to the values of the voltages at the other control gates. Thus, it is possible to improve the design of operational amplifiers, and other similar circuits, because they provide greater linearity and less distortion; however, we observed lower transconductance and an increase in the output resistance.

Analysing a common-source amplifier implemented with floating-gate transistors and coupled feedback loop