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ABSTRACT
The use of ferroelectric materials for digital memory devices is widely researched and implemented, but ferroelectric devices also posses unique characteristics that made them have interesting and useful properties in analog circuits. Because ferroelectric transistors posses the properties of hysteresis and nonlinearity, an analog amplifier containing an FeFET has very different characteristics than one with a traditional FET. This paper characterizes the properties of a simple analog amplifier using both a traditional FET and a ferroelectric FET. The characterization includes voltage transfer, gain, frequency response, and operating modes. Because of the hysteresis effects the FeFET amplifier has two distinct operating modes, each with significantly different properties. These two regions have very different gain characteristics and are nonlinear. This has the effect of being able to program the FeFET to have two different voltage transfer/current characteristics with a single device. This can allow a flexible circuit that can change its analog properties on-the-fly with only a programming pulse. Modeled and measured data are presented showing the characteristics of this device. Comparisons are made between the ferroelectric device and the properties of a standard analog amplifier. Potential benefits and possible uses of such a device are presented.