IEEE Journal of Solid-State Circuits · 1984 · 38 citations · 4 references
EngineeringElectrical EngineeringAnalog ElectronicsMicroelectronicsSemiconductor DevicesAnalog Integrated CircuitsAnalog IntegrationCmos Circuit DesignMetal-oxide-semiconductor Field-effect TransistorsOperational AmplifiersSignal AmplificationClosed-loop GainCmos Operational AmplifiersDepletion-mode TransistorsGainOpen-loop GainOperational Amplifier CircuitsOperational Amplifier DesignResistors
A linear resistor has been realized by using NMOS depletion transistors operated in the triode region. While such a resistor is mainly intended for single-ended and first quadrant mode of conduction, where it achieves a nonlinearity of .03% full scale in the 0-10 V voltage range, it can also be used as a floating element and operated in the first as well as third quadrant mode of conduction (i.e. with V and I both either positive or negative) with some degradation in linearity and voltage range. A linear noninverting amplifier with an accurately controlled gain of 16 has been realized by using a high open-loop gain (90 dB) operational amplifier and dimensioning the simulated resistors to set the closed-loop gain.
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