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1	A Design Basis for Composite Cascode Stages Operating in the Subthreshold/Weak Inversion Regions Waddel, Taylor Matt 28 January 2012 (has links) (PDF) Composite cascode stages have been used in operational amplifier designs to achieve ultra-high gain at very low power. The flexibility and simplicity of the stage makes it an appealing choice for low power op-amp designs. Op-amp design using the composite cascode stage is often made more difficult through the lack of a design process. A design process to aid in the selection of the MOSFET dimensions is provided in this thesis. This process includes a table-based method for selection of the widths and lengths of the MOSFETs used in the composite cascode stage. Equations are also derived for the gain, bandwidth, and noise of the composite cascode stage with each of the devices operating in the various regions of inversion. composite cascode weak moderate strong subthreshold inversion level low power operation high gain low frequency low noise Electrical and Computer Engineering
2	A High-Gain, Low-Power CMOS Operational Amplifier Using Composite Cascode Stage in the Subthreshold Region Singh, Rishi Pratap 15 March 2011 (has links) (PDF) This thesis demonstrates that the composite cascode differential stage, operating in the subthreshold region, can form the basis of a high gain (113 dB) and low-power op amp (28.1 µW). The circuit can be fabricated without adding a compensation capacitance. The advantages of this architecture include high voltage gain, low bandwidth, low harmonic distortion, low quiescent current and power, and small chip area. These advantages suggest that this design might be well-suited for biomedical applications where low power, low noise bio-signal amplifiers capable of amplifying signals in the millihertz-to-kilohertz range is required. high gain low power low noise low distortion composite cascode stage subthreshold operation strong inversion moderate inversion weak inversion operation amplifier Electrical and Computer Engineering

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A Design Basis for Composite Cascode Stages Operating in the Subthreshold/Weak Inversion Regions

A High-Gain, Low-Power CMOS Operational Amplifier Using Composite Cascode Stage in the Subthreshold Region