Low power systems for wireless microsensors
ISLPED '96 Proceedings of the 1996 international symposium on Low power electronics and design
Efficient modeling of integrated narrow-band low noise amplifiers for design space exploration
GLSVLSI '06 Proceedings of the 16th ACM Great Lakes symposium on VLSI
Particle swarm approach for parameter optimization of quantum well nano structure
Expert Systems with Applications: An International Journal
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The paper reports a small-signal model of a cascaded, packaged, CMOS low noise amplifier (LNA) operating in subthreshold region. The proposed compact model has been verified through CADENCE simulations in standard 0.18@mm process. This model also accounts for the dominating role of some of the device parasitic capacitances in determining the input impedance of the amplifier. The closed form expression of the input impedance obtained-from this model is then used for synthesizing the input matching network of the common-source LNA using standard Q-based technique. It has been noted that the conventional Q-based matching approach does not provide symmetric matching characteristics (S"1"1) about the center frequency (900MHz). To overcome this problem, a swarm intelligence-based evolutionary technique has been adopted for synthesis of the matching network. Symmetric nature is obtained both in terms of S"1"1 as well as the real/imaginary parts of the input impedance.