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An All-Inversion-Region gm/ID Based Design Methodology for Radiofrequency Blocks in CMOS Nanometer Technologies
Abstract
This chapter presents a design optimization methodology for analog radiofrequency (RF) blocks based on the gm/ID technique and on the exploration of all-inversion regions (from weak inversion or sub-threshold to strong inversion or above threshold) of the MOS transistor in nanometer technologies. The use of semi-empirical models of MOS transistors and passive components, as inductors or capacitors, assures accurate designs, reducing time and efforts for transferring the initial block specifications to a compliant design. This methodology permits the generation of graphical maps to visualize the evolution of the circuit characteristics when sweeping both the inversion zone and the bias current, allowing reaching very good compromises between performance aspects of the circuit (e.g. noise and power consumption) for a set of initial specifications. In order to demonstrate the effectiveness of this methodology, it is applied in the design of two basic blocks of RF transceivers: low noise amplifiers (LNAs) and voltage controlled oscillators (VCOs), implemented in two different nanometer technologies and specified to be part of a 2.4 GHz transceiver. A possible design flow of each block is provided; resulting designs are implemented and verified both with simulations and measurements.
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