By K. Inieweski
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Extra resources for Wireless Technologies - Circuits, Systems, and Devices
Frequency range. Without this feedback, the power consumption is set by the lowest frequency of oscillation and the Q factor in this frequency range. Digital circuitry can also automatically select the proper VCO amplitude to meet the required phase noise specifications. This can result in power savings when operating with standards that do not have stringent phase noise requirements. ANALOG AND DIGITAL BASEBAND The simple RF front-end COGUR architecture needs a robust baseband to convert a large dynamic range analog signal into the digital domain.
Standard open-short de-embedding is used and found to be adequate * This is not a foregone conclusion as the performance of active devices at mm-wave frequencies is highly dependent on intrinsic and extrinsic device loss. 34 (a) Current gain and maximum power gain of a single transistor in the 130 nm technology node. Model extrapolated fmax is 135 GHz. (b) Optimized layout of NMOS transistor. (From Doan, C. , Niknejad, A. M. and Brodersen, R. , IEEE J. Solid-State Circuits, pp. 144–155, January 2005.
Digital and analog predistortion are strong candidates to enable operation at less power back-off while maintaining sufficient linearity. The average power levels of future mobile standards are likely to drop significantly. Power levels will drop in crowded urban areas as the cell size decreases and also to reduce blocking and potential interference to nearby users. This will certainly relax the requirements on the PA design. But the requirement to regulate the output power level adds new complexities to the PA design.
Wireless Technologies - Circuits, Systems, and Devices by K. Inieweski