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A 0.13µm CMOS ΔΣ PLL FM Transmitter

A short range FM transmitter is presented. It uses an architecture where the output frequency of a phase locked loop (PLL) is modulated by varying the division number of the feedback divider, using the 1-bit output of a ΔΣ ADC. The measured total harmonic distortion (THD) plus noise is less than 1% at 75 kHz deviation. The transmitter is fully integrated in a 0.13µm CMOS process and the core area

Adapting a causality model of technical systems to represent socio-technical systems: A Case study from the BoP

The base of the world economic pyramid, generally called the base of the pyramid (BoP), consists of four billion people with average daily income of four dollars. Over the past several years, the design and development of products and services for BoP markets has been investigated by several authors from different disciplines. While some authors suggest a systems approach to design and develop pro

Alternative agriculture and rural development: A case study of sugar beet cultivation in Kenya

Land use change has been observed to cause profound impacts on sustainability, particularly when the change is not well planned and co-coordinated. In Kenya the government is promoting diversification of crops to embrace high value crops and drought resistant crop varieties in efforts to reduce poverty in rural areas. Sugar beet is one of the crops considered as an option in this context. Adoption