Trimming Techniques for Area Effective Modulation Circuits

Social, apps, cloud technology have in common the management of a lot of information that must be stored. Hard disks are devices used for long-term storage of data and represent the most viable and cost-effective solution to fulfill the ever growing data storage demands. This work revolves around new techniques to increase the data density and therefore the storage capacity of new generation hard disks, in particular focusing our attention on area effective architectures for the analog periphery of HAMR systems. In the first chapter, a brief overview of the evolution of hard drive disks will be presented, with the main focus on HAMR technology. The second chapter deals with an overview on Laser Driver Architectures: presenting different solutions and issues, besides to collateral functionalities as laser current modulation. After a brief introduction on the trimming techniques, the chapter describes our proposed solution based on current steering techniques, highlighting strengths and weaknesses. The fourth chapter deals with the design activity of different configurations validated via simulations and presents the obtained results. The fifth chapter defines the layout critical aspects and presents a preliminary floorplan of the proposed architecture.

Tecniche di Trimming per la riduzione di area nei circuiti di modulazione