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Circuit-Level Considerations for Mixed Signals Programmable Components

Luigi Carro

This paper presents some architectural studies regarding mixed signals Programmable Components (FPGAs em Gate Arrays). The effect of programmability through the use of switches is analyzed, and it is shown that the result is a transfer function modification when real characteristics of the switches are assumed. Moreover, the paper proposes the use of externally linear, internally non-linear analog circuits, since this procedure could eliminate the error introduced by the switches. Using this approach, analog area is greatly reduced, and circuits can be built on top of digital technologies. Some experimental results in the analog and digital domain support the proposed approach to mixed circuits reprogrammability, being the basis for a mixed signal FPGA.

http://csdl.computer.org/dl/proceedings/sbcci/1999/0387/00/03870106.pdf

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