Mixed-Signal-Electronics - Lehrstuhl für Technische Elektronik - TUM
Mixed-Signal-Electronics - Lehrstuhl für Technische Elektronik - TUM
Mixed-Signal-Electronics - Lehrstuhl für Technische Elektronik - TUM
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Constraints of <strong>Mixed</strong> <strong>Signal</strong> Circuits in SoC<br />
PROS CONS<br />
• Cheap implementation of complex<br />
signal processing tasks<br />
• System-on-chip (SOC)<br />
Small pcb footprint<br />
• Fast time reference/clock<br />
• Digitally assisted analog<br />
• All advantages of digital<br />
systems, e.g. robustness, noise<br />
immunity, data storage,<br />
reconfigurability, efficient highly<br />
automated design and test<br />
Henzler, Schmitt-Landsiedel <strong>Mixed</strong>-<strong>Signal</strong>-<strong>Electronics</strong> 2011/12<br />
• Need to build analog circuits in<br />
digital process, i.e.<br />
• Devices optimized for high<br />
switching speed not for analog,<br />
(e.g. small gm/gds)<br />
• Transistors with high field<br />
and short channel effects<br />
µ(V G), V th(W,L,V DS,V BS), I gate, I DB<br />
• <strong>Signal</strong> contamination due to digital<br />
switching noise, e.g. cross talk,<br />
supply noise substrate coupling<br />
• several 100mA digital currents<br />
• V analog signals<br />
15
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