Presentation 1 to Signal Processing & Mixed

Romano Torres 9th January 2013

DC/DC Converters  To convert a dc input voltage Vs into a dc output voltage

Vo;  To regulate the dc output voltage against load and line

variations;  To reduce the ac voltage ripple on the dc output voltage

below the required level;  To provide isolation between the input source and the

load; From reference [10]

Applications  Electronic devices:  Internal sub-circuits require different voltage levels;  Low battery voltage level needed.

 Photovoltaic panels:  Increase the voltage level of electric current produced.

Step-Down Buck Converter

Image from reference [10]

Step-Up Boost Converter

Image from reference [10]

Buck-Boost Converter

Image from reference [10]

Cuk Converter

Image from reference [10]

Transparency Resistors

Images from reference [5]

Capacitors

Transparent thin-film transistors  In 2003 appear the first successful reports of TTFT

using ZnO as channel layer material [1] [3] [8].  In 2004, K. Nomura et al. report the successful

fabrication of TTFT with a-GIZO (amorphous galliumindium-zinc-oxide) [9].

TTFT device structure

Staggered bottom-gate Image from reference [10]

TFT operation modes Cut-off:

Pre-saturation:

Saturation:

No current flow.

VgsVt

Vds>Vgs-Von

&

Vds