01-12-2012, 01:38 PM
DATA CONVERTER FUNDAMENTALS
1DATA CONVERTER.pdf (Size: 2.85 MB / Downloads: 35)
Why data Conversion ?
Most real-world signals are analog in nature.
Real-world signals-Continuous time, Continuous
amplitude
However Digital signal processing allows us to
efficiently manipulate information.
Digital abstraction-discrete time, discrete amplitude
To take advantage of DSP we must be able to move
from Analog to digital and back as needed
Applications
Performance requirements such as resolution and bandwidth are
set by intended applications. faster speed and lower power.
Communications: Wireless transceivers, Modems
Computing and control: Imagers, displays, Multimedia
Measurement & Instrumentation: Test equipment, Industrial and
scientific Instrumentation, Sensors & actuators.
Consumer Electronics: Video/Audio, Control (Automotive,
Appliances, etc).
Embedded data Conversion
Mixed Signal layout Issues
Analog ICs are more sensitive to noise thane digital ICs
Layout issues are more in analog.
Sensitive analog nodes must be protected and shielded
from any potential noise sources.
Grounding and power supply routing must also be
considered when using digital and analog circuitry on
the same substrate.
Mixed-signal designs vary in complexity and priority.
Other Interconnect Considerations
When routing the analog circuitry, minimize the lengths
of current carrying paths.
Vias and contacts should also be used very liberally
whenever changing layers.
Avoid using poly to route current carrying signal paths
Use poly to route only high-impedance gate nodes that
carry virtually no current.