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Basic Precautions for an Analog Designer
Ajay Kumar
Basic precautions and tips that an Analog Designer should know.
1. Minimum channel length of the transistor should be four to ve times
the minimum feature size of the process. We do it, to make the of
the transistor low i.e. the rate of change of Id w.r.t to Vds is low.
2. Present art of analog design still uses the transistor in the saturation
region. So one should always keep Vgs of the Transistor 30% above the
Vt.
3. One should always split the big transistor into small transistors having
width or length feature size 15m.
4. W/L Ratio of transistors of the mirror circuit should be less than or
equal to 5, to ensure the proper matching of the transistors in the
layout. Otherwise, it results to the Systamatic O set in the circuit.
5. One should make all the required pins in the schmetic before generating
the layout view. Because it's dicult to add a pin in the layout view.
All IO pins should be a metal2 pins whereas Vdd and Ground should
be metal1 pins.
6. One should rst simulate the circuit with the typical model parameters
of the devices. Since Vt of the trasistor can be anything between
Vt(Typical) 20%. So we check our circuit for the extreme cases i.e.
Vt + 20%, Vt
analog_basic_precau.pdf
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发表于 2008-7-9 22:55:48
