Fuding Ge's Circuit Design Ideas

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Welcome to Fuding Ge's

Design Ideas For

Low Voltage, Low Power, Low Noise
High Speed, High Resolution
PVT Insensitive

CMOS Analog/Mixed Signal ICs

Fuding Ge
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THERE IS ALWAYS A BETTER DESIGN !

What's new in this site ?
PLL and Delta Sigma Frequency
Synthesizer Presentation Slides (PDF file)

Basic building blocks (opamp, reference, etc.)
Phase-locked loops design
Clock Distribution Slides (PDF File)
Data converters (ADC, DAC) design
Filter design
Low power ideas
Noise analysis
ESD Protection Circuit Design
Layout and Physical Design Verifications
Special circuits collection
VHDL, VerilogA Modeling
RF Circuit, High Speed Circuit and High Frequency Device Modeling

Crystal Oscillator Presentation (PDF File).

DC-DC Converter

Some useful approximations:

For 0.4um process, the MOS capacitor is about 3fF/um^2; For 0.13um process this can be 12fF/um^2. For MiM cap, this value is about 1 - 1.5 fF/um^2. This is for quick area estimation

For modern process (0.25-0.13um), the transconductance of NMOS is about:

For thermal noise, 1 pF capacitor is about 64 uV. 1 KOhm resistor has a value of 4 nV/(Hz)^0.5; 50 Ohm is about 1 nV/(Hz)^0.5

Looking a job of analog/mixed signal IC design? Read the interview questions I was once asked and my job guide at this field.

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This page was last updated at Jan. 27, 2004