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Recent content by finalvolition

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    PLL transistor-level design

    For a beginner, the textbook by Razavi is very helpful.
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    what is hot topics in analog design research?

    low voltage / deep-submicro AD/DA/PLL they suffer process limits such as leakage or modeling accurace
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    Bandgaps output value changes from chip to chip!

    About Bandgap It depend on fab process and your design. Basically, using larger device size can avoid variation due to Vt .
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    How to do PFD simulation ?

    simulation about PFD yes, it usually simulated with charge pump circuit combined. such as reset delay
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    How to perform FFT analysis

    you cna .fft syntax in HSPICE manual fft is based on DFT, so you need to take care about transient step for consistence to resolution. Generally speaking, Fres (frequency resolution) is smaller with long simulation time due to larger window size. The analyzed frequency range is up to NP* fres (...
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    Testing a Start-up Circuit

    About the method by ramp up supply, it is not exactly confirmed if the circuit can work. It is because the node is unknow when power ramp up. The method to ensure if it works is to keep supply constant(VDD) as well as set initial conition at critical point to have zero initial current.

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