Category Archives: Analog Design

Go Moderate

Either Prof. Sansen’s inversion coefficient (IC) approach or Prof. Murmann’s Gm/Id design methodology is telling the same story of power-aware analog design. With the help of Gm/Id design kit, I can easily visualize the transistor performance as a function of its gate-source voltage … Continue reading

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The Calculation of Phase Margin

Negative feedback is ubiquitous, and the discussion on its stability can be found everywhere. For ease of reference, I will put a memo on the equations to calculate the phase margin. The amplifying system may includes multiple poles: . Neglecting higher … Continue reading

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Gm/Id-Design Methodology

Three times of entering a wrong password to access this site… Earlier in 2012, I wrote an introductory post about EKV model and later extended the related topic a little bit in another post – Stay Simple – Square-Law Equation … Continue reading

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Noise Effect On The Probability of Comparator Decision

In the previous post, it is explained why normal distribution with a standard deviation of  is used to characterize the circuit input-referred noise. In this post, we will calculate the probability of comparator decision (High or Low) with the existence of noise. We … Continue reading

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Normal Distribution and Input-Referred Noise

Normal distribution is frequently assumed when we do circuit analysis. Why? Because there is a saying that the sum of a large number of random variables converges to the Normal. Under what condition is this true? The central limit theorem deals with … Continue reading

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Shall We Go for ALL-Digital Solution?

I used to characterize myself as an analoger, enjoying the beauty found from Razavi’s analog CMOS book and Hastings’s layout art book. Then, I became worried of being a pure analoger, because it seems Moore’s law tries to push everything … Continue reading

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An Interesting Tutorial Given by Mr. Matching

Are you familiar with this seminal paper, titled “Matching Properties of MOS Transistors” with the first author Marcel Pelgrom? Yes! Pelgrom, the Mr. Matching! I happened to find an online tutorial dealing with component matching given by him from IDESA. … Continue reading

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