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 Stabilizing a 2Stage Amplifier
 Gm/ID versus IC
 Go Moderate
 The Calculation of Phase Margin
 Gm/IdDesign Methodology
 Brief Study of NoiseShaping SAR ADC – Part C
 Brief Study of NoiseShaping SAR ADC – Part B
 Brief Study of NoiseShaping SAR ADC – Part A
 Noise Effect On The Distribution of ADC Output Codes
 Noise Effect On The Probability of Comparator Decision
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Author Archives: Dai
Stabilizing a 2Stage Amplifier
To stabilize an amplifier is not an easy task. At least for me, I used to be a spice slaver — mechanically change some components’ parameter and run a simulation to check the result, and again and again and again … until … Continue reading
Posted in Analog Design
Tagged 2stage folded cascode, Ahuja compensation, Miller compensation, Stability
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Gm/ID versus IC
According to the EKV model, the inversion coefficient, IC, is defined by the ratio of drain current to a specified drain current, IDSspec, where VGSVT = 2n*kT/q [1]. In order to know the IC, I have to set up a separate testbench to … Continue reading
Posted in Analog Design, MOS Models
Tagged EKV, gm/ID, Inversion Coefficient, moderate inversion
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Go Moderate
Either Prof. Sansen’s inversion coefficient (IC) approach or Prof. Murmann’s Gm/Id design methodology is telling the same story of poweraware analog design. With the help of Gm/Id design kit, I can easily visualize the transistor performance as a function of its gatesource voltage … Continue reading
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
Gm/IdDesign 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 – SquareLaw Equation … Continue reading
Brief Study of NoiseShaping SAR ADC – Part C
The topic of noiseshaping SAR ADC will come to an end in this post. In Part A, I briefly talked about the concept of noise shaping applied to sigmadelta modulators. In Part B, I introduced one special property of SAR … Continue reading
Brief Study of NoiseShaping SAR ADC – Part B
In the previous post, I’ve shared some basics of sigmadelta ADC. In this post, before we look at the noiseshaping SAR ADC, let’s again do a warmup. The zdomain linear model for a 1storder sigmadelta modulator: The linear model has … Continue reading