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 Memos on FFT With Windowing
 Capacitor as a DiscreteTime Resistor
 A Brief Review On the Orders of PLL
 Stabilizing a 2Stage Amplifier
 Gm/ID versus IC
 Go Moderate
 The Calculation of Phase Margin
 Gm/IdDesign Methodology
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Category Archives: Analog Design
Capacitor as a DiscreteTime Resistor
Prof. Ali has a column called “Circuit Intuitions” in the IEEE SolidState Circuits Magazine. This time he wrote about capacitor as a resistor, which is quite helpful for me to understand this property recognized by James Clerk Maxwell 140 years … Continue reading
A Brief Review On the Orders of PLL
The simplest PLL, as is shown in Fig.1, consists of a phase detector (PD) and a voltage controlled oscillator (VCO). Via a negative feedback loop, the PD compares the phases of OUT and IN, generating an error voltage that varies … Continue reading
Posted in Analog Design, Circuit Analysis
Tagged PLL, PLL phase error, PLL stability
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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