Van Ha Nguyen

9 Questions 23 Answers 0 Followers

Questions related from Van Ha Nguyen

Is there a generalized method to derive current-mode model of any DC-DC converters?

Hi all, As new DC-DC converters are being proposed, associated control method should be proposed and based on the small-model signal analysis of the DC-DC converters. Using average space state...

07 January 2021 7,524 3 View

"Safe" value of Vgs in sub-threshold design (4.5nUT < Vgs - Vth < -2nUT)?

Hello, Usually, by biasing Vgs < Vthreshold of MOSFET, we can push MOS into sub-threshold region. My curious question is: How much value of Vgs is "good" as a "rule of thumb"? I have referenced...

30 December 2019 9,252 1 View

Which paper/book is best to study sub-threshold operation and model of MOSs devices?

Dear all, There are lots of published work on sub-threshold operation and models of MOS devices (example: on Journal of Solid-State Circuits, IEEE). For a good and highly-credited one, could you...

09 December 2019 6,151 5 View

Stability analysis of DC-DC converter in Cadence using SpectreRF (PSS/PCA or PSS/PTSB)

Hi, I am designing the DC-DC converter (Buck) in Cadence. The compensation has been calculated and the simulation in time domain is very okay at different load/line conditions. In order to verify...

08 July 2017 3,163 11 View

Should the inductor and capacitor should be measured before simulating DC-DC converter in Cadence?

In design of DC-DC converters (buck, boost, buck-boost), selecting proper values of inductor and capacitor of power stage are important for determining the performance of overall system. In the...

22 June 2017 7,611 3 View

Surges in dead-time of PMOS and NMOS power switches (Buck converter) - How to solve it?

There are surges in the current of PMOS and NMOS during dead-time (as in the attached figure). I have several questions: - First, is it serious or bad in my design? And if it is not good, how to...

18 June 2017 1,787 3 View

Efficiency calculation of DC-DC Converters - Average value or RMS value?

For the efficiency calculation of dc-dc converter (In Cadence environment), I am still wondering whether to use Average or RMS value? They give different results. Some of publications and books...

05 May 2017 1,552 10 View

Any opinion about the choise of opamp topology used in design of LDOs?

Dear all, In design of Low Drop-out Voltage Regulator (LDO), what type of opamp should be used? I usually design LDO with folded cascode opamp and it seems to get matched with the...

04 October 2016 9,903 3 View

Ratio between Mobility of PMOS and NMOS?

Dear, I am working on several CMOS processes. I have also checked the product of Cox and Mobility of NMOS and PMOS transistors. Usually, the ratio between Cox*Mobility of NMOS and Cox*Mobility of...

02 October 2016 4,319 4 View