Van Ha Nguyen

10 Questions 17 Answers 0 Followers

Questions related from Van Ha Nguyen

"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...

12 December 2019 1,936 0 View

Discussion about True Random Number Generator (TRNG) - Chaos, noise, or quantum-based TRNG?

True random number generator (TRNG) for secure application in IoT has emerging as a hot topic nowaday (IoT devices + big data). For example in security of money transaction. There are many kind of...

06 June 2018 536 0 View

Voltage-mode controlled DC-DC Converter: Ramp or triangular generator for PWM?

"A time-varying piece-wise linear waveform is necessary for PWM operation. In the case of voltage mode control, a ramp signal is generated inside the controller and used for the time-varying...

09 September 2017 8,174 8 View

Load modelling: Using Resistor or current sink as a load?

I am confusing what is the different in modeling a load (unknown load). Some simulations model load as a pure resistor while the others use a current sink. I would like to know what is the...

09 September 2017 5,426 0 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...

06 June 2017 7,629 4 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...

06 June 2017 2,285 3 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...

10 October 2016 4,101 3 View

"Local feedback" concept in Opamp and OTA

Dear, In compensation networks, we use OTA and Opamp as EA in DC-DC converters (also another applications). The different between them is the physical connection of the compensation network with...

01 January 1970 2,215 2 View

Method of sizing power MOS switches in Power converter IC (integrated switches)?

In the design of power converter ICs, sometimes the power switches are not given by the PDK. That means we have to design the power transistors as the switches (NMOS and PMOS). Since the power...

01 January 1970 6,709 8 View

What are hot trends of CMOS analog integrated research topics in near future

I am curious what could be hot research/study topics in the fields related to CMOS integrated circuits (both analog and digital). My specific questions should be: 1. At device level: - What are...

01 January 1970 805 6 View