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162 Threads found on edaboard.com: Small Signal Model

A question related to a simple differential amplifier

It will remain the same. Nope. Try deriving using small signal model

How do you find gain of a CS stage (say) if MOSFET is in linear region?

You can derive small signal parameters (e.g. gm and ro) for any MOSFET operation point, but the parameters are different.

Relationship between inductor and transmission line (or long wire)

Hi I'm confused about the basic stuffs Please see the following steps and check if it's correct 1) a wire has an inductance 2) longer wire has higher inductance 3) an electrically long wire is a transmission line 4) therefore, an inductor = kind of a transmission line A lossless tranmission line small signal model has a series (...)

how to do small signal model for pHEMT

pHEMPT is described by S parameters for specific frequency band. To convert S parameters to spice model you can use EMwonder software. But I think ADS may have subcircuit that accept S parameters for such analysis. S-parameters cnnot be converted to SPICE parameters due to their linear and small signal equiva

CMOS Transistor size ratio

please share the parameters for 90 nm cmos process drain current,small signal parameter and intrinsic gate capacitance parameters for 90 nm cmos process (T=300k)

linear voltage regulator model

Hello, attached you see a small signal model of a linear voltage regulator with two gain stages and a source follower output stage. From simulation I see that P2 is the dominant pole and P1 is the non dominant pole (P3 at high frequencies for small CL). But actually the miller effect should make p1 dominant and p2 non (...)

small signal model circuit

Hello everyone I need some help with draw small signal circuit for rail to rail input complementary input stage as in the image 126837. Thank you anyway

Simple question: Is Saleh model small signal/large signal?

I would like to model the static nonlinearity of a power amplifier. The ("small" signal) input is positive and negative at the operating point. So if I just use the tanh function I thought to get a good realistic approximation of saturation (for both, positive and negative values). However, being an odd-symmetric function, tanh only gener

Ring oscillator: small signal model

I couldn't figure out how they draw the small signal model for the ring oscillator above. The small signal model looks very strange to me. Why there is no gm of the first stage here? Why there is a current source sCgdV1? Why sCgd, 2sCgd? Why Cgs disappear. Here is the

How to get Vgs equation for MOSFET Small Signal Equivalent Model ?

Dear Friends, In attachment, I have shown two small signal Equivalent models of MOSFET for finding out Vgs. In First small signal Equivalent model of MOSFET, I have found out Vgs = Vg= (Vin R1//R2)/(Rg+R1//R2), because R1//R2 parallel with the Vin and Rg. (...)

Calculating Vout/Vin of a circuit

How do I calculate Vout/Vin of this arrangement: 121875 I have to do this using the small signal model, I am a beginner level electronics student so a complete explanation would be nice.

Using s-parameter for simulation in pspice

The s-parameters being a small signal analysis can be easily calculated using any spice by means of AC analysis. The question is - the mos model you are using for LNA simulation is valid for RF range ? You can refer the application note to know how to calculate s-parameter using pspice -

Simplified BJT model question (sedra smith)

The circuit diagram in post#1 is a LINEAR small-signal circuit. Therefore, you can apply the superposition method. It`s one of the fundamental laws which is used to calculate the voltage-current distribution in a circuit with more than one sources.

simulation error help

i am getting this error on simulation= unable to access library: nxp_rf_smallsignal help me out ...how to solve it

Need document for Small signal Noise equivalent model for CMOS and pHEMT Transistors

Dear Friends, I have searched lot in the google, I couldn't get it. I request you to show me document for the small signal noise equivalent model for CMOS transistor and HEMT transistor. If you know somebody, complete analysis document for the noise small signal equivalent (...)

Distributed Amplifier Design

If you use small signal s-parameter model of the transistors, it will give you a Gain. You used non-linear models that need bias circuit.

Power Spectral Density (psd) Function in cadence

Hi, Using cadence ADE calculator , there is a psd function. First you need to carryout transient simulation and then apply it to the signal. However, this may result with a long simulation time, and creating in equivalent small signal model might be useful. Good Luck !

Using "PSPICE" software, Can we generate equivalent CKT and Obtain desired Parameter

I downloaded and installed the Student Version Electronics Lab "PSPICE" software. I have the following doubts regarding on the "PSPICE" software (1) From " PSPICE" software, can we import our normal electronic circuit and convert it into equivalent circuit for small signal analysis. (2) If we import our small (...)

biasing for power amplifier and checking s-parameter at o/p port

You cannot obtain AC voltages and current in s-parameters simulations.You may just see small signal input/output relations between the ports. You have to do either HB simulation or Transient Simulation with a proper nonlinear model.If you use ADS, there is a Design Guide for Large signal Test Benches for E-Class Power (...)

Anybody ever tried Basso's PWMVM model in simulation?

I am trying to do simulation with Basso's model and find some interesting problem. Unlike Ridley derived small signal model for ac simulation , Basso uses a uniform model in all dc, ac and transition simulation. I tried and found some strange error in ac simulation. For example use PWMVM (...)