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# The Designers Guide

142 Threads found on edaboard.com: The Designers Guide

## Design broadband matching network for amp - beginner

See the followings.

## [Moved]: Simulation of H-paramters and cut off frequency of HBT transister in ADS

Is there any way to simulate the hybrid parameters of the HBT transistor in ADS ? or is there any function in ADS that can convert the s-parameters to h-parameters ? My second question is about cut-off frequency. In the common emitter configuration, how can we obtain ft vs Ic in ADS ? (...)

## Eye diagram formation

I have a question relating to how an eye diagram is built step by step. I read documents about eye diagram. 1. For ISI, the eye is formed by: superimposing successive waveforms to form a composite image But, i don't know based on what criteria they cut a certain waveform of falling an

## Nyquist stability criteria for MIMO systems

Is the above rule a sufficient condition for MIMO feedback stability?You can not understand contents I posted at all. Modern control theory is surely useful for judging stability of MIMO System. Your complex filter is formulated by using state space variable equations. So modern control theory is straight for

## ft of a transistor - non existent in the documentation.

HI pancho, thanks for the links but let me ask you if you're posting those links randomly?What do you want to know ? Can you tell me where is those links are some useful information about how to get the fmax of a MOSFET?What do you want to know ? Evaluation of fmax is very easy. Sim

Regarding the gm/Id paper by Tiwari page 21, the needed gm was calculated to be 12.6mA/V then on page 22 the gm/Id is calculated to be 6.3 V^-1 when the max drain current available i

## Is it possible to judge the improvement in the phase noise based on the pss sim?

Hi, I am trying to do something new to an existing VCO architecture and I found an improvement in the phase noise. Though I am not able to mathematically (I am able it only intuitively) explain the improvement at this point in time, I would like to know if PSS results are accurate enough. the question might sound vague, (...)

## How to plot transit frequency in virtuoso

Hi! Can someone help me with "how to" of current gain versus frequency for small signal analysis? I have looked into the following tri

## How to measure IIP3 and SFDR of a complex filter in spectre?

Hey guys, I just designed a active-RC complex filter based on TT biquad and work for GPS or Compass Receiver. the filter has 4 ports include two in-phase and two quadrature inputs. the in-phase consists of two AC signals, they are Mag 1.0 Phase 0.0 and Mag 1.0 Phase 180. the Q-phase are Mag 1.0 Phase 180 and Mag 1.0 Phase (...)

Hey guys, I was wondering where a design variable "frequency" gets generated in transient analysis in Cadence ADE (spectre) when I do a transient simulation of a set of devices using only behavioral VerilogA models and a Ipulse/current pulse. All the items in the simulation are behavioral models, and there is no "frequency" (...)

## [Moved]: S parameters and adaption and stabilité ?

See the followings.

## Ring-oscillator Verilog A

A ring oscillator with an odd count of inverters will always oscillate, because of the 180° phase shift. If you want to add phase shift to your Verilog-A inverters, perhaps this example could help, s. pp. 199 ff.

## Queries on deriving the equation of IIP3

I want to derive third order input intercept point (IIP3) for my designed low noise amplifier (LNA). What I observed in the many IEEE transaction LNA paper, they used Volterra Series Analysis for deriving the IIP3 equation for their LNA. Which is the best text book for deriving IIP3 for our LNA and where (...)

## PSD of The Phase of the Oscillator

Hi, In Phillips' paper: am quite baffled by his comment "impulse response of the phase deviation phi(t) can be approximated with a unit step s(t)". Why and how to explain that? Further, how to derive equation (6) from

## VHDL: operations on bit vectors

Hmm - the way you talk it sounds like you expect all these processes to act sequentially, like a C program. It wont. Have you got a sketch of circuit from before you write any code?

## Modeling Jitter in PLL-based Frequency Synthesizers

Does anybody download "Modeling Jitter in PLL-based Frequency Synthesizers" from and test it in cadence? How to simulate it? can you send me the project in cadence? thanks!

Hi, What is Linting and what is the use of linting ?. Why do we need linting checks? Suppose if we didn't do linting checks in RTL, what will happen? Please guide me.... Thanks

## Cadence Virtuoso AC Sweep: How to use frequency in calculator

Like if I'm doing a transient sim and my freq variable is "Freq" I'd just refer to the freq as VAR("Freq").Use xval() function. See the followings.

## famous Electronic Enginering community or forum

You are asking about other forums while already in a forum... Forum-ception!! Try this : the Designer's guide Community Forum

## Problem with starting Cadence IC6 SuSe 11.2

ic6 doesn't start I have installed cadence ic6 suse 11.2 when I type icfb& or virtuoso , cadence doesn't start and gives the following error Qt Warning: X Error: BadMatch (invalid parameter attributes) 8 Extension: 150 (RENDER) Minor opcode: 4 (RenderCreatePicture)

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