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# Speed Serial Design

1000 Threads found on edaboard.com: Speed Serial Design

I have been digging through various forums and internet articles searching for a current sensing relay circuit that will activate a low voltage relay when the circuit senses a 120v machine drawing 5 or more amps of power. I have hand drawn a schematic and is attached. My desire is to activate a low voltage circuit by simply "closing" the

## AC-DC power supply design

I'm trying to design a self contained DC bus power supply. Specifically it's for a 400v 2200w AC servo drive. Trying to get this all down on 1 PCB for simplicity. I've been using this drive for some time with just 240v mains rectified to 340vDC and some filter caps. The inrush current on charging the caps from flat is rather large, Which for a whil

## Frequency Generator XR-2206 PCB Design Missing Components

I am new on PCB design. I want to learn, as I have no idea about how should I do my own designs, I am copying some existing ones .. So, I choose a Simple One, a Frequency Generator Module (XR-2206): 157392 The PCB Layout at the Top looks like this: 157393 and at the botton looks like th

## SMPS for 5000W can be a Full Bridge

On page 9 of the book ?Power supply design, Volume 1 Control? by Dr Ridley, he states that a Full Bridge converter is good for power levels from 200w to over 5000w. Most places where I have worked would usually say above 1000W means a resonant converter is really needed. If anything, it is said that this is because the noise of a hard switched c

## BJT amplifier design

Hello everyone, as a part of a course in analog circuits, I need to design a BJT amplifer with the following parameters: Voltage gain = 51 Rin = 55 Rout = 50 Band width: DC suppliers allowed: +/- 5V The purpose is to as less stages as possible. I thought about using two stages : of CB and CE or 2 stages of CB.

## CMFB biasing current in fully differential Opamp with adaptive current source

Hello, I am trying to apply an adaptive biasing technique to source the differential pair of the fully differential amplifier, the adaptive biasing source a current of let say Ib under small signal condition. Under slewing or large signal behavoiral this current is increased proportionally to the input difference amplitude. My question, I alr

## Designing an amplifier with particular values

Hi everyone, As part of the course i took in analog circuit i required to design an amplifier with these values: Rin= 52kohm Rout = 53 ohm A=35 gain in db F-3dblow = 400hz F-3dbhigh = 400khz M1= 40db/dec M2 = -20 db/dec Dc supply voltage are : +5 v , -5v Transitors are ntype BJT My idea was using a simple CE amplifier with 2 resis

## PCB Designg Missing Components

I am new on PCB design

## Has anybody used Oceane for IC design

Anyone designed with Oceane?

## USB current negotiation

Hi all, I'm working on a design that draws power through USB but needs about 1.5A of current at 5V. Hence I'm exceeding the 500mA limit and need to "negotiate" a higher current from the source. I've read various pieces of USB documentation and I understand a small microcontroller would be the way to do this properly. I'm looking for a solution t

## CST excitaion signal

I added a new excitaion signal by importing ASCII file BUt the cst gives this below and suddenly aborts : The current settings will lead to an extremely long simulation time. You may improve the simulation speed by: 1. checking the frequency range and units settings 2. reducing the simulation duration 3. checking the mesh to avoid very s

I have a VCVS instance in my schematic design. I can't find VCVS in layout after generate from schematic because there is no VCVS PDK in Layout. How can solve this problem? Thanks. Attached is VCVS symbol in schematic.

## Non-symmetric S-parameter in HFSS

Hi, I am trying to design a structure where I need to add some non-symmetric s parameters. However, HFSS is automatically converting it into symmetric. What should I do in this case. In the structure, I have created circuit port and add snp file which is not symmetric. but HFSS is automatically converting this into symmetric. In this case wha

## Finding W and L of transistors from DC operating point.

Hi guys, I have a schematic of OTA amplifier: 157362 I want to know the W and L that were used to design this OTA. I don't have more information other than the ones provided in this picture. since all transistors are in saturation, I thought about using the saturation current equation to find (W/L) ratio. by assuming

## Testing Amps on rewound microwave transformer

I need a max of 40v and 8a to power my drop down variable power supply. I have old microwave transformers so I removed the secondary and rewound it with 14 gauge wire. I now get 48vac and when I use a bridge rectifier it brings it down to 40vdc. I tried to test amps by hooking up my tester (rated at 20amps) and only succeeded in burning up some jum

## Reducing RAM & ROM consumption in coding

How can I rewrite this code to use less RAM & ROM? ADC: 10bit. speed: 1MSPS. Data input range: 0-5V. CPU: DSPIC30F2010; 16bit. This code is working fine. But consuming 25% of total ROM & 40% RAM. I need suggestion to rewrite this code so that I can save some RAM & ROM. I need at-least 20 samples to get the best result. Signal is both AC & D

## Fast static CMOS comparator circuit

Static CMOS comparators are not really good when it comes to Vio (t=0, and drift). That's why so many are clocked (that, and low quiescent power). If you were clever and had the die area and a handy clock resource, you could make a ping-pong comparator that zeroed one side while the other was real-time ("static"). High gain is the enemy of h

## Verdi: Assertion debug mode question

Hey all, I am using Verdi for simulation of RTL. We have lot of assertions in design and I would like to know if an assertion is fired in a simulation or not. There is a assertion debug mode which should list out all the assertions, however, I am not seeing any information if it is passing, failing, checked, or not at all fired. Is there some ki

## Seeking advice for my job hunting

Hi All, I have been working in a company for 3 years an a half as an electronic design engineer. I have done schematics, layout, test prototypes...etc. When I started to work there was a good number of product range already developed, so what I have done mainly is adding features to existing products rather than design product from scratch. I a

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