Micro-Cap 10 released

spectrum software has released a new version of its popular EDA tool "Micro-Cap".The Micro-Cap 10 has many new features and improvements.Micro-Cap 10 incorporates many incremental refinements reflecting requests received from users. These and other small, incremental refinements are a big part of what makes the product so easy to use. The technical advancements in MC10 are principally four in number:

Threading
Using threading techniques, multiple CPUs are employed to reduce simulation time.

PSS
Periodic Steady State uses techniques pioneered by Aprille and Trick to calculate the periodic steady state, removing any short term transients from the time-domain waveforms, greatly simplifying many types of circuit analysis problems.

Distortion:
Two completely new analyses make creation of harmonic and intermodulation distortion plots easy.

Optimization
Optimization has been improved by the addition of three additional methods. The complete list of methods now includes, Powell, Hooke, Levenberg-Marquardt, and Differential Evolution.


visit to download http://www.spectrum-soft.com/index.shtm

Circuit Magic:An electrical circuit simulation program

Circuit Magic is an electrical circuits simulation program specifically designed for students teaching basics electronics, electrical laws & circuit theory. Unlike many electronic circuit analyzers, Circuit Magic can analyze circuits like a man. Circuits are simulated step by step, using natural solving strategy.

                          

 

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Key Features

Easy to use electrical schematics editor, helping to make an easy task of circuit design

Circuit simulation capability to perform Alternating/Direct currents analysis using Kirchhoff's current and voltage laws, node voltage and mesh current method

Extended text editor

A graphics toolkit to allow text, lines, arc and rectangles to be added as circuit and phasor diagram annotations

Affordable Educational Pricing.

Free user support

Electronics Assistant:A progrgam for basic electronic calculations

Electronics Assistant is a small program designed to perform basic electronics-related calculations. It includes a resistor colour code calculator, resistor, capacitor and potential divider calculators and more. It is a freeware which means it is free to download,modify and distribute.

click here to download the software

 

Why is a cell phone called a cell phone?

One of the most interesting things about a cell phone is that it is really a radio. Before cell phones, people who needed mobile communications ability installed radio telephones in their cars. In the radio telephone system, there was one central antenna tower per city, and perhaps 25 channels available on that tower. The cellular phone system divides the area of a city into small cells of hexagonal shape(see fig).Each hexagonal cell is installed with a Base Station Tower.

Technorati Tags: cellphone,base station,radio transmitter

This allows extensive frequency reuse across a city, so that millions of people can use cell phones simultaneously.

Here's how it works: The carrier chops up an area, such as a city, into cells. Each cell is typically sized at about 10 square miles (perhaps 3 miles x 3 miles). Cells are normally thought of as hexagons on a big hexagonal grid. Each cell has a base station that consists of a tower and a small building containing the radio equipment. Cell phones have low-power transmitters in them and the base station is also transmitting at low power. Low-power transmitters have two advantages:

• The power consumption of the cell phone, which is normally battery-operated, is relatively low. Low power means small batteries, and this is what has made handheld cellular phones possible.                                                                                      
• The transmissions of a base station and the phones within its cell do not make it very far outside that cell. Therefore, cells can use the same 56 frequencies. The same frequencies can be reused extensively across the city.

The cellular approach requires a large number of base stations in a city of any size. A typical large city can have hundreds of towers. But because so many people are using cell phones, costs remain fairly low per user. Each carrier in each city also runs one central office called the Mobile Telephone Switching Office (MTSO). This office handles all of the phone connections to the normal land-based phone system, and controls all of the base stations in the region.
­ As you move toward the edge of your cell, your cell's base station will note that your signal strength is diminishing. Meanwhile, the base station in the cell you are moving toward (which is listening and measuring signal strength on all frequencies, not just its own one-seventh) will be able to see your phone's signal stre­ngth increasing. The two base stations coordinate themselves through the MTSO, and at some point, your phone gets a signal on a control channel telling it to change frequencies. This hand off switches your phone to the new cell.

EKLAVYA:Technology channel

Eklavya is the technology channel  dedicated to technical education and shall run programmes generated at different IITs. This channel  marks the beginning of a new era in the dissemination of technical education in the country.

The channel was inaugurated by Prof. Murli Manohar Joshi, Honourable Minister, HRD, S&T and Ocean Development on 26th January, 2003. This is a joint initiative of IIT’s and IGNOU and is catalyzed by Ministry of Human Resource Development.

The vision is to share the knowledge and expertise with all and to bring about a true socialism in engineering education cutting across all boundaries. Yes, we want to come close to you, particularly the students pursuing the degrees in various disciplines in the area of technology and engineering.

EKLAVYA epitomizes the true spirit of learning and dedication, so irrespective of wherever you are, you will be able to share the resources available at IITs. And that too, without any Guru Dakshina because it is a free-to-air channel. Your motivation and enthusiasm are the only pre-requisites. It being a totally digital transmission, you will receive crystal clear ../images.

what does this channel broadcast?

The channel shall be bringing to you the actual IIT classrooms virtually at your door steps. The channel is designed to carry video courses in different disciplines generated at various IITs on weekdays and special interest programmes on Sundays. Currently, eight complete courses are being run in parallel, contributed by IIT Delhi, IIT Kharagpur and IIT Madras and are repeated in the same sequence without a break. Courses from other IITs shall also be made available in future. It started as a 16 hours-a-day affair. From 1st October 2003, it is now a 24 hours Channel..

minister for HRD,Prof. Murali Manohar Joshi inaugurating the launch of the Eklavya channel.

Technical details to receive the Eklavya channel

D o w n   L i n k

Through INSAT 3C Satellite on
C band (74 degrees East),
frequency 4165 MHz.,
Symbol rate 26.000 SPS, FEC ½,
Polarization Horizontal.
Ask your friendly cable operator
to provide this channel so that you could watch your favorite course / programme in the cozy environs of your home.
Your institute can also receive this signal directly with a little investment on a small dish antennae and a decoder (IRD).
All that is needed is
1) 12 feet / 8feet diameter perforated dish antennae
2) C-band LNBC
3) C-band feed horn
4) Low loss RF Cable Analog
5) Integrated receiver decoder (IRD) for Digital reception
6) Television set.

SIMetrix:A mixed signal circuit simulator

Technorati Tags: SIMetrix,CAD,circuit simulator,xspice,SPICE,schematic editors,AC analysis

SIMetrix is a mixed-signal circuit simulator designed for ease and speed of use. It is based on two publicly available programs namely SPICE developed by the CAD/IC group at the department of Electrical Engineering and Computer Sciences, University of California at Berkeley and XSPICE developed by the Computer Science and Information Technology Laboratory, Georgia Tech Research Institute, Georgia Institute of Technology. XSPICE itself was developed from SPICE3C1.

Although originally derived from these programs SIMetrix includes front and back-end features that dramatically enhance their overall capability. Further, many improvements to the underlying simulation algorithms and device models have been made to the original code to increase accuracy and convergence reliability.

click here to download SIMetrix

snapshot of schematic editing window

transient analysis of the circuit shown in the previous fig.

AC analysis of the circuit

Features

• Closely coupled direct matrix analog and event driven digital simulator.

• Fully integrated hierarchical schematic editor, simulator and graphical post-processor.

• Superior convergence for both DC and transient analyses. "Pseudo transient analysis" algorithm solves difficult operating points while enhanced transient analysis algorithm virtually eliminates transient analysis failures.

• Advanced swept analyses for AC, DC, Noise and transfer function. 6 different modes available.

• Real time noise analysis allowing noise simulation of oscillators and sampled data systems.

• Support for BSIM3, BSIM4, MOS9, VBIC and Mextram devices. Compatible with HSPICE model files.

• Cross probing of voltage, current and device power from schematic. Current and power available for sub-circuits.

• Monte Carlo analysis including comprehensive tolerance specification features..

• Full featured scripting language allowing customised waveform analysis and automated simulation

• Incremental graphing of results as simulation proceeds.

• Functional modelling with arbitrary non-linear source and arbitrary linear s-domain transfer function.

• Arbitrary logic block for definition of any digital device using descriptive language. Supports synchronous, asynchronous and combinational logic as well as ROMS and RAMS.

• Models for saturable magnetic components including support for air-gaps.

• User definable fixed and popup menus and key definitions.

click here to download SIMetrix