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by Dinesh Thakur Category: DIGITAL CONCEPTS

The DSSS (Direct Sequence Spread Spectrum) is a technique spread spectrum, but unlike the FHSS, no frequency hopping is place: DSSS causes very rapid state transitions (chipping) which tend to spread the spectrum of the signal: in fact, we have seen that with the modulations FSK, PSK and QAM width of the spectrum was twice the rate of the source. Causing "artificially" very high throughput, spectrum is spread.

 
by Dinesh Thakur Category: DIGITAL CONCEPTS

The 80386 chip has one big advantage over the 80286: it includes fully functional, built-in circuits for multi-tasking, or running two or more programs at the same time. Although software like Windows, DesQview, or Unix will let you "multi-task" using lowlier chips, the 80386 does it more reliably and with less hassle. Windows, for example, running in "386 Enhanced Mode," lets you use multiple standard DOS programs at the same time, whereas you're limited to only one DOS program at a time with an 80286. Another improvement in the 80386 is its ability to access even larger amounts of memory than the 80286, and to do so with less trouble. Again, DOS is oblivious to the extra memory, but you can buy software that bypasses this limitation through a DOS extender.



 
by Dinesh Thakur Category: DIGITAL CONCEPTS

A breadboard is a thin board, sometimes fiberglass and sometimes plastic, with lots of little holes arranged in a grid. Electronics engineers use breadboards to create prototypes of circuit boards by wiring chips, resistors, and other electronic parts onto the board by hand, with the connecting wires running underneath. The term sometimes refers to the finished prototype itself, but more often it's applied to the hole-filled board to which the electronic components are attached.

 
by Dinesh Thakur Category: DIGITAL CONCEPTS

(Metal Oxide Semiconductor Field- Effect Transistor) The fundamental building block of modern VLSI chips such as microprocessors and memory chips. A microscopically small FIELD-EFFECT TRANSISTOR formed on the surface of a prepared silicon wafer by exposing it to a succession of chemical treatments through a sequence of masks.



 
by Dinesh Thakur Category: DIGITAL CONCEPTS

An electronic circuit that increases the amplitude of its input signal and outputs the result. The most familiar type is the audio amplifier, as found in domestic hi fi or telephones, but amplifiers are to be found in every sort of device, including silicon chips:

 
by Dinesh Thakur Category: DIGITAL CONCEPTS

The 80286 was the microprocessor used in IBM'SPC/AT. The 80286 calculates faster than the 8088. It also corrected one of the biggest problems with the 8088-its inability to access more than a small amount(1 megabyte) of memory. But-and this is a big catch-DOS couldn't takeadvantage of the extra memory. Why, you ask? Well, because DOS had torun on 8088-based computers too, so it couldn't be changed to accommodatethe new chip. Windows, however, does utilize the special talents ofthe 80286 in "standard mode." In fact, you can't run Windows 3.1 unlessyour PC has an 80286 or an even newer microprocessor. However, there isa way to create software that uses the extra memory but still manages torun in DOS.



 
by Dinesh Thakur Category: DIGITAL CONCEPTS

1. A physical object or quantity, for example a moving clock hand or an electrical voltage, that is used to measure or represent some other quantity, and is hence analogous to it.

2 A family of electronic devices that represent other physical quantities by continuously varying voltages rather than the two discrete voltage levels used in DIGITAL devices.

 
by Dinesh Thakur Category: DIGITAL CONCEPTS

An electrical current that periodically reverses its direction. The electrical mains supply is an alternating current that varies in a sinusoidal fashion, reversing itself 50 times per second in the UK and Europe, and 60 times per second in the USA.

 
by Dinesh Thakur Category: DIGITAL CONCEPTS

The FHSS (Frequency Hopping Spread Spectrum) was invented and patented in 1942 by the actress Hedy Lamarr and pianist George Antheil, which were quite versatile! The principle of FHSS is quite simple: a wide frequency band is divided into multiple channels and communications are jumping (hopping) sequentially from one channel to another in a sequence and a rate agreed to advance between the transmitter and the receiver.

 
by Dinesh Thakur Category: DIGITAL CONCEPTS

DIP is an acronym that stands for dual inline package and refers to the physical layout of most computer chips. The standard chip looks like a bug, or a little rectangular box with legs. Those two rows of metal legs are the "pins" that connect the chip to the computer's circuits. The whole chip is referred to as a "package," and it's a dual inline package because the pins are lined up in two rows. 



 

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About Dinesh Thakur

Dinesh ThakurDinesh Thakur holds an B.SC (Computer Science), MCSE, MCDBA, CCNA, CCNP, A+, SCJP certifications. Dinesh authors the hugely popular Computer Notes blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps. For any type of query or something that you think is missing, please feel free to contact us.



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