Skip to main content

Integrated circuits

Integrated Circuits play a very important part in electronics. Most are specially made for a specific task and contain up to thousands of transistors, diodes and resistors. Special purposes IC's such as audio-amplifiers, FM radios, logic blocks, regulators and even a whole micro computers in the form of a micro controller can be fitted inside a tiny package.  Some of the simple Integrated Circuits
 
 
 
 Depending on the way they are manufactured, integrated circuits can be divided into two groups: hybrid and monolithic. Hybrid circuits have been around longer. If a transistor is opened, the crystal inside is very small. This means a transistor doesn't take up very much space and many of them can be fitted into a single Integrated Circuit The pin-out for some of the common packages is shown


Most integrated Circuits are in a DIL package - Dual In Line, meaning there are two rows of pins. (DIL16 and DIL8 are shown in 7.2b and 7.2c). The device is viewed from the top and the pins are numbered in an anti-clockwise direction.
High power integrated circuits can generate a lot of heat and they have a metal tag that can be connected to a heatsink to dissipate the heat. Examples of these IC's are shown in 7.2d and 7.2e, and 7.2f.
Symbols used to represent integrated circuits are shown in 7.2g and 7.2i. Symbol 7.2g is commonly used to represent amplifiers.
Figure this photo shows an operational amplifier. Signs + and - represent inverting and non-inverting inputs. The signal to be amplified is applied between one of the inputs and ground (ground and supply aren't represented, but are necessary for the circuit to operate).
Integrated circuits can be divided into two further groups: analog (linear) and digital. The output voltage of a linear circuits is continuous, and follows changes in the input. Typical representative of a linear IC is an integrated audio amplifier. When a signal from a microphone is connected to the input the output will vary in the same way as the voltage from the microphone. If watched on an oscilloscope, the signal on the output will be the same shape as the mic's signal, only the voltage will be higher depending on the amplification of the integrated circuit.
It is a different situation with digital IC's. Their output voltage is not continuous. It is either LOW or HIGH and it changes from one state to the other very quickly.

Comments

Post a Comment

Popular posts from this blog

How Does an Integrated Circuit Work

Integrated circuits are in almost every appliance known to man at this point in history from wristwatches to televisions and from coffee makers to, the most obvious, computers. An integrated circuit is a collection of diodes, transistors and microprocessors in miniature scale all operating on a single piece of semiconductor, typically silicon. Each performs a specific function that, when combined with the other components, can perform multiple tasks and calculations. First are the diodes; diodes by definition are electronic or electrical devices that regulate the flow or current of electricity within the circuit. Diodes control how much, when and how often electrons or electricity is allowed to flow into other parts of the system.We have all heard of transistor radios from the early 20th century and the transistors in integrated circuits, or ICs, are them same, at least by definition. Transistors can store voltage to stabilize the circuit or for amplifying a signal.
1 comment
Read more

Merits or Advantages of Integrated Circuits

The integrated circuits offer a number of advantages over those made by interconnecting discrete components. These are summarized as follows     Extremely small size—thousands times smaller than discrete circuit. It is because of fabrication of various circuit elements in a single chip of semi-conductor material Very small weight owing to miniaturized circuit Very low cost because of simultaneous production of hundreds of similar circuits on a small semiconductor wafer. Owing to mass production an IC costs as much as an individual transistor     More reliable because of elimination of soldered joints and need for fewer inter-connections Low power consumption because of their smaller size Easy replacement as it is more economical to replace them than to repair them Increased operating speeds because of absence of parasitic capacitance effect Close matching of components and temperature coefficients because of bulk produc¬tion in batches Improved functiona
1 comment
Read more