Electronic circuit

Small parts work together in a group.

These parts use wires to move power. This power lets the parts do jobs. They can move data from one place to another. Some parts can even do math.

Most parts sit on a flat board. They are joined by tiny metal paths. These boards are in phones and computers. It is like a tiny team. Can you find a tool with these parts?

An electronic circuit is a group of parts. These parts connect with wires. The wires let electric current flow through them.

Most circuits use parts like resistors or transistors. A transistor is an active part. It helps the circuit do many jobs. Circuits can move data or do math. They can even make a signal bigger.

Today, many parts sit on a flat board. This is called a printed circuit board, or PCB. Parts are often joined to the board with solder. Some circuits are very tiny. They are made on a single chip. We call these integrated circuits.

There are different kinds of circuits. Analog circuits use signals that change smoothly. Digital circuits use signals that take on specific values. They often use binary. This means they use two values to show data. One value is a '1' and the other is a '0'. Digital circuits are in phones and computers. Some circuits use both types. We call these mixed-signal circuits.

An electronic circuit is a special way to use electricity. It is made of many small parts. These parts include resistors, transistors, capacitors, inductors, and diodes.

These parts connect using wires or paths called traces. Electricity flows through these paths to do work. A circuit is called electronic if it has an active component. An active component can control the flow of electricity. These circuits allow us to do many things. They can make signals bigger or move data around. They can even perform math problems.

There are different ways these circuits work. An analog circuit uses signals that change smoothly over time. These signals can change their voltage or current constantly.

Digital circuits work in a different way. They use signals that take on specific, separate values. Most digital circuits use a system called binary. This uses two values to show information. One voltage represents a '1'. A different voltage represents a '0'. This allows computers to process data. Some circuits are mixed-signal circuits. These use both analog and digital parts together.

People use different methods to build these circuits. In the past, parts were joined by individual wires. Today, most circuits use a printed circuit board, or PCB. This is a flat base with paths on it. Engineers use a process called photolithography to make these paths. Then, they solder the parts onto the board. Some circuits are even smaller than a board. These are called integrated circuits, or ICs. In an IC, all the parts and paths are on one tiny piece. This piece is usually made of a material called a semiconductor.

Many different materials and parts make these systems possible. Silicon is a common semiconductor used for integrated circuits. Some people also use gallium arsenide for these chips. One very common part is the MOSFET. This is a type of transistor that helps circuits work.

Digital circuits can have billions of tiny parts on one chip. These chips are used in many tools we use every day. You can find them in calculators and mobile phones. They are also inside computers. Some special chips are called FPGAs. These can be changed even after they are made.

Electronic circuits are part of almost everything we use. You can see them in the phone in your hand. You can find them in the computer on a desk.

Even a simple radio uses these circuits to work. A radio receiver uses analog parts to grow a signal. Then, it uses digital parts to process that signal. This is why we can listen to music or talk on phones. The tiny parts work together to make modern life possible. It is amazing how much happens inside such small spaces.

An electronic circuit is a specialized system used to control electricity. It consists of individual electronic components connected by conductive wires or traces. These components allow electric current to flow through the system. Common parts include resistors, transistors, capacitors, inductors, and diodes.

While electrical circuits move power, an electronic circuit must contain at least one active component. An active component is a part that can control the flow of electricity. This control allows circuits to perform complex tasks. They can amplify signals, perform mathematical computations, or move data between locations.

To understand how these systems are built, we must look at their physical structure. Early circuits used discrete components joined by individual pieces of wire. Today, most circuits use a printed circuit board, known as a PCB. A PCB is a laminated substrate with conductive traces etched onto it. Engineers use photolithographic techniques to create these precise interconnections. Once the paths are set, components are attached using solder.

Even smaller systems exist called integrated circuits, or ICs. In an IC, all components and connections are formed on a single substrate. This substrate is usually a semiconductor, such as doped silicon or gallium arsenide. The most widely used semiconductor device in these circuits is the MOSFET, or metal–oxide–semiconductor field-effect transistor.

Electronic circuits are generally categorized into three types: analog, digital, and mixed-signal. Analog circuits handle signals that vary continuously with time. In these systems, the current or voltage changes smoothly to represent information.

Engineers use schematic diagrams to represent these circuits. In a schematic, wires are shown as lines and components use unique symbols. To analyze these circuits, engineers apply Kirchhoff's circuit laws. These laws state that all currents at a node must equal zero. Additionally, the total voltage around any closed loop must also be zero. At very high frequencies above 1 GHz, wires are treated as transmission lines. This is known as the distributed-element model.

Digital circuits operate using a fundamentally different logic. Instead of continuous changes, digital signals take on discrete values. These values represent specific logical or numeric information. Most digital systems use binary encoding to process this data. In binary, one voltage level represents a '1' and a lower voltage represents a '0'.

Digital circuits rely heavily on transistors to create logic gates. These gates perform Boolean functions like AND, OR, NAND, NOR, and XOR. By interconnecting transistors to provide positive feedback, engineers create latches and flip-flops. These components allow a circuit to remain in a specific state until an external input changes it. This ability provides both logic and memory for the system.

Digital memory comes in several specific forms. One type is static random-access memory, or SRAM, which is based on flip-flops. Another common type is dynamic random-access memory, or DRAM, which stores charge in a capacitor. Because each logic gate in a digital circuit regenerates the binary signal, designers do not have to worry about distortion or gain control. This makes the design process much different from analog design. Because of this efficiency, it is possible to build extremely complex digital circuits. Modern chips can integrate billions of logic elements on a single silicon chip at a low cost.

These advanced digital circuits are found in almost all modern technology. You can find them in calculators, mobile phone handsets, and computers. Engineers use different types of chips for different purposes. Microprocessors are general-purpose computing chips used for many tasks. Some engineers design application-specific integrated circuits, or ASICs, for custom tasks. There are also field-programmable gate arrays, known as FPGAs. These are unique because their logic configuration can be modified even after they are manufactured.

However, as circuits get denser, engineers must manage issues like power dissipation and leakage currents.

Finally, many systems require mixed-signal or hybrid circuits. These circuits contain both analog and digital elements to bridge the gap between the two worlds. Common examples include comparators, timers, and phase-locked loops. They also include analog-to-digital and digital-to-analog converters. Mixed-signal circuits are essential for modern radio and communications. For instance, a radio receiver uses analog circuitry to amplify and convert signals. Once the signal is in a suitable state, it is converted into digital values. This allows the device to perform further signal processing in the digital domain.