Analog circuits

Most analog electronic appliances, such as radio receivers, are constructed from combinations of a few types of basic circuits. Analog circuits use a continuous range of voltage as opposed to discrete levels as in digital circuits. The number of different analog circuits so far devised is huge., especially because a 'circuit' can be defined as anything from a single component, to systems containing thousands of components.

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Analogue circuits are sometimes called linear circuits although many non linear effects are used in analogue circuits such as mixers, modulators etc. Good examples of analog circuits are valve or transistor amplifiers, operational amplifiers and oscillators.
Some analog circuitry these days may use digital or even microprocessor techniques to improve upon the basic performance of the circuit. This type of circuits is usually called 'mixed signal'.
Sometimes it may be difficult to differentiate between analog and digital circuits as they have elements of both linear and non linear operation. An example is the comparator that takes in a continuous range of voltage but puts out only one of two levels as in a digital circuit. Similarly, a transistor amplifier overdriven can take on the characteristics of a controlled switch having substantially only two levels of output.

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Analog circuit (or analogue circuit) refers to electronics systems with analog signals with any continuously variable signal. It differs from digital electronics in that small fluctuations in the signal are meaningful in that they are continuously variable rather than digitally quantized
Analog electronics is sometimes confused with other sub-divisions of the general field of Electronics which include Power electronics and Digital electronics

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The word "analog" implies an analogy between cause and effect, voltage in and voltage out, current in and current out, sound in and sound out. For example, in an analog sound recording, the variation in pressure of a sound striking a microphone creates a corresponding variation in the current passing through it or voltage across it. An increase in the volume or amplitude of the sound causes the fluctuation of the current or voltage to increase proportionally while keeping the same waveform or shape and electrical analog. Clocks with hands are often called analog displays; those that display digits are usually called digital displays. However, many analog clocks are actually digital since the hands do not move in a smooth continuous motion, but in small steps every second or sub division of a second.
In the field of Power Electronics analogs can be the Energy Storing variables such as the current in an Inductor or the Voltage across the terminals of a Capacitor.

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