Electronic systems and circuits Electronic components Analog circuits Information and analog signals Noise Analog integrated circuit Disadvantages of analog systems Electronics at work Electronics hystory Electronics types Electronics in the house Electronics devices

Analog integrated circuit

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Active or passive analog electronic circuits can be fabricated directly onto semiconductor substrates, such as silicon. Such circuits are called analog integrated circuits. They may occur as sub-systems of other digital systems (e.g., an analog comparator in a microcontroller.) Analog integrated circuit design is a highly specialized area.
An analog chip uses its active devices primarily in their active regions. This is the fundamental difference between digital chips and analog chips.

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Digital chips use their devices in saturation or cutoff regions. Analog chips could also have passive elements (Inductor/Capacitors/Resistors) built into them. Digital chips typically don't have passive elements on the chip.
The field has had many great people of its own, like Bob Widlar, Bob Pease, Hans Camenzind, Geroge Erdi, Barry Gilbert etc.
Death of analog chips has been proclaimed regularly, however the field continues to grow and prosper. The most vivid examples of analog chips are the 741 op-amp, the 555 timer, etc. The 555 was invented by Hans Camenzind in 1970s, and is the most popular selling analog chip.
The story of the design of the 555 can be found at arraydesign.com. A free book on Analog Chip Design is also available from Hans Camenzind on his web site.
The important basic building blocks of analog chip design are:

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Bandgap References.
It is not difficult to bias "digital" TTL and CMOS chips [Inverters and Buffers] into linear operation. Very useful circuits can be formed that way. The 4007 is legendary for such uses.

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Links Electronics Electronic systems and circuits Electronic components Analog circuits Information and analog signals Noise Analog integrated circuit Disadvantages of analog systems Electronics at work Electronics hystory Electronics types Electronics in the house Electronics devices