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An ''analog chip'' uses its active devices primarily in their active regions. This is the fundamental difference between Digital Chip s and Analog chips. Digital chips use their devices in saturation or cutoff regions. Analog chips could also have passive elements ( Inductor / Capacitor s/ Resistor s) 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: #Current Sources #Current Mirrors #The differential pair #Bandgap References. It is not difficult to bias "digital" TTL and CMOS chips and Buffers into linear operation. Very useful circuits can be formed that way. The 4007 is legendary for such uses. REFERENCES
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