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Wideband low noise amplifiers exploiting thermal noise cancellation
Wideband low noise amplifiers exploiting thermal noise cancellation
Date: 11 November 2010, 16:02

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It was around the mid-nineties at the University of Twente, when Eric Klumperink had a wild idea: since popular analog basic circuits, like the differential pair, current mirror etc are all very simple, he wondered if we already know all possible simple circuits. Starting with two MOSFETs and resistors, he tried to figure out how many circuits he could generate. As a transistor usually acts as a voltage controlled current source, while resistors can also be modeled in that way, Eric decided to use voltage controlled current sources as building blocks and find two-port circuits with a non-zero transfer function. Using brains, graph theory, and a MAPLE computer program, he found them all: 145 circuit-graphs with two voltage controlled current sources. As each graph has several different transistor implementations, hundreds of transistor-resistor circuits are possible.
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