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Voltage and Frequency are typical absolute sources or references to drive other circuits. You have voltage references and frequency references. Current is defined by placing a known stable voltage across a known stable resistor. Frequency and Time measurements are often driven by a master oscillator such as a XTAL. Precision is defined by the accuracy of your reference sources, which determines how accurate your DVM/LCR/Frequency counter/O-scope are.

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I am now investigating on replacing the ideal current source with the circuit similar to the one attached below. Why would the mosfet M16 be connected to drain of M12 ? I am confused about how the additional circuitry works. …
asked Mar 21 '16 by kevin