![]() Early), a basic theoretical analysis that does not include it will predict better performance than will be achieved in practice. As a result of the Early effect (which is named after James M. Although this is very real and does influence real circuits to a greater or lesser degree, it needlessly complicates the descriptions and explanations. Throughout this article, I have neglected the Early effect, where the gain of a bipolar transistor is affected by the emitter-collector voltage. This short article looks at the various types, from the theoretical or 'ideal' device, through various practical examples. In essence, the functionality (and purpose) are identical - force the current through another device to be constant, as long as the voltage is within the boundaries of the power supply (less some voltage drop across the source / sink).Ĭurrent mirrors have the ability to greatly increase open loop gain and linearity, giving better open loop performance, which translates to better closed loop performance. For the purposes of this article, sources and sinks shall be treated as being the same thing - which they are, depending upon how one views the circuit. Integral to most amplification systems (including audio), the current source and current sink are indispensable. ![]() 8.0 - Differential Pair (Long Tailed Pair).
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