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There are three main specifications that characterize a current mirror. The first is the transfer ratio (in the case of a current amplifier) or the output current magnitude (in the case of a constant current source CCS). The second is its AC output resistance, which determines how much the output current varies with the voltage applied to the ...
The result is that new designs tend to use some variant of a wide swing cascode current mirror configuration. [10] [14] [15] In the case of extremely low power supply voltages of one volt or less, the use of current mirrors may be abandoned entirely. [16]
The current mirror copies the left collector current and passes it through the right transistor that produces the right collector current. At this right output of the differential amplifier, the two signal currents (pos. and neg. current changes) are subtracted. In this case (differential input signal), they are equal and opposite.
The Blackmer cell is a direct descendant of a two-transistor log-antilog circuit, itself a derivative of the simple current mirror.Normally, the bases of two transistors of a mirror are tied together to ensure the collector current I 2 of the output transistor T2 exactly mirrors the collector current I 1 of the input transistor T1.
The use of a cascode (sometimes verbified to cascoding) is a common technique for improving analog circuit performance, applicable to both vacuum tubes and transistors.The name "cascode" was coined in an article written by Frederick Vinton Hunt and Roger Wayne Hickman in 1939, in a discussion on the application of voltage stabilizers. [3]
Transistors Q11 and Q10 form a Widlar current mirror, with quiescent current in Q10 i 10 such that ln(i 11 / i 10) = i 10 × 5 kΩ / 28 mV, where 5 kΩ represents the emitter resistor of Q10, and 28 mV is V T, the thermal voltage at room temperature. In this case i 10 ≈ 20 μA.
If the bias current is fixed for some performance reason, any increase in load resistance automatically leads to a lower voltage for V out. which in turn lowers the voltage drop V CB between collector and base, limiting the signal swing at the amplifier output (if the output swing is larger than V CB, the transistor is driven out of active mode ...
Current mode logic (CML), or source-coupled logic (SCL), is a digital design style used both for logic gates and for board-level digital signaling of digital data. The basic principle of CML is that current from a constant current generator is steered between two alternate paths depending on whether a logic zero or logic one is being represented.
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