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Module P4.1 DC circuits and currents
Module P4.1 DC circuits and currents

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... without the gate current. It is said to be latched “on”. Note that the VGT, IGT and IL specifications given in the data are at 25 degrees C. These parameters will increase at lower temperatures, so the drive circuit must provide adequate voltage and current amplitude and duration for the lowest expe ...
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... limit ΔV1min, in order to give thyristor switch, which conducts at that moment, enough time to turn off. An example where condition A initiates transferring on phase a is depicted in Figure 4a. Fault occurs at t=0.028 s, transfer signal is generated(voltage sag is detected) at t=0.032 s and transfer ...
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Current mirror

A current mirror is a circuit designed to copy a current through one active device by controlling the current in another active device of a circuit, keeping the output current constant regardless of loading. The current being 'copied' can be, and sometimes is, a varying signal current. Conceptually, an ideal current mirror is simply an ideal inverting current amplifier that reverses the current direction as well or it is a current-controlled current source (CCCS). The current mirror is used to provide bias currents and active loads to circuits. It can also be used to model a more realistic current source (since ideal current sources don't exist).The circuit topology covered here is one that appears in many monolithic ICs. It is a Widlar mirror without an emitter degeneration resistor in the follower (output) transistor. This topology can only be done in an IC as the matching has to be extremely close and cannot be achieved with discretes.Another topology is the Wilson mirror. The Wilson mirror solves the Early effect voltage problem in his design.
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