What is the current mirror?
The current mirror is a type of electrical circuit design where the current flow in one part of the circuit is used to control the current flow in other parts, so the output of two or more areas is reflected in the value. Current mirror circuits are usually designed with transistors of bipolar connecting couplings (BJT), such as NPN transistor, where the semiconductor base is positively doped (p-sub-footed) base base between two negatively doped (n-deceated) layers of silicon. These transistors are specially designed to amplify or switch the current flow. In some current design design specifications, the NPN transistor may act as an inverting current amplifier that reverse the current direction, or may control the changing pulse current of amplification to create the output mirror properties.
The use of a transistor current mirror becomes present within the transmission mirror. Can be used to produce output current at a lower level than input or, in the caseEch, when Wilson's mirror is used, creates an increased level of resistance to output by creating positive feedback in the circuit. In its basic form, the current mirror circuit works as a form of the current regulator, which is able to balance the output current values regardless of the level of input or resistance within the specified range of the operation for the circuit.
One of the reasons why bipolar connecting transistors are used for the construction of the current mirror is the fact that the basic emitter or part of the PN transistor works reliably as a diode. LEDs regulate both the amount of current that passes and the decrease in the forward voltage for this current. In most circuits, the diode current thus closely corresponds to the output current for transistors in current mirrors that reduce the resistance that the diode experiences CAN to be used as an accurate calculation to determine the increase in voltage via the EMI intersectionTORA PN transistors. This means that the collector current for input values on transistors also has the quality of a direct mirror for diode currents in the same circuit.
For the output current, however, it is in the current mirror, the temperature of all NPN transistors must also remain at a constant level. This is checked in the design of the circuit by physical gluing all current mirror transistors together or placed in close proximity to the integrated chip (IC) Circuit (IC) to share normal temperature. Despite this design limitation, the current mirror amplifier or sunk configuration common to many circuits as a form of a controller that could also be carried out by resistors in the circuit. This is because it is easier to produce transistors to the silicon surface of integrated circuits than it is to stick to them components of resistance.