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How is the output current determined in a mirror circuit?
If we see the circuit carefully, the base-emitter of two transistors, T1 and T2 are in parallel with each other. Therefore, the two transistors have the same current. So, the best way to determine the output current is to add up the node current, where the I REF is flowing.
How does a current mirror circuit work with MOSFET?
Current Mirror Circuit using MOSFET The first MOSFET like M1 is in the saturation region because of the VDS ≤ VGS whereas the second MOSFET like M2 is in the saturation region if the output voltage is higher as compared to the saturation voltage. So the input current of the first MOSFET can control the o/p current of the second MOSFET.
How does a bipolar mirror convert voltage to current?
The simplest bipolar current mirror (shown in Figure 1) implements this idea. It consists of two cascaded transistor stages acting accordingly as a reversed and direct voltage-to-current converters. The emitter of transistor Q1 is connected to ground. Its collector-base voltage is zero as shown.
How is a Wilson current mirror circuit simulated?
Here the Wilson current mirror is simulated using Proteus. The three active components (BJT) are used to make the circuitry. The BJTs are all 2N2222, with same specifications. The pot is selected to change the current across Q2 collector which will further reflect on the Q3 collector.
What is the current range of a mirror?
The current dynamic range is 120 dB or 6 decades of current range, while the overcurrent protection feature in our devices forces the input pin to ground to avoid part damage. Over temperature (–40°C to +85°C) and process, the dynamic range only suffers 10 dB at the lower end of the range.
Can a mirror circuit be implemented using two MOSFET transistors?
Current mirror circuit can be easily implemented using two MOSFET transistors. The working of the MOSFET current mirror circuit is similar as described in the previous transistor section. Consider the above current mirror circuit using MOSFET, the MOSFET transistor M1 is in the saturation region as the V DS ≤ V GS.
How is the current of one device mirrored in another?
In this, the current is flowing through one device can be copied into another device but in inverting form. If the current of the first device is changed, the mirrored current output of the other device will also change. So by controlling the current in one device, the current in another device can also be controlled.