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What is constant current mirror circuit?
From Wikipedia, the free encyclopedia. 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.
Why is Wilson’s current A mirror?
A Wilson current mirror or Wilson current source, named after George Wilson, is an improved mirror circuit configuration designed to provide a more constant current source or sink. It provides a much more accurate input to output current gain. The structure is shown in figure 11.9.
What is the minimum voltage level Wilson current mirror circuit?
Minimum Operating Voltages ), this represents a saturation voltage for Q3 of 0.1 to 0.2 volts. By contrast, the standard two-transistor mirror operates down to the saturation voltage of its output transistor.
How does a Mosfet current mirror work?
MOSFET device function like this, the drain current reflects the function of the gate to source and drain to gate voltage. Due to this, the input current in the MOSFET M1, is mirrored to the drain current. In the image, the input current is provided by the bias resistor.
How are current mirrors used in Analog Devices?
Analog Devices current mirrors are precision, high dynamic range, wide variable supply parts used for optical power monitoring, voltage biasing with current monitoring, and voltage-to-current conversion. Our current mirrors can monitor current down to as little as 3 nA and as much as 3 mA, with a linearity of 1% or better.
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.
How is the current mirror of a sink replicated?
current mirror replicates the input current of a current sink or current source as an output current. The output current may be identical to the input current or can be a scaled version of it.