what is current mirror? & what are it's applications?

Question

What is current mirror, how it works,  it's characteristics , advantages and applications?

Atul Patiram Pohankar · Answer

it is an circuit which copy current through one active device by controling the current in another active device of circuit keep out put current constant
it use to provide bias current and active load

Saumya Khare · Answer

A current mirror is a circuit designed to copy current through an active device by controlling the current in another active device keeping output constant irrespective of loading.
Current mirrors take a positive current (source) and generate a negative current (sink).
Current mirrors have low input impedance, so the 'reference' current can be from a poor current source (output impedance 1k ohms) and give rise to a mirrored current that is a better current source (output impedance 100k ohms). They isolate the input from variations in the output, so we can wire together a dozen current mirror outputs to make a summing junction, without causing any signal flowing back into the input nodes.

Hrithik Baishakhiya · Answer

Current mirrors as the name suggests copies the current so as to supply nearly constant current to a load over a wide range of load resistances. The copied current is sometimes said to be Time-varying.  Conceptually, an ideal current mirror is simply an ideal inverting current amplifier that reverses the current direction as well. Or it can be visualized to contain a current-controlled current source (CCCS). It is majorly used to avail bias currents to active loads in circuits which eventually finds applications in differential amplifier and operational amplifier and many basic electronics can be used to achieve a current mirror circuit like transistors, MOSFETs etc.

Siva Raman R · Answer

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 outputcurrent constant regardless of loading. ... The current mirror is used to provide bias currents and active loads to circuits.