Contents
What is mos 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 mirror is used to provide bias currents and active loads to circuits.
What is the main highlight of current mirror?
The main function of this amplifier is to reverse the direction of the flow of current. The main function of the current mirror is to provide active loads as well as bias currents to circuits and also used to form a more practical current source.
What does the current mirror in MOSFET do?
MOSFET- Current Mirror Explained What is Current Mirror? The current mirror is an analog circuit that senses the reference current and generates the copy or number of copies of the reference current, with the same characteristics. The replicated current is as stable as the reference current source.
How is the reference current converted to a current mirror?
Fig.3 shows a current mirror circuit using the NMOS transistor. The reference current is converted to the voltage using diode connected transistor and the same is applied between the gate and the source of the another MOSFET. The relation between the I D1 and I REF can be given by the following expression.
How is current mirror implemented in PMOS transistors?
Fig. 6 shows the implementation of current mirror using the PMOS transistors. In PMOS current mirror, the source terminals for both transistors are connected to Supply voltage Vdd. The relation between the I D1 and I REF can be given by the same expression. The only thing which needs to be ensured is that M1 should operate in the saturation region.
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.