Contents
What is common source amplifier?
In electronics, a common-source amplifier is one of three basic single-stage field-effect transistor (FET) amplifier topologies, typically used as a voltage or transconductance amplifier. The easiest way to tell if a FET is common source, common drain, or common gate is to examine where the signal enters and leaves.
Why do we use 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.
Which is an example of an active load amplifier?
The amplifier can be biased using the constant current source. The current source is the example of active load. If the current source is ideal then there are couple of advantages. Bias current remains stable irrespective of the changes in the external circuit parameters like temperature
I am reading about common source amplifier with a current-mirror active load from the book Analog Integrated Circuit Design by Tony Chan Carusone, David Johns, Kenneth Martin. I am confused by the yellow sentence below:
Which is the active component of a MOSFET amplifier?
In MOSFET amplifier circuits, instead of a passive resistor, the active component like a MOSFET or MOSFET circuit (Current Mirror) is used to increase the gain of the amplifier. This active component or the active circuit is known as the Active Load.
When to use active load in integrated circuits?
The Active Load is usually used in the integrated circuits where the size and power consumption are major constrain. Also, in the integrated circuits, fabricating a resistor requires a lot of space. And therefore, instead of a resistor, the active load is used. The active load also helps in increasing the voltage gain of the amplifier.