YouTuber Aaron Danner has discussed biasing transistors with current sources in his 29th video of the Transistors Series.
Replacing bias resistors with current sources can offer various advantages, such as eliminating capacitors, which are expensive to integrate and are of low quality, and preventing bias resistors from reducing gain.
Current sources are also advantageous as they can vary the voltage to compensate for changes in load resistance.
The current source demonstrated by Danner is the current mirror.
Current mirrors are a circuit design that mirrors or duplicates a current resulting in an accurate and stable current source.
It operates on the principle of electromigration briefly described as the transport of atoms within a metal conductor due to momentum transfer from conduction electrons.
