Differential cmos amplifier experiment conclusion
Answers
differential amplifier reduces noise by cancellation technique and extracts the useful
information for amplification purposes. this is the reason that mostly it is used as the first
stage amplifier.
• The differential gain is actually the amplification done on the the difference of the input given
to the first transistor and second transistor.
• Single ended gain is the gain calculated from output over the input of the single transistor.
• Differential gain stage is usually followed single stage amplifier to amplify and stabilize the
overall output signal and to increase further the gain of the total amplifier.
• The current mirror is usually used in combination with the differential amplifier to affect
the bias so that the transistors operate in active mode. The referencing current is produced
outside the chip usually and then this current is mirrored all over the chip for biasing circuit
purposes. The basic current biasing can be understood by the just imagining that if a castle
has a gate and a army(current) is passing through. Then while the army is passing, the gate
keeper cannot close the gate of the castle.
• The lower terminals of the active device are joined together and are connected to a current
source for forcing the bias on the transistors to work in active mode.
•
7 Team Dynamics
Part and Member Weight Grade Muhammad Obaidullah Bilal Arshad