Why do we need to use Common-Mode Feedback Circuits ?
• In the past, circuits have mainly one input and one output and both
referred to ground.
• Low voltage power supply make single ended circuits very difficult
to perform optimally. An alternative to single-ended circuits is to
use fully differential circuits.
• To double the output swing a fully differential circuit are used.
• The output terminals of fully differential circuits are equal and
opposite polarity.
• Additional properties of fully differential circuits are: improved
output swing, linearity and common-mode rejection ratio.
• How are the differential outputs referred to ?
• How are the common-mode signals eliminated in a Fully differential
circuit ?
A comparator is designed with the specifications provided in Table I. Table II summarizes the assumptions that may be made …
Using an active load, i.e., MOSFET(s), to replace a passive load resistor can dramatically reduced the required chip area for the circuit while also helping produce much higher gains (due to the potentially high small-signal resistance an active load can provide)…
This lecture investigates different topologies (and their characteristics) that can be used to implement differential amplifiers with extremely high gain. We will again be using cascoding …
Let’s take a look the variety of design using opamp..
Operational amplifiers have been used in many electronic circuitries. As far as the performance of the circuit design is concerned, there are a quite number of op amp design parameters should be considered …
