Correlated Double Sampling
Encyclopedia
Correlated Double Sampling(CDS) is a technique for measuring electrical values such as voltage
s or currents
that allows for removal of an undesired offset. It is used quite frequently when measuring sensor outputs. The output of the sensor is measured twice: once in a known condition and once in an unknown condition. The value measured from the known condition is then subtracted from the unknown condition to generate a value with a known relation to the physical quantity being measured.
This is commonly used in switched capacitor
operational amplifiers to effectively double the gain of the charge sharing opamp (while adding an extra phase).
Voltage
Voltage, otherwise known as electrical potential difference or electric tension is the difference in electric potential between two points — or the difference in electric potential energy per unit charge between two points...
s or currents
Electric current
Electric current is a flow of electric charge through a medium.This charge is typically carried by moving electrons in a conductor such as wire...
that allows for removal of an undesired offset. It is used quite frequently when measuring sensor outputs. The output of the sensor is measured twice: once in a known condition and once in an unknown condition. The value measured from the known condition is then subtracted from the unknown condition to generate a value with a known relation to the physical quantity being measured.
This is commonly used in switched capacitor
Switched capacitor
A switched capacitor is an electronic circuit element used for discrete time signal processing. It works by moving charges into and out of capacitors when switches are opened and closed. Usually, non-overlapping signals are used to control the switches, so that not all switches are closed...
operational amplifiers to effectively double the gain of the charge sharing opamp (while adding an extra phase).