Delta-sigma sample and hold

Details Delta-sigma sample and hold Delta-sigma sample and hold

2000-03-16

2001-12-04

Tran, Toan (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

C327S094000

Reexamination Certificate

active

06326818

ABSTRACT:

TECHNICAL FIELD
This disclosure generally relates to electronic systems and more particularly, to the design of high linearity sample-and hold circuitry.
BACKGROUND
Some sample and hold (S/H) circuitry utilizes switched capacitors. The opening and closing of switches produces nonlinear charge injection effects. These nonlinear charge injection effects can be a problem in the design of high linearity sample-and hold circuitry. Careful control over impedances seen by the sampling switches are often needed. However, careful control over impedances can be difficult to maintain due to variations in common-mode voltages and other parameters such as over process and temperature extremes.
A method and apparatus for performing voltage-mode sample and hold functions with high linearity is desired.
SUMMARY
This disclosure provides a method and apparatus for performing voltage-mode sample and hold functions while avoiding nonlinear charge injection. The method comprises oversampling an input signal and sampling an error signal, not the input signal directly, and through signal processing causing the error signal to be reduced to low amplitude. First order and higher order voltage-mode sample and hold circuitry embodiments are provided.


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