Back to results
US 6,924,757 B2Granted
Sigma-delta modulator with reduced switching rate for use in class-D amplification
AssigneeAnalog Devices, Inc.
InventorsRobert W. Adams, David Hossack, Eric Gaalaas
Life of this patent
Estimating the term…
Abstract
A sigma delta modulator includes a modulator module that includes a quantizer with variable hysteresis, which receives an input signal to perform necessary modulation operations. A non-linear mapping module receives a signal associated with said input signal and tabulates the necessary hysteresis control information so as to reduce the transition rate of the modulator module.
Claims24
A sigma delta modulator comprising:
- a modulator module including a quantizer with variable hysteresis that receives an input signal to perform necessary modulation operations;
- and
- a non-linear mapping module that receives a signal associated with said input signal and tabulates the necessary hysteresis control information so as to reduce the transition rate of said modulator module.
A method of sigma delta modulation comprising:
- providing a modulator module including a quantizer with variable hysteresis that receives an input signal to perform necessary modulation operations;
- and
- utilizing a non-linear mapping module that receives a signal associated with said input signal and tabulates the necessary hysteresis control information so as to reduce the transition rate of said modulator module.
Dependencies are inferred from the claim text.