Dither system for a quantizing device

Details Dither system for a quantizing device Dither system for a quantizing device

2005-09-27

2005-09-27

Wamsley, Patrick (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Increasing converter resolution

C348S574000

Reexamination Certificate

active

06950048

ABSTRACT:
A dither system for a quantizing device, such as a multi-stage pipelined analog-to-digital converter (ADC), derives a dither signal from a clock signal having a sample frequency, the dither signal having a frequency that is one-third of the sample frequency. The dither signal is easily converted to analog and added at the input of the quantizing device to an analog signal to be digitized. A cancellation signal circuit generates a cosine-wave signal from a digital version of the dither signal and programmable coefficients that are a function of amplitude and phase. The cosine-wave signal is combined with the digital output signal from the quantizing device to produce a corrected digital output signal having reduced quantization distortion.

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A.J.E.M. Janssen, “Fourier Analysis and Synthesis for a Mildly Non-Linear Quantizer” Philips Research Laboratories 1999, no month.

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