Range compression in oversampling analog-to-digital converters using differential input signals
AssigneeLinear Technology Corporation
InventorFlorin A. Oprescu
Life of this patent
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Abstract
An analog-to-digital converter according to the invention is provided. The analog-to-digital converter preferably includes an analog input signal, a first reference signal, a second reference signal, and a range compression signal. The range compression signal is preferably characterized by a magnitude greater than the first reference signal and smaller than the second reference signal. In addition, when the analog input signal is sampled N times and the range compression signal is sampled N1 times, a compression factor related at least in part to the ratio N1/(N+N1) is obtained.
Claims16
An analog to digital converter comprising:
- a differential analog input signal;
- a differential reference signal;
- a range compression signal comprising a magnitude that is smaller than the magnitude of the differential reference signal wherein, when the differential analog input signal is sampled N times and the range compression signal is sampled N1 times, a compression factor is obtained, wherein the compression factor is based at least in part on the ratio of N1/(N+N1).
A method of converting a differential analog input signal into a digital output signal, the method using a differential reference signal and a range compression signal, the range compression signal comprising a magnitude that is smaller than the magnitude of the differential reference signal, the method comprising:
- sampling the differential analog input signal N times;
- sampling the range compression signal N1 times;
- and
- obtaining a compression factor that is based at least in part on the ratio of N1/(N+N1).
Dependencies are inferred from the claim text.