US 6,473,014 B2 · Sampling device having an intrinsic filter

Abstract

A sampling device for sampling an input signal having intrinsic filter properties. The sampling device samples a continuous analog input signal according to a sampling signal. The sampling device includes a first sampling switch for sampling the input signal, in response to a sampling signal, to create a first set of samples. Furthermore, the sampling device incorporates a time delay device for time delaying the first set of samples. The sampling device also includes a phase shift device for phase shifting the input signal. The phase delayed input signal is then fed into a second sampling switch for sampling in response to the sampling signal to create a second set of samples. Further, a summer is incorporated to sum the first set of samples with the second set of samples to create the output samples.

Claims15

Dependent claims

A method of removing at least one aliasing image from a plurality of output samples, the method comprising:

sampling an input signal at a given sampling rate to generate a first set of samples of the input signal,
time delaying the first set up samples of the input signal, wherein the time delay is an integral multiple of the period of the sampling rate;
phase shifting the input signal and sampling the phase-shifted input signal to generate a second set of samples;
and
summing the first and second set of samples to remove at least one aliasing image.

2 more elements

A sampling system for sampling an input signal to generate a set of output samples, the sampling device comprising an intrinsic filter for removing at least one aliasing image from the output samples by interference

wherein the intrinsic filter comprises:
a time delaying sampling device for generating a time delayed set of samples of the input signal;
a phase shifting sampling device for generating a phase shifted set of samples of the input signal;
a phase and time shifting sampling device for generating a phase and time shifted set of samples of the input signal;
and
a summer for summing the time delayed set of samples with the phase shifted set of samples and the phase and time shifted set of samples to remove at least one aliasing image;
wherein the time delaying sampling device comprises:
a first sampling switch for sampling the input signal;
and
a time delay device for generating the time delayed set of samples of the input signal according to a first predetermined time delay;
wherein the phase shifting sampling device comprises:
a phase shifting device for phase shifting the input signal by a first predetermined phase shift;
and
a second sampling switch for sampling the phase shifted input signal to generate the phase shifted set of samples of the input signal;
wherein the phase and time shifting sampling device comprises:
a second phase shifting device for phase shifting the input signal by a second predetermined phase shift in:
a second sampling switch for sampling the second phase shifted input signal to generate the second phase shifted set of samples of the input signal;
and
a second time delay for time delaying the second phase shifted set of samples by a second predetermined time delay;
wherein the first predetermined time delay is equal to one sampling period of a first sampling signal for enabling first sampling switch, the second predetermined time delay is equal to two sampling periods of a second sampling signal for enabling second sampling switch, the first predetermined phase shift is equal to π radians, and the second predetermined phase shift is equal to π/2 radians.

17 more elements

Dependencies are inferred from the claim text.

Sampling device having an intrinsic filter

Life of this patent

Sampling device having an intrinsic filter

Life of this patent

Abstract

Claims15