Error reduction in switched capacitor digital-to-analog converter systems by balanced sampling
First Claim
Patent Images
1. A DAC system comprising:
- a first DAC connected and operable to sample a reference source, which provides a reference, at a first rate;
a second DAC connected and operable to sample the reference source at a second rate, the second rate being greater than the first rate; and
at least one load circuit connected and operable to sample the reference source at a third rate such that the level of the reference provided by the reference source is substantially the same each time a sample is taken.
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Abstract
A switched-capacitor DAC system includes two switched-capacitor DACs and a load circuit. The switched-capacitor filter of the first DAC samples a reference voltage source, which produces a reference voltage, at a first rate and the switched-capacitor filter of the second DAC samples the reference voltage source at a second rate, greater than the first rate. The load circuit samples the reference voltage source at a rate such that the level of the reference voltage is the same each time a sample is taken. The load circuit effectively equates the sampling of the two filters and substantially eliminates problems related to gain errors and low frequency quantization noise.
66 Citations
15 Claims
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1. A DAC system comprising:
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a first DAC connected and operable to sample a reference source, which provides a reference, at a first rate; a second DAC connected and operable to sample the reference source at a second rate, the second rate being greater than the first rate; and at least one load circuit connected and operable to sample the reference source at a third rate such that the level of the reference provided by the reference source is substantially the same each time a sample is taken. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A DAC system comprising:
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a first means for sampling a reference source, which provides a reference, at a first rate; a second means for sampling the reference source at a second rate, the second rate being greater than the first rate; and at least one circuit load means for sampling the reference source at a third rate such that the reference is at substantially the same level each time a sample is taken. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for equating reference source sampling by first and second devices which each periodically sample the reference source, which produces a reference, comprising the steps of:
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with the first device, sampling the reference source at a first rate; with the second device, sampling the reference source at a second rate; and sampling the reference source at a third rate such that the level of the refence is substantially the same each time a sample is taken.
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Specification