System and method for offset error compensation in comparators
First Claim
1. An analog to digital converter, comprising:
- a comparator having an offset error, a positive receptor, a negative receptor, a positive output, and a negative output;
a sequence generator operable to generate a control signal representing either a normal cycle or a swap cycle;
a first cross connect coupled to the positive receptor, the negative receptor, a positive input signal, and a negative input signal, the first cross connect operable to couple the positive input signal to the positive receptor and the negative input signal to the negative receptor in response to a normal cycle control signal from the sequence generator, the first cross connect further operable to couple the positive input signal to the negative receptor and the negative input signal to the positive receptor in response to a swap cycle control signal from the sequence generator; and
a second cross connect coupled to the positive receptor, the negative receptor, the positive output, and the negative output, the second cross connect operable to couple the positive receptor to the positive output and the negative receptor to the negative output in response to the normal cycle control signal, the second cross connect further operable to couple the positive receptor to the negative output and the negative receptor to the positive output in response to the swap cycle control signal.
1 Assignment
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Accused Products
Abstract
An offset error compensation system is provided that includes a comparator (42) having an offset error (44), a positive receptor (56), a negative receptor (58), a positive output (60), and a negative output (62). A sequence generator (14) generates control signals (22) representing normal cycles and swap cycles. A first cross connect (46) is coupled to the positive receptor (56), the negative receptor (58), a positive input signal (52), and a negative input signal (54). The first cross connect (46) couples the positive input signal (52) to the positive receptor (56) and the negative input signal (54) to the negative receptor (58) in response to a normal cycle. The first cross connect (46) further couples the positive input signal (52) to the negative receptor (58) and the negative input signal (54) to the positive receptor (56) in response to a swap cycle. A second cross connect (48) is coupled to the positive receptor (56), the negative receptor (58), the positive output (60), and the negative output (62). The second cross connect (48) couples the positive receptor (56) to the positive output (60) and the negative receptor (58) to the negative output (62) in response to the normal cycle. The second cross connect (48) further couples the positive receptor (56) to the negative output (62) and the negative receptor (58) to the positive output (60) in response the swap cycle.
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Citations
11 Claims
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1. An analog to digital converter, comprising:
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a comparator having an offset error, a positive receptor, a negative receptor, a positive output, and a negative output;
a sequence generator operable to generate a control signal representing either a normal cycle or a swap cycle;
a first cross connect coupled to the positive receptor, the negative receptor, a positive input signal, and a negative input signal, the first cross connect operable to couple the positive input signal to the positive receptor and the negative input signal to the negative receptor in response to a normal cycle control signal from the sequence generator, the first cross connect further operable to couple the positive input signal to the negative receptor and the negative input signal to the positive receptor in response to a swap cycle control signal from the sequence generator; and
a second cross connect coupled to the positive receptor, the negative receptor, the positive output, and the negative output, the second cross connect operable to couple the positive receptor to the positive output and the negative receptor to the negative output in response to the normal cycle control signal, the second cross connect further operable to couple the positive receptor to the negative output and the negative receptor to the positive output in response to the swap cycle control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An analog-to-digital convertor, comprising:
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a plurality of comparators, each comparator having an offset error, a positive receptor, a negative receptor, a positive output, and a negative output;
a sequence generator operable to generate a control signal representing either a normal cycle or a swap cycle;
a plurality of first cross connects, each first cross connect coupled to the positive receptor and the negative receptor of one of the plurality of comparators, each first cross connect further coupled to a positive input signal and a negative input signal, each first cross connect operable to couple the positive input signal to the associated positive receptor and the negative input signal to the associated negative receptor in response to a normal cycle control signal generated by the sequence generator, each first cross connect further operable to couple the positive input signal to the associated negative receptor and the negative input signal to the associated positive receptor in response to a swap cycle control signal generated by the sequence generator; and
a plurality of second cross connects, each second cross connect coupled to the positive receptor, the negative receptor, the positive output, and the negative output of one of the plurality of comparators, each second cross connect operable to couple the positive receptor to the positive output and the negative receptor to the negative output in response to the normal cycle control signal, each second cross connect further operable to couple the positive receptor to the negative output and the negative receptor to the positive output in response to the swap cycle control signal.
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Specification