Adaptive continuous-time filter adjustment device
First Claim
1. A semiconductor die for use in a wireless device, the semiconductor die comprising:
- a controller including a first network of elements, the first network including at least one of a plurality of parallel-coupled capacitors and a plurality of series-coupled resistors, the controller configured to generate a digital word responsive to a time constant, to iteratively compare select bits of the digital word to corresponding bits of a reference word to generate an output word, to apply the output word to the first network, each element of the first network being under switched control of a corresponding bit of the output word; and
an adaptive continuous-time filter including a control input and a second network of elements, the control input configured to receive the output word to generate a filter response, the second network being a duplicate of the first network.
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Abstract
A device includes a controller and an adaptive continuous-time filter that includes a control input and a first array of elements. The controller generates a digital word responsive to a time constant and compares a select bit of the digital word to a corresponding reference word to generate a control bit. The controller includes a duplicate array of elements, and applies the control bit to an adjustable element of the duplicate array of elements to modify the time constant. The controller provides the output word to the control input of the adaptive continuous-time filter to generate a filter response that accounts for effects of semiconductor process variation in the first array of elements.
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Citations
20 Claims
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1. A semiconductor die for use in a wireless device, the semiconductor die comprising:
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a controller including a first network of elements, the first network including at least one of a plurality of parallel-coupled capacitors and a plurality of series-coupled resistors, the controller configured to generate a digital word responsive to a time constant, to iteratively compare select bits of the digital word to corresponding bits of a reference word to generate an output word, to apply the output word to the first network, each element of the first network being under switched control of a corresponding bit of the output word; and an adaptive continuous-time filter including a control input and a second network of elements, the control input configured to receive the output word to generate a filter response, the second network being a duplicate of the first network. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method to adjust an adaptive continuous-time filter, the method comprising:
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generating a digital word responsive to a time constant; iteratively comparing select bits of the digital word to corresponding bits of a reference word to generate an output word; applying the output word to a first network of elements to modify the time constant, each element of the first network being under switched control of a corresponding bit of the output word, the first network including at least one of a plurality of parallel-coupled capacitors and a plurality of series-coupled resistors; and receiving the output word at a control input of an adaptive continuous-time filter to generate a filter response, the adaptive continuous-time filter including a second network of elements, the second network being a duplicate of the first network. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification