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US 12,028,034 B2Granted
Accurate calibration of analog integrated-circuits continuous-time complex filters
AssigneeSynopsys, Inc.
InventorMohammed Tawfik Mahmoud Mohammed AbdelHafez
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Abstract
A first and second input tone are applied to a continuous-time complex filter within an integrated circuit. The magnitude of the output of the filter at the frequency of each of the first and second input tones are measured and compared to determine the value of a filter tuning control signal. A tuning control signal is applied to the filter with the determined value to tune the filter.
Claims14
A method comprising:
- applying to an input of a filter, a first tone having a first tone frequency that is less than a desired center frequency of the filter, and offset by a first offset frequency from the desired center frequency, the first offset frequency placing the first tone frequency in a lower transition band of the filter;
- applying to the input of the filter, a second tone having a frequency that is greater than, and offset by a second offset frequency from, the desired center frequency of the filter, the second offset frequency placing the frequency of the second tone in the upper transition band of the filter;
- measuring the output of the filter with the first and second tone applied to the input of the filter;
- and
- determining a value of a tuning control signal to tune the filter in response to the measured output signal from the filter.
2 more elements
Dependencies are inferred from the claim text.