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US 2022/0321105 A1Published application
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.
Claims20
A method comprising:
- applying to the 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
A system comprising:
- a tunable filter having an filter input port, a filter output port and a tuning control input port;
- a digital to analog converter (DAC) having a DAC input port and a DAC output port, the DAC output port coupled to the filter input port;
- an analog to digital converter (ADC) having an ADC input port and an ADC output port, the ADC output port coupled to the filter output port;
- and
- a digital calibration module having a DCM output port coupled to the DAC input port, a DCM input port coupled to the ADC output port and a tuning control output port coupled to the tuning control input port;
- wherein the digital calibration module outputs a first tone at a first frequency and second tone at a second frequency to the DAC input port and wherein the digital calibration module receives digitized filter outputs that have been digitized by the ADC, the digital calibration module outputs a tuning control signal, the tuning control signal representing a tuning control value determined in response to relative energy levels of the digitized filter outputs received by the digital calibration module.
3 more elements
Dependencies are inferred from the claim text.