Circuits and methods for calibrating a frequency response of...

Coded data generation or conversion – Converter calibration or testing

Reexamination Certificate

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C341S155000

Reexamination Certificate

active

07932844

ABSTRACT:
In one embodiment, the present invention includes an integrated circuit comprising a radio frequency communication channel having a mixer and a programmable analog filter coupled to an output terminal of the mixer. The integrated circuit further comprises a digital-to-analog converter providing an AC signal to the digitally programmable analog filter, an analog-to-digital converter (ADC) coupled to an output terminal of the digitally programmable analog filter, and a digital calibration circuit that adjusts the filter frequency according to measurements calculated from the data from the ADC. During a first calibration phase, the filter frequency is adjusted to a first frequency and a first signal is measured. During a second calibration phase, the filter frequency is adjusted to a second frequency approximately equal to a frequency of the AC signal, and a second signal is measured. The filter frequency is further adjusted based on measured values of the first and second signals.

REFERENCES:
patent: 6983136 (2006-01-01), Mason et al.
patent: 7515078 (2009-04-01), May

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