Method and system for tuning precision continuous-time filters

Details Method and system for tuning precision continuous-time filters Method and system for tuning precision continuous-time filters

2008-12-18

2011-10-25

Raymond, Edward (Department: 2857)

Data processing: measuring, calibrating, or testing

Calibration or correction system

Circuit tuning

Reexamination Certificate

active

08046186

ABSTRACT:
Described embodiments provide a method for calibrating a continuous-time filter having at least one adjustable parameter. A square-wave signal is filtered by a continuous-time filter having a cutoff frequency less than fs. The filtered signal is quantized at the rate fs. An N-point Fourier transform is performed of the quantized signal into N real output values and N imaginary output values. At least one of the real output values are accumulated to form a real output signal and at least one of the imaginary output values are accumulated to form an imaginary output signal. The real and imaginary output signals are summed to form an output signal, which is then squared. The squared output signal is compared to a comparison value. At least one parameter of the continuous-time filter is adjusted based upon the comparison. The steps are repeated until the squared output signal is approximately the comparison value.

REFERENCES:
patent: 5608400 (1997-03-01), Pellon
patent: 2011/0095927 (2011-04-01), Pagnanelli
Stehr, et al.; Fully Differential CMOS Integrated 4th Order Reconfigurable Gm-C Lowpass Filter for Mobile Communication; Proceedings of 2003 10th IEEE International Conference on Electronics, Circuits. & Systems.; Dec. 14-17, 2003; pp. 144-147; vol. 1; USA.

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