Method and apparatus for tuning high Q bandpass filters using pu

Details Method and apparatus for tuning high Q bandpass filters using pu Method and apparatus for tuning high Q bandpass filters using pu

1997-08-13

1999-08-31

Bettendorf, Justin P.

Wave transmission lines and networks

Automatically controlled systems

333174, 455125, H03H 1104

Patent

active

059458895

ABSTRACT:
A high Q bandpass filter (102) is tuned by applying a transient (204) to the filter to cause it to ring. The ringing of the filter produces an output damped oscillatory waveform (206) whose zero crossings (208) are converted to a pulse train (210) and counted in a digital counter (112) to a predetermined number n. The output (214) of the counter is compared to an accurate timing signal (216) which has a time duration equal to the time of n pulses when the filter is accurately tuned. The output of the comparator (118) is applied to an integrator (122) to generate a control signal V.sub.c to tune the filter. The high frequency tuning problem is thus converted to a low frequency, time domain problem which is readily implemented.

REFERENCES:
patent: 4091236 (1978-05-01), Chen
patent: 5200716 (1993-04-01), Amano
patent: 5227743 (1993-07-01), Yamamoto
Donald R.J. White "A Handbook on Electrical Filters, Synthesis, Design and Applications," Fourth printing 1976, pp. 1-7.

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