Filter with adjustable edge steepness

Details Filter with adjustable edge steepness Filter with adjustable edge steepness

1992-07-23

1993-07-20

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

330126, 330151, 330306, 381 98, H03F 3181

Patent

active

052297349

ABSTRACT:
A filter with adjustable edge steepness includes input terminals for applying a signal to be filtered. One of the input terminals is connected to a reference potential. A signal-forming device is connected to the input terminals for forming a first signal and a second signal from the signal to be filtered. The signal-forming device adjusts a difference between the first signal and the second signal. A subtraction device is connected to the signal-forming device for forming a differential signal from the first signal and the second signal. A frequency-dependent device has an input terminal connected to the subtraction device, an output terminal for supplying another signal, and a filter transfer characteristic to be delivered to the differential signal. An addition device has an output and is connected to the signal-forming device and to the output terminal of the frequency-dependent device for forming a summation signal at the output from the first signal and the other signal. One output terminal is connected to the output of the addition device and another output terminal is connected to the reference potential.

REFERENCES:
patent: 4280102 (1981-07-01), Yokoyama
patent: 4996497 (1991-02-01), Waehner
"Electronique et Applications Industrielles" pp. 14 and 15 No. 257, Oct. 1978.
Siemens Aktiengesellschaft, 1983, pp. 142-145; Horst Pelka et al: "Analoge und Digitale IS".

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