Electronic filter circuit

Details Electronic filter circuit Electronic filter circuit

1975-11-03

1978-03-07

Mullins, James B.

Amplifiers

Signal feedback

Phase shift means in loop path

330109, H03F 134

Patent

active

040782050

ABSTRACT:
To eliminate the high frequency portion of an input signal while permitting low frequency and DC portions to pass, the electronic filter utilizes an n-1 order active network in combination with a capacitor to generate a shunt current, thereby providing a low pass filter having n-order operating characteristics. Included in the active network is an active element, such as an operational amplifier, which responds to an input signal by creating a voltage across the capacitor, resulting in a shunt current that in turn provides the desired filter characteristics. In certain special cases the n-order active filter can utilize a differentiating element in combination with n-2 order active network along with the capacitor to achieve n-order operating characteristics.

REFERENCES:
patent: 3564441 (1971-02-01), Eide
patent: 3702405 (1972-11-01), Zwirn et al.
patent: 3886469 (1975-05-01), Rollett et al.
patent: 3895309 (1975-07-01), Rollett et al.

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