Active filter

Details Active filter Active filter

1979-10-23

1981-06-23

Mullins, James B.

Amplifiers

Signal feedback

Phase shift means in loop path

330109, H03F 134

Patent

active

042753570

ABSTRACT:
An active filter includes two differential amplifiers. The first amplifier has its inverting input connected to an input terminal of the active filter, its non-inverting input connected to ground through a resistor. A resistor and a capacitor are connected in parallel between the inverting input and output of the first amplifier. The second amplifier has its non-inverting input connected through a resistor to the output of the first differential amplifier and also through a capacitor to ground, its inverting input connected through a resistor to ground and also through a capacitor to its output. A resistor is connected between output of the second amplifier and the inverting input of the first amplifier.

REFERENCES:
Salerno, "Active Filters: Part 7 Analog Blocks Ensure Stable Design", Electronics, Feb. 17, 1969, pp. 100-105.

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