Filter circuit

Details Filter circuit Filter circuit

1979-12-04

1981-12-01

Mullins, James B.

Amplifiers

Signal feedback

Phase shift means in loop path

330109, 330151, H03F 134

Patent

active

043038891

ABSTRACT:
A filter circuit comprises an inverting amplifier, a first resistor connected between an input and output of the filter circuit, a second resistor connected between the input of filter circuit and an input of the inverting amplifier, a parallel combination of a third resistor and capacitor which is connected between the input and output of inverting amplifier, and a fourth resistor connected between the output of inverting amplifier and the output of filter circuit. The resistance values R.sub.1 to R.sub.4 of the first to fourth resistors are selected such that R.sub.1 .multidot.R.sub.3 =R.sub.2 .multidot.R.sub.4, with the result that a DC component is blocked. The capacitance value of the capacitor connected in parallel with the third resistor may be small provided that the resistance value of the third resistor is large. The third resistor and capacitor define the low cutoff frequency of the filter circuit.

REFERENCES:
Natarajan et al., Realisation of Transfer Function Using One Amplifier, Sep. 18, 1969, pp. 458-460, Electronics Letters, vol. 5, No. 19.
Brandt, Active Resonators Save Steps in Designing Active Filters, Apr. 24, 1972, pp. 106-110, Electronics.

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