Amplifiers – Signal feedback – Phase shift means in loop path
Patent
1979-04-02
1981-02-24
Mullins, James B.
Amplifiers
Signal feedback
Phase shift means in loop path
330109, H03F 134
Patent
active
042530695
ABSTRACT:
An active filter circuit has a biquadratic transfer function and is constructed without coils with the smallest possible number of passive components, particularly capacitors, and comprises a single operational amplifier. A first resistor is connected from the filter input to the non-inverting input of an operational amplifier and a second resistor connects the same input of the operational amplifier to a reference potential. A third resistor is connected between the output of the operational amplifier and the non-inverting input. A first capacitor is connected from the output of the operational amplifier to the inverting input and the same input is connected, by way of a fourth resistor to the reference potential for representation of a low-pass transfer function and a fifth resistor is connected between the input of the filter and the inverting input of the operational amplifier for representing a high-pass transfer function. In addition, a sixth resistor connects the inverting input of the operational amplifier to a junction which is connected to the output of the filter by way of a seventh resistor and to the reference potential by way of an eighth resistor. A second capacitor also connects the filter input to the aforementioned junction. The reference potential is connected to a line extending through the filter and forming one terminal of a pair of input terminals and one terminal of a pair of output terminals. The circuit can be constructed, in particular, in layer technology and is suited as a selection device, particularly in the low-frequency range in communications systems.
REFERENCES:
patent: 3919658 (1975-11-01), Friend
patent: 3946328 (1976-03-01), Boctor
patent: 4015224 (1977-03-01), Benzinger
patent: 4132966 (1979-01-01), Hilberman
Mullins James B.
Siemens Aktiengesellschaft
LandOfFree
Filter circuit having a biquadratic transfer function does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Filter circuit having a biquadratic transfer function, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Filter circuit having a biquadratic transfer function will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1411893