Coupling filter, especially an input filter, for receivers of ce

Details Coupling filter, especially an input filter, for receivers of ce Coupling filter, especially an input filter, for receivers of ce

1983-02-01

1985-11-05

Mullins, James B.

Amplifiers

Signal feedback

In cascade amplifiers

330107, 330109, 330167, H03F 134

Patent

active

045516863

ABSTRACT:
A coupling filter is formed from a plurality of four terminal networks. Each active four terminal network preferably has a bypass admittance, two filter admittances, a feedback admittance, and an amplifier. One end of the bypass admittance and of the filter admittances are connected to each other and to the input of the four terminal network, and one end of the feedback admittance is connected to the other end of the first filter admittance and to the input of the amplifier. The remaining ends of the second filter admittance and of the feedback admittance, as well as the output of the amplifier, are connected to each other and to the output of the four terminal network. Thus, except for the first four terminal network and the last four terminal network, the input of each four terminal network is connected by way of a coupling admittance to the output of the preceding four terminal network and said input is connected by way of a second coupling admittance to the output of the following four terminal network. Also the output of each four terminal network is connected on the one hand by way of a coupling admittance to the input of the preceding four terminal network and on the other hand by way of a second coupling admittance to the input of the following four terminal network.

REFERENCES:
patent: 3461398 (1969-08-01), Gammel
patent: 4015224 (1977-03-01), Benzinger
Girling et al., "Active Filters: 7. The Two-Integrator Loop", Wireless World, Feb. 1970, pp. 76-80.
Sedra et al., "Optimum Configurations for Single-Amplifier Biquadratic Filters", IEEE Transactions on Circuits and Systems, vol. CAS-27, No. 12, Dec. 1980, pp. 1155-1163.
Perry, "New Multiple Feedback Active RC Network", Electronics Letters, vol. 11, No. 16, pp. 364-365, Aug. 7, 1975.
Taschenbuch Elektrotechnik, vol. 2, Informatik (Data Processing) by E. Philippow, Hanser Verlag, Munich and Vienna, 1977, p. 556.

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