Monolithically integrated filter circuit

Details Monolithically integrated filter circuit Monolithically integrated filter circuit

1980-02-14

1982-03-16

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Frequency or time domain filters and delay lines utilizing...

307221D, 357 24, H03H 1706, G11C 2700, G11C 2100, G11C 1928

Patent

active

043203639

ABSTRACT:
A monolithically integrated filter circuit having low transmission losses and a high upper cutoff frequency has at least one charged transfer device with a closed loop transmission channel provided on a doped semiconductor body to which transmission channels of branch charge transfer devices are connected at predetermined nodal points. Each charge transfer device has shift electrodes arranged over an insulating layer over a limiting surface of the semiconductor body which are charged with clock voltages. Shift electrodes in the immediate proximity of a nodal point are charged with the same clock voltage but are separately allocated to different transmission channels and have a pre-determined surface area ratio with regard to each other and the sum of their surface areas is equal to the surface area of an adjacent shift electrode which is allocated to the closed loop transmission channel. The transmission channel of a branch charge transfer device at a nodal point is disposed at an angle with respect to the transmission direction of the closed loop transmission channel which is approximately 45.degree..

REFERENCES:
patent: 4267535 (1981-05-01), Betzl et al.
patent: 4268806 (1981-05-01), Betzl et al.
Sequin et al., "Charge Transfer Devices", Academic Press, Inc., New York, 1975; pp. 1-17, 48-59, and 243-245.

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