Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Patent
1984-02-13
1985-12-24
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
330109, 330294, 330302, 333167, 357 51, H03H 1108, H03H 706
Patent
active
045609632
ABSTRACT:
An RC active filter device which is implemented with integrated circuit technology. Each RC filter element of the device has a distributed series resistance and a distributed shunt capacitance. The series resistance is formed by a strip of resistive material which overlies a resistive plate (or substrate) with an intervening insulating layer to form the shunt capacitance. The filter device can be designed to have a pass-band ripple response which is not affected by variation in nominal absolute resistance and capacitance values resulting from process spreads. These variations only stretch or compress the filter response along the frequency axis. The filter device comprises three RC filter elements and an operational amplifier. The RC filter elements nearest the operational amplifier determine a low pass band, while the input filter element prevents high frequency components outside the low pass band being leaked directly to the filter device output.
REFERENCES:
patent: 3564441 (1971-02-01), Eide
patent: 3569872 (1971-03-01), Berlin
patent: 3605032 (1971-09-01), Kerwin
patent: 4302737 (1981-11-01), Kausche et al.
patent: 4399417 (1983-08-01), Ballantyne et al.
Hanneman--"Higher-Order RC-Active Filters", Philips Res. Repts 26(R752), 1971; pp. 65-74.
Leppavuori et al.--"Thick Film Distributed RC-Networks for Practical Use", Conference Proc. of the 29th Electronic Components Conference, Cherry Hill, N.J., USA (May 14-16, 1979); pp. 402-406.
Glasford--"Design Aspects and Performance Limitations of Amplifier Isolated Active R-C Filters", Conference Record of the Twelfth Asilomar Conference on Circuits, Systems and Computers, Pacific Grove, CA, USA (Nov. 6-8, 1978); pp. 44-48.
Biren Steven R.
Mayer Robert T.
Nussbaum Marvin L.
U.S. Philips Corporation
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