Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Patent
1981-08-17
1987-02-17
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
330 9, 330107, 328151, 307521, H03H 1112, H03H 1706, H03H 1900, H03K 5135
Patent
active
046443045
ABSTRACT:
A switched capacitor pseudo-N-path filter stage includes an analog integrator circuit having an input, an output, and a feedback capacitor connected between the input and the output. A plurality of storage capacitors are connected across the feedback capacitor and an input capacitor is provided. The feedback capacitor and storage capacitors form an analog random access memory. A switching circuit selectively connects the input capacitor across electrical ground and between an input signal and the input of the integrator circuit, and also selectively connects the feedback capacitor and the storage capacitors between electrical ground and the output of the integrator circuit. In this manner, the input signal is filtered as the input capacitor samples the input signal and the charge on the input capacitor is circulated through the feedback capacitor and the storage capacitors.
REFERENCES:
patent: 4039979 (1977-08-01), Carbrey
Lee-"Parasitic-Insensitive Switched-Capacitor Ladder Filters", Electronics Letters, 5 Jun. 1980, vol. 16, No. 12; pp. 472-473.
Temes et al.-"Switched-Capacitor Filter Design using the Bilinear Z-Transform", IEEE Trans. on Circuits and Systems, vol. CAS-25, No. 12, Dec. 1978; pp. 1039-1043.
Ghaderi et al.-"Switched-Capacitor Pseudo-N-Path Filters", 1981 International Symposium on Circuits and Systems, Apr. 1981, Chicago, Illinois; 4 pages.
Allstot et al.-"A switched Capacitor N-Path Filter", Proc. of the international Symposium on Circuits and Systems, Apr. 1980; pp. 313-316.
Fettweis et al.-"A Solution to the Balancing Problem in N-Path Filters", IEEE Transactions on Circuit Theory, vol. CT-18, May 1971; pp. 403-405.
Fried-"Analog Sample-Data Filters", IEEE Journal of Solid-State Circuits, Aug. 1972; pp. 302-304.
Nussbaum Marvin L.
The Regents of the University of Calif.
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