Cascaded higher order filter with low sensitivity to component v

Details Cascaded higher order filter with low sensitivity to component v Cascaded higher order filter with low sensitivity to component v

1997-06-13

1999-10-05

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

327552, 327558, H03H 102

Patent

active

059631120

ABSTRACT:
The present invention provides a higher order filter with low sensitivity to component values and to a method of designing the same. The higher order filter is constructed of second and/or third order filter circuits which have been desensitized with respect to component values and gain by impedance tapering the filter circuits. The filter circuits are impedance tapered by successively scaling the resistors and/or capacitors from left to right to minimize loading on the first filter section and to maximize the quality factor of the passive pole. The impedance of the filter sections is increased from left to right by increasing the resistor values and/or by decreasing the capacitor values from left to right. Once the lower order filter circuits have been designed, they are cascaded to provide a higher order filter with low sensitivity to component values and gain.

REFERENCES:
Moschytz, "A Universal LOW-Q Active-Filter Building Block Suitable for Hybrid-Integrated Circuit Implementation," IEEE Transactions on Circuit Theory, vol. CT-20, No. 1, pp. 37-47, Jan. 1973.
Moschytz et al. , Active Filter Design Handbook, Wiley & Sons, pp. 169-170, 1981.

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