Integrated switched-capacitor filter with improved frequency cha

Details Integrated switched-capacitor filter with improved frequency cha Integrated switched-capacitor filter with improved frequency cha

1987-10-15

1988-09-06

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307520, 333173, 328151, H03H 1900, H03K 500

Patent

active

047696125

ABSTRACT:
A switched-capacitor filter constituted in the form of a semiconductor integrated circuit has an input circuit which consists of at least one noninversion-type switched-capacitor and at least two inversion-type switched-capacitors that are connected in parallel with each other. The two inversion-type switched-capacitors have different writing timings and reading timings relative to each other. With this setup, capacitances of the switched-capacitors need not be extremely increased even when it is desired to maintain a zero-point frequency of the filter at a very low value. Further, there is no need of providing a circuit such as sample holding circuit which requires extra area and consumes additional electric power.

REFERENCES:
Mohan et al., "General Stray-Insensitive First-Order Active Network," Elec. Letters, 1-7-82, vol. 18, No. 1, pp. 1-2.

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