Decimating filter

Details Decimating filter Decimating filter

1985-10-03

1987-03-24

Harkcom, Gary V.

Boots, shoes, and leggings

364724, G06G 700

Patent

active

046530177

ABSTRACT:
A decimating filter utilizing first and second switched input capacitors for sampling an input signal on opposite phases of a first sampling clock signal. The switched input capacitors are connected to an integrating circuit for filtering the sampling signal. An output of the integrating circuit is sampled according to a second sampling clock signal having a frequency equal to a submultiple of the first sampling clock signal frequency. By sampling the input signal on opposite phases, the input signal is effectively sampled at twice the first sampling clock signal frequency. Accordingly, in applications involving high sampling frequencies, such as digital signal transmission, the input signal can be sampled at a sufficiently high frequency without requiring a prohibitively high input sampling clock frequency. The decimating filter is of simple design and can be inexpensively implemented on an integrated circuit chip requiring small area.

REFERENCES:
patent: 4344149 (1982-08-01), van de Meeberg et al.
patent: 4354169 (1982-10-01), Nossek
patent: 4356464 (1982-10-01), Fettweis
patent: 4455539 (1984-06-01), Wurzburg
patent: 4584659 (1986-04-01), Stikvoort
R. Gregorian, "Filtering Techniques With Switched-Capacitor Circuits", Microelectronics Journal, vol. 11, No. 2, Mar.-Apr.-1980, pp. 13-21.
C. Rahim et al., "A Functional MOS Circuit for Achieving the Bilinear Transformation in Switched Capacitor Filters", IEEE Journal of Solid-State Circuits, vol. SC-13, No. 6, Dec. 1978, pp. 906-909.
R. Gregorian et al., "MOS Sampled-Data High-Pass Filters Using Switched-Capacitor Integrators", Microelectronics Journal, vol. 11, No. 2, Mar.-Apr. 1980, pp. 22-25.
Roubik Gregorian et al. article reprinted from IEEE Trans. Circuits Syst., vol. CAS-27, pp. 509-514, Jun. 1980; "Switched Capacitor Decimation and Interpolation Circuits".
Von Grunigen et al. Article of IEEE Journal of Solid-State Circuits, vol. SC-17, No. 6, Dec. 1982, pp. 1024-1028; "Integrated Switched-Capacitor Low-Pass Filter with Combined Anti-Aliasing Decimation Filter for Low Frequencies".

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