High-pass filter of the first order and application thereof to t

Details High-pass filter of the first order and application thereof to t High-pass filter of the first order and application thereof to t

1983-01-10

1985-06-18

Smith, Jerry

Boots, shoes, and leggings

364861, 330107, 333173, G06G 700, H03H 1700, H04B 1202

Patent

active

045244251

ABSTRACT:
A sampled first order high pass filter having a configuration that eliminates the output offset voltage normally associated with known filters of this general type. It is constructed according to the diagram of the accompanying figure with two operational amplifiers, four capacitors and eight switches actuated at each period in two separate phases a and b. The filter is particularly useful in digital telephone transmission. The filter is placed just up-stream of an analog-digital converter sampled at the same frequency as the filter and the second amplifier serves as a comparator for conversion outside the phases a and b.

REFERENCES:
patent: 4179665 (1979-12-01), Gregorian
patent: 4210872 (1980-07-01), Gregorian
patent: 4405899 (1983-09-01), Wurzburg
patent: 4455539 (1984-06-01), Wurzburg
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.
Gregorian et al., "CMOS Switched-Capacitor Filters for a PCM Voice CODEC", IEEE Journal of Solid-State Circuits, vol. SC-14, No. 6, Dec. 1979, pp. 970-980.
Haque et al., "A Two Chip PCM Voice CODEC With Filters", IEEE Journal of Solid-State Circuits, vol. SC-14, No. 6, Dec. 1979, pp. 961-969.

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