Analog signal level detector

Details Analog signal level detector Analog signal level detector

1985-09-18

1988-01-26

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307354, 307359, 328151, H03K 5153

Patent

active

047218657

ABSTRACT:
The invention relates to a detector of the mean level of a signal particularly intended to indicate whether an expected alternating signal is absent or present. This detector uses an analog comparator, a digital counter and a converter for establishing an analog signal to be compared with the expected rectified signal. The counter content oscillates round the mean value of the rectified signal. The counter serves as a digital integrator for the sign of the difference between the input signal and the content of the counter, in such a way that on average the input signal is just as often above as below the counter content. The digital - analog conversion can take place with the aid of switched capacitors.

REFERENCES:
patent: 4200863 (1980-04-01), Hodges et al.
patent: 4204260 (1980-05-01), Nysen
patent: 4429185 (1981-01-01), Adrian et al.
patent: 4560940 (1985-12-01), van der Schans
IEE Journal of Solid State Circuits, vol. SC-10, No. 6, Dec. 1975.
Electronic Design, vol. 28, No. 2, Jan. 1980.
IBM Technical Disclosure Bulletin, vol. 25, No. 10, Mar. 1983.

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