Offset cancelling AC level detector using an oscillator

Details Offset cancelling AC level detector using an oscillator Offset cancelling AC level detector using an oscillator

1984-10-01

1986-01-14

Grimm, Siegfried H.

Oscillators

Combined with particular output coupling network

307362, 328146, 328150, 331135, 331143, 331179, G01R 19165, H03K 3023

Patent

active

045648212

ABSTRACT:
An alternating current small-signal detector is disclosed in which an oscillator output frequency jumps from a first frequency of oscillation to a second frequency of oscillation in response to the alternating current signal exceeding a predetermined value. The predetermined value is maintained over changes in input offset voltages by a feedback network which changes only the oscillator duty cycle.

REFERENCES:
patent: 3477034 (1969-11-01), Gioia et al.
patent: 3875523 (1975-04-01), Wade et al.
patent: 4163950 (1979-08-01), Damm et al.
Ilyukovich, A. M.; "Methods of Measuring and Reproducing Small Direct Currents"; Jan. 1979; pp. 55-57; Izmeritel 'Naya Tekhnika, No. 1; Translated Plenum Publishing Corp.
Graeme, J. G.; "Designing with Operational Amplifiers"; 1977; pp. 59-63, 154-161; McGraw Hill Book Company.
Motorola; "Linear Integrated Circuits" (Handbook); 1979 pp. 7-7, through 7-10.

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