Level detecting circuit

Details Level detecting circuit Level detecting circuit

1981-11-27

1984-02-21

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307359, 307492, 307542, 328145, H03K 508

Patent

active

044332548

ABSTRACT:
A level detecting circuit for producing a level detected output signal in response to an input signal includes a logarithmic converting amplifier which logarithmically converts the input signal into a logarithmically converted signal; a differential error amplifier which produces a logarithmically amplified signal in response to the logarithmically converted signal and at least one feedback signal; an integrating capacitor supplied with the logarithmically amplified signal through a PN junction for producing an integrated signal; a voltage dividing circuit for voltage dividing the integrated signal and the logarithmically amplified signal in accordance with a selected ratio and supplying at least one resultant voltage divided signal as the at least one feedback signal to the differential error amplifier; and an output PN junction for producing the level detected output signal in response to the integrated signal.

REFERENCES:
patent: 3657528 (1972-04-01), Plante

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