Signal strength detector

Details Signal strength detector Signal strength detector

1984-08-31

1986-10-28

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307358, 307362, 324131, 330 2, 455226, H03K 524, G01R 19165

Patent

active

046201149

ABSTRACT:
A signal strength detector comprises first, second and third transistors of the same conductivity type. The emitter electrodes of each transistor are connected together and coupled with one of a pair of dc supply lines. The collector electrodes of the first and second transistors are each coupled with the other of the pair of dc supply lines. The base electrode of the first and second transistors are each coupled via a resistor to the base electrode of the third transistor. The collector electrode of the third transistor is effective to provide a source of output current which is representative of a differential signal level between the base electrodes of the first and second transistors.

REFERENCES:
patent: 4309656 (1982-01-01), Okanobu
patent: 4513209 (1985-04-01), Tanabe et al.

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