Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1982-02-16
1984-12-25
Grimm, Siegfried H.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329178, 329203, 329204, 329206, 307354, 455337, H03D 106, H03D 110
Patent
active
044906811
ABSTRACT:
A signal level detector including a diode envelope detector has a characteristic having both square-law and linear-law ranges separated by an intermediate transition range of variable-law operation. The detector is provided with circuits (38, 47, 48) to extend the linear-law range of the characteristic to overlap at least a part of the variable-law transition range. A circuit (66) is provided to detect operation through an input signal level transition point between said square-law range and the extended linear-law range for automatically modifying (39) the level detector circuit so that the voltage output thereof is continuously indicative of input power level through all of said ranges.
REFERENCES:
patent: 3241079 (1966-03-01), Snell, Jr.
patent: 3408582 (1968-10-01), Britton, Jr.
patent: 4000472 (1976-12-01), Eastland et al.
Turner, R. J. "Schottky Diode Pair Makes an RF Detector Stable", Electronics, (May 2, 1974), pp. 94-95.
Clarke, K. K. et al., Communication Circuits: Analysis and Design, Addison Wesley Publishing Company, Reading, Mass., 1971, pp. 498-500.
AT&T Bell Laboratories
Grimm Siegfried H.
Mis David C.
Phelan C. S.
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