Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1985-03-25
1987-01-06
Grimm, Siegfried H.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329138, 329142, 329204, 455214, H03D 310
Patent
active
046349910
ABSTRACT:
A ratio discriminator is disclosed which can provide an exact indication of the achievement of tuning and is unaffected by drifts and variations in the components or supply or reference voltages. The discriminator includes a modulated signal input, an intermediate frequency circuit comprising first and second inductively coupled tuned oscillating circuits, wherein the first circuit is connected to the input and the second oscillating circuit has a secondary winding equipped with an intermediate tap connected to a first terminal of a tertiary winding; and a detector circuit coupled to the second oscillating circuit and having an output terminal. The tertiary winding is at a reference DC voltage, at a second terminal thereof, and connected with its first terminal to the output terminal.
REFERENCES:
patent: 3525943 (1970-08-01), Riuderle
Grimm Siegfried H.
Josif Albert
Modiano Guido
SGS-ATES Componenti Elettronici S.p.A.
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