Ratio discriminator
AssigneeSGS-ATES Componenti Elettronici S.p.A.
InventorEttore Mastrojeni
Life of this patent
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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.
Claims7
A ratio discriminator comprising a modulated signal input;
- an intermediate frequency circuit formed of first and second inductively coupled tuned oscillating circuits, said first oscillating circuit being connected to said modulated signal input and said second oscillating circuit having a secondary winding provided with an intermediate tap;
- a tertiary winding having first and second terminals;
- said first terminal of said tertiary winding being connected to said secondary winding intermediate tap;
- and a detector circuit coupled to said second oscillating circuit and having an output terminal;
- a voltage divider coupled to said tertiary winding, connected to a supply voltage and having an intermediate terminal, wherein said second terminal of said tertiary winding is connected to said intermediate terminal of said voltage divider, said second terminal being also connected to ground through a capacitor and said first terminal of said tertiary winding being connected to said detector output terminal through a resistor having a high resistance value.
Dependencies are inferred from the claim text.