RF amplifier system for neutralizing internal capacitance in...

Details RF amplifier system for neutralizing internal capacitance in... RF amplifier system for neutralizing internal capacitance in...

2011-01-04

2011-01-04

Nguyen, Patricia (Department: 2817)

Amplifiers

Signal feedback

Compensating for inter-electrode impedance

C330S087000, C330S094000

Reexamination Certificate

active

07863978

ABSTRACT:
An RF amplifier system having closed cavity containing an amplifying device that includes at least a cathode, an anode and a grid and wherein the amplifying device exhibits an internal grid-to-anode capacitance. Apparatus is presented for use in neutralizing the internal capacitance. This includes a feedback circuit including an external capacitor of fixed value and a phase inverting transformer having a transformer primary winding connected in series with the capacitor to the cathode. The transformer has a secondary winding connected between the cathode and the grid for supplying a phase inverted negative feedback voltage to the grid for neutralizing the cavity by the feedback voltage. The transformer coupling is adjustable to vary the magnitude of the feedback voltage.

REFERENCES:
patent: 2235198 (1941-03-01), Buschbeck
patent: 2257570 (1941-09-01), Posthumus
patent: 3382450 (1968-05-01), Rockwell
patent: 3617915 (1971-11-01), Amemiya et al.
patent: 3835406 (1974-09-01), Thompson

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