RF amplifier system for neutralizing internal capacitance in a cavity
US7863978B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 2009 |
| Grant date | Jan 4, 2011 |
| Priority date | — |
| Expiry date | Sep 11, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/541
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.